Statistics Questions and Problems - BUQU 1230

Complete the following questions as specified below.  Assignments that are fully completed as requested will automatically receive full marks.   

1. Recently, a Kwantlen instructor chose three students from a class of 10.  How many different groups of 3 could the instructor have potentially selected?

2. A recent study concluded that 90 percent of Kwantlen students have a cell phone.  If there are 5 Kwantlen students in a study group, what is the chance that three of them don’t have cell phones?

3. Do males or females feel more stressed out at work?  A survey of employed adults revealed the following (see Levine et. al, 2017: pg. 157 for more details)  

a.  What kind of table is this?

b. Construct a joint probability table.

c.  Given that someone feels stressed out at work what’s the chance that they’re male?

d. Given that someone’s male what’s the chance that they’re stressed out?

e. What’s the chance that a randomly selected study respondent is male?

f. Do feeling stressed out at work and gender, appear to be related?

You’re told that among all 18 sections of BUQU 1230 the average score on the first midterm is 66 and the standard deviation is 15.  Answer the following questions:

1.  If you took 400 samples, with 20 BUQU 1230 students in each sample, and found the average of each 20-student sample – what would the standard deviation of this sampling distribution be called?  Calculate the value for the standard deviation of the sampling distribution.

2. Referring to the 400 samples that you’ve taken (with 20 students in each sample), between what two values would you expect to find the middle 50% of the sampled averages?

3. Now let’s say you took 400 samples, with 50 BUQU 1230 students in each sample, and found the average of each 50-student sample – what would the standard deviation of the sampling distribution be?   Between what two values would you expect to find the middle 50% of the sampled averages?

4. Explain the difference between your answers to 2 & 3.