Question 1 of 8
HINT: We cover this in Lecture 1 (Summary Statistics and Graphs)
Data were collected on the number of passengers at each train station in Melbourne. The numbers for the weekday peak time, 7am to 9:29am, are given below.
456 1189 410 318 648 399 382 248 379 1240 2268 272
267 1113 733 262 682 906 338 1750 530 1584 7729 323
1311 1632 1606 982 878 169 583 548 429 658 344 2630
538 494 1946 268 435 862 866 579 1359 1022 1618 1021
401 1181 1178 637 2830 1000 2958 962 697 401 1442 1115
Tasks:
Question 2 of 8
HINT: We cover this in Lecture 2 (Measures of Variability and Association)
You are the manager of the supermarket on the ground floor below Holmes. You are wondering if there is a relation between the number of students attending class at Holmes each day, and the amount of chocolate bars sold. That is, do you sell more chocolate bars when there are a lot of Holmes students around, and less when Holmes is quiet? If there is a relationship, you might want to keep less chocolate bars in stock when Holmes is closed over the upcoming holiday. With the help of the campus manager, you have compiled the following list covering 7 weeks:
Weekly attendance Number of chocolate bars sold
472 6 916
413 5 884
503 7 223
612 8 158
399 6 014
538 7 209
455 6 214
Tasks:
Question 3 of 8
HINT: We cover this in Lecture 3 (Linear Regression)
(We are using the same data set we used in Question 2)
You are the manager of the supermarket on the ground floor below Holmes. You are wondering if there is a relation between the number of students attending class at Holmes each day, and the amount of chocolate bars sold. That is, do you sell more chocolate bars when there are a lot of Holmes students around, and less when Holmes is quiet? If there is a relationship, you might want to keep less chocolate bars in stock when Holmes is closed over the upcoming holiday. With the help of the campus manager, you have compiled the following list covering 7 weeks:
Weekly attendance Number of chocolate bars sold
472 6 916
413 5 884
503 7 223
612 8 158
399 6 014
538 7 209
455 6 214
Tasks:
(Hint 1  As manager, which variable do you think is the one that affects the other variable? In other words, which one is independent, and which variable’s value is dependent on the other variable? The independent variable is always x.
Hint 2 – When you interpret the equation, give specific examples. What happens when Holmes are closed? What happens when 10 extra students show up?)
Question 4 of 8
HINT: We cover this in Lecture 4 (Probability)
You are the manager of the Holmes Hounds Big Bash League cricket team. Some of your players are recruited inhouse (that is, from the Holmes students) and some are bribed to come over from other teams. You have 2 coaches. One believes in scientific training in computerised gyms, and the other in “grassroots” training such as practising at the local park with the neighbourhood kids or swimming and surfing at Main Beach for 2 hours in the mornings for fitness. The table below was compiled:

Scientific training 
Grassroots training 
Recruited from Holmes students 
35

92 
External recruitment 
54

12 
Tasks (show all your workings):
Question 5 of 8
HINT: We cover this in Lecture 5 (Bayes’ Rule)
A company is considering launching one of 3 new products: product X, Product Y or Product Z, for its existing market. Prior market research suggest that this market is made up of 4 consumer segments: segment A, representing 55% of consumers, is primarily interested in the functionality of products; segment B, representing 30% of consumers, is extremely price sensitive; and segment C representing 10% of consumers is primarily interested in the appearance and style of products. The final 5% of the customers (segment D) are fashion conscious and only buy products endorsed by celebrities.
To be more certain about which product to launch and how it will be received by each segment, market research is conducted. It reveals the following new information.
Tasks (show your workings):
Question 6 of 8
HINT: We cover this in Lecture 6
You manage a luxury department store in a busy shopping centre. You have extremely high foot traffic (people coming through your doors), but you are worried about the low rate of conversion into sales. That is, most people only seem to look, and few actually buy anything.
You determine that only 1 in 10 customers make a purchase. (Hint: The probability that the customer will buy is 1/10.)
Tasks (show your workings):
On average you have 4 people entering your store every minute during the quiet 1011am slot. You need at least 6 staff members to help that many customers but usually have 7 staff on roster during that time slot. The 7^{th} staff member rang to let you know he will be 2 minutes late. What is the probability 9 people will enter the store in the next 2 minutes? (Hint 1: It is a Poisson distribution. Hint 2: What is the average number of customers entering every 2 minutes? Remember to show all your workings.)
Question 7 of 8
HINT: We cover this in Lecture 7
You are an investment manager for a hedge fund. There are currently a lot of rumours going around about the “hot” property market on the Gold Coast, and some of your investors want you to set up a fund specialising in Surfers Paradise apartments.
You do some research and discover that the average Surfers Paradise apartment currently sells for $1.1 million. But there are huge price differences between newer apartments and the older ones left over from the 1980’s boom. This means prices can vary a lot from apartment to apartment. Based on sales over the last 12 months, you calculate the standard deviation to be $385 000.
There is an apartment up for auction this Saturday, and you decide to attend the auction.
Tasks (show your workings):
Question 8 of 8
HINT: We cover this in Lecture 8
You are an investment manager for a hedge fund. There are currently a lot of rumours going around about the “hot” property market on the Gold Coast, and some of your investors want you to set up a fund specialising in Surfers Paradise apartments.
Last Saturday you attended an auction to get “a feel” for the local real estate market. You decide it might be worth further investigating. You ask one of your interns to take a quick sample of 50 properties that have been sold during the last few months. Your previous research indicated an average price of $1.1 million but the average price of your assistant’s sample was only $950 000.
However, the standard deviation for her research was the same as yours at $385 000.
Tasks (show your workings):
HINT: We cover this in Lecture 1 (Summary Statistics and Graphs)
Data were collected on the number of passengers at each train station in Melbourne. The numbers for the weekday peak time, 7am to 9:29am, are given below.
456 1189 410 318 648 399 382 248 379 1240 2268 272
267 1113 733 262 682 906 338 1750 530 1584 7729 323
1311 1632 1606 982 878 169 583 548 429 658 344 2630
538 494 1946 268 435 862 866 579 1359 1022 1618 1021
401 1181 1178 637 2830 1000 2958 962 697 401 1442 1115
Tasks:

Midpoint 
Frequency 
Relative frequency 
Cumulative relative frequency 
100299 
199.5 
6 
0.098 
0.098 
300499 
399.5 
14 
0.230 
0.328 
500999 
749.5 
17 
0.279 
0.607 
10001999 
1499.5 
18 
0.295 
0.902 
20002999 
2499.5 
4 
0.066 
0.967 
30003999 
3499.5 
0 
0.000 
0.967 
40004999 
4499.5 
0 
0.000 
0.967 
50005999 
5499.5 
0 
0.000 
0.967 
60006999 
6499.5 
1 
0.016 
0.984 
70007999 
7499.5 
1 
0.016 
1.000 
number of passengers 



Mean 
1033.433 
Median 
715 
Mode 
401 
Question 2 of 8
HINT: We cover this in Lecture 2 (Measures of Variability and Association)
You are the manager of the supermarket on the ground floor below Holmes. You are wondering if there is a relation between the number of students attending class at Holmes each day, and the amount of chocolate bars sold. That is, do you sell more chocolate bars when there are a lot of Holmes students around, and less when Holmes is quiet? If there is a relationship, you might want to keep less chocolate bars in stock when Holmes is closed over the upcoming holiday. With the help of the campus manager, you have compiled the following list covering 7 weeks:
Weekly attendance Number of chocolate bars sold
472 6 916
413 5 884
503 7 223
612 8 158
399 6 014
538 7 209
455 6 214
Tasks:
This is a sample since it is covering a portion of the period. A population covers the entire period.
x 


472 
13 
158.041 
413 
72 
5122.469 
503 
18 
339.612 
612 
127 
16238.041 
399 
86 
7322.469 
538 
53 
2854.612 
455 
30 
874.469 
3392 
0 
32910 
The correlation coefficient is 0.968; this means that a very strong positive linear relationship exists between weekly attendance and number of chocolates sold. Based on this information, as a manager I would try to see on ways of increasing the weekly attendance through attractive events in order to increase on sales.
Question 3 of 8
HINT: We cover this in Lecture 3 (Linear Regression)
(We are using the same data set we used in Question 2)
You are the manager of the supermarket on the ground floor below Holmes. You are wondering if there is a relation between the number of students attending class at Holmes each day, and the amount of chocolate bars sold. That is, do you sell more chocolate bars when there are a lot of Holmes students around, and less when Holmes is quiet? If there is a relationship, you might want to keep less chocolate bars in stock when Holmes is closed over the upcoming holiday. With the help of the campus manager, you have compiled the following list covering 7 weeks:
Weekly attendance Number of chocolate bars sold
472 6 916
413 5 884
503 7 223
612 8 158
399 6 014
538 7 209
455 6 214
Tasks:
x 
y 
x^2 
xy 
472 
6916.00 
222784 
3264352 
413 
5884.00 
170569 
2430092 
503 
7223.00 
253009 
3633169 
612 
8158.00 
374544 
4992696 
399 
6014.00 
159201 
2399586 
538 
7209.00 
289444 
3878442 
455 
6214.00 
207025 
2827370 
=3392 
=47618 
=1676576 
=23425707 
Weekly attendance affects number of chocolate bar sold. Weekly attendance is the independent variable while number of chocolate bar sold is the dependent variable. From the above calculations we observe that the regression model is;
The coefficient of the weekly attendance is 10.6772; this means that a unit increase in the weekly attendance would result to an increase in the number of Holmes sold by 10.6772. If the number of weekly attendance increases by 10 then number of Holmes sold would increase by 106.772. It also means that a unit decrease in the weekly attendance would result to a decrease in the number of Holmes sold by 10.6772. If the number of weekly attendance decreases by 10 then number of Holmes sold would also decrease by 106.772.
SUMMARY OUTPUT 













Regression Statistics 






Multiple R 
0.967993 





R Square 
0.93701 





Adjusted R Square 
0.924412 





Standard Error 
224.5952 





Observations 
7 












ANOVA 







df 
SS 
MS 
F 
Significance F 

Regression 
1 
3751817 
3751817 
74.37736 
0.000346 

Residual 
5 
252215 
50442.99 



Total 
6 
4004032 












Coefficients 
Standard Error 
t Stat 
Pvalue 
Lower 95% 
Upper 95% 
Intercept 
1628.689 
605.9 
2.688049 
0.0434 
71.1734 
3186.205 
x 
10.67723 
1.238051 
8.624231 
0.000346 
7.494724 
13.85974 
Thus the coefficient of determination r^{2} is 0.937; this means that 93.7% of the variation in the dependent variable (number of Holmes sold) is explained by the number of weekly attendances.
Question 4 of
HINT: We cover this in Lecture 4 (Probability)
You are the manager of the Holmes Hounds Big Bash League cricket team. Some of your players are recruited inhouse (that is, from the Holmes students) and some are bribed to come over from other teams. You have 2 coaches. One believes in scientific training in computerised gyms, and the other in “grassroots” training such as practising at the local park with the neighbourhood kids or swimming and surfing at Main Beach for 2 hours in the mornings for fitness. The table below was compiled:

Scientific training 
Grassroots training 
Recruited from Holmes students 
35

92 
External recruitment 
54

12 
Tasks (show all your workings):
If A and B are independent events, the probability of this event happening can be calculated as shown below:
If the two events are independent then we would expect;
Hence from the above, we conclude that training is not independent from recruitment
Question 5 of 8
HINT: We cover this in Lecture 5 (Bayes’ Rule)
A company is considering launching one of 3 new products: product X, Product Y or Product Z, for its existing market. Prior market research suggest that this market is made up of 4 consumer segments: segment A, representing 55% of consumers, is primarily interested in the functionality of products; segment B, representing 30% of consumers, is extremely price sensitive; and segment C representing 10% of consumers is primarily interested in the appearance and style of products. The final 5% of the customers (segment D) are fashion conscious and only buy products endorsed by celebrities.
To be more certain about which product to launch and how it will be received by each segment, market research is conducted. It reveals the following new information.
Tasks (show your workings):
Question 6 of 8
HINT: We cover this in Lecture
You manage a luxury department store in a busy shopping centre. You have extremely high foot traffic (people coming through your doors), but you are worried about the low rate of conversion into sales. That is, most people only seem to look, and few actually buy anything
You determine that only 1 in 10 customers make a purchase. (Hint: The probability that the customer will buy is 1/10.
Tasks (show your workings):
On average you have 4 people entering your store every minute during the quiet 1011am slot. You need at least 6 staff members to help that many customers but usually have 7 staff on roster during that time slot. The 7^{th} staff member rang to let you know he will be 2 minutes late. What is the probability 9 people will enter the store in the next 2 minutes? (Hint 1: It is a Poisson distribution. Hint 2: What is the average number of customers entering every 2 minutes? Remember to show all your workings.)
Question 7 of 8
HINT: We cover this in Lecture 7
You are an investment manager for a hedge fund. There are currently a lot of rumours going around about the “hot” property market on the Gold Coast, and some of your investors want you to set up a fund specialising in Surfers Paradise apartments.
You do some research and discover that the average Surfers Paradise apartment currently sells for $1.1 million. But there are huge price differences between newer apartments and the older ones left over from the 1980’s boom. This means prices can vary a lot from apartment to apartment. Based on sales over the last 12 months, you calculate the standard deviation to be $385 000
There is an apartment up for auction this Saturday, and you decide to attend the auction
Tasks (show your workings):
Question 8 of 8
HINT: We cover this in Lecture 8
You are an investment manager for a hedge fund. There are currently a lot of rumours going around about the “hot” property market on the Gold Coast, and some of your investors want you to set up a fund specialising in Surfers Paradise apartments.
Last Saturday you attended an auction to get “a feel” for the local real estate market. You decide it might be worth further investigating. You ask one of your interns to take a quick sample of 50 properties that have been sold during the last few months. Your previous research indicated an average price of $1.1 million but the average price of your assistant’s sample was only $950 000.
However, the standard deviation for her research was the same as yours at $385 000.
Tasks (show your workings):
Yes you can still use normal distribution since the sample size used is relatively large and using the Central limit Theorem the samples will be considered to be approximately normally distributed hence zdistribution can be used to test.
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