# 401077 Introduction To Biostatistics

## Question:

Research question: Does the average minutes of moderate to vigorous physical activity (MVPA)differ between overweight and non-overweight University students

Use the assignment data set assigned to you: Variables to analyse: ‘MVPA’and ‘overweight’Note: Each student will get different answers as the data sets differ.

1. Draw histograms of MVPA by overweight status.Add reasonable axis labels.
2. Name the statistical test you would you use to address the above research question using the data set provided. Explain why this test is appropriate.
3. Answer the research question by conducting your chosen statistical test on the data set provided. Please use R Commander but format your answer following the 5 step method.

Consider the research question “Is the mean weight of Australian university students heavier at graduation than at enrolment?”Suppose the following data was collected to address this hypothesis.

 student ID weight at enrolment (kgs) weight at graduation (kgs) 1 86 89 2 64 73 3 51 55 4 73 72 5 63 80 6 69 70

Identify the most appropriate statistical test for addressing theresearch question using the given data. Explain why this test is appropriate.(Note: Please do not run any analyses or conduct the statistical test.)

Research question: How different are theaverage GPAsof overweight and non-overweight Australian University students

Use the assignment data set assigned to you: Variables to analyse: ‘GPA’ and ‘overweight’

Note: Each student will get different answers as the data sets differ.

1. Using R Commander, calculate the 95% confidence interval for the difference in mean GPA between the overweight and non-overweight groups.
1. Carefully write in words, what this confidence interval is telling us.
2. From the results in a) can we conclude that there a statistically significant difference in mean GPA between overweight and non-overweight Australian university students Explain why or why not.

Estimate the minimum sample size required to detect a difference of 0.5in mean GPA between the overweight and non-overweight retirees with and power=0.80 . (That is, this difference could be between 4 and 4.5 or between 4.5 and 5.0. You can choose any means as long as they are 0.5 apart.) Assume the population standard deviation is and equal group sizes. Present your answer as a sentence which summarises the required sample size to achieve what power subject to what conditions.

Research question: Does the proportion of overweight students differ by sex in the population of Australian university students

Use the assignment data set assigned to you: Variables to analyse: ‘overweight’ and ‘sex’

Note: Each student will get different answers as the data sets differ.

1. Show the relationship between overweight and sex using a two way contingency table. Include either row or column percentages.Type and label the table yourself:an R Commander screenshot will not be accepted.
1. Looking at the results in part a) only, is there any evidence of association between sex and overweight status in this sampleof Australian university students Explain why or why not.
2. Are the requirements for a Chi-square test met Explain why.

Estimate the minimum sample size required to produce a 95% confidence interval with a margin of error of  for the proportion ofAustralia university students. Assume that 40% of this population will be overweight. Present your answer as a sentence which summarises the required sample size to achieve what confidence level subject to what conditions.

### Cite This Work

"401077 Introduction To Biostatistics." My Assignment Help, 2021, https://myassignmenthelp.com/free-samples/401077-introduction-to-biostatistics/source-dataset.html.

My Assignment Help (2021) 401077 Introduction To Biostatistics [Online]. Available from: https://myassignmenthelp.com/free-samples/401077-introduction-to-biostatistics/source-dataset.html
[Accessed 02 February 2023].

My Assignment Help. '401077 Introduction To Biostatistics' (My Assignment Help, 2021) <https://myassignmenthelp.com/free-samples/401077-introduction-to-biostatistics/source-dataset.html> accessed 02 February 2023.

My Assignment Help. 401077 Introduction To Biostatistics [Internet]. My Assignment Help. 2021 [cited 02 February 2023]. Available from: https://myassignmenthelp.com/free-samples/401077-introduction-to-biostatistics/source-dataset.html.

## Stuck on Any Question

250 words

### We Can Help!

Get top notch assistance from our best tutors !

### Content Removal Request

If you are the original writer of this content and no longer wish to have your work published on Myassignmenthelp.com then please raise the content removal request.

## 5% Cashback

On APP - grab it while it lasts!