Assignment Task:
Questions
In this assignment, you will be analyzing the data collected in the class survey. A copy of this survey is found on the last page of this assignment.
Questions
1.
Using appropriate methods, individually examine the following variables: lang, eyewear, sex, age, employ, breath and sitting to determine if there are any missing or outlier values. If necessary, delete any values as appropriate. For each variable, comment very briefly on what analysis you used, report what you found, any data edits you performed (if any) and why. (Preferably present it as a table; for example, you could use the template below); otherwise it must be a maximum of one sentence per variable).
2.Calculate a statistical anxiety score (SAS) for each participant using the formula
3. Long sitting times every day are associated with poorer health outcomes. Group the variable sitting into three categories as follows: Low risk (less than 4 hours sitting); medium risk (at least 4 hours sitting, but less than 8 hours); high risk (at least 8 hours sitting). Produce a frequency table that includes the number and percentage of participants in each category.
4. Produce the appropriate plot that shows a breakdown of eyewear (eyewear) used by participants.
5. Produce a histogram of age (age). Write one to three sentences that describe the distribution and provide appropriate summary statistics.
6. Create a two-way table with lang as the rows and employ as the columns. Within each employment category, include the percentage of participants that do and do not speak a language other than English at home. Summarise the table in 1 to 2 sentences.
7. Perform a hypothesis test that investigates whether Introductory Biostatistics students have a mean breath holding time (breath) of 36 seconds. To this end, carry out the following steps:
• State the null hypothesis for this hypothesis test
• Carry out a one-sample t-test
• Calculate a 95% confidence interval for the mean breath holding time (Note: this is not the same as the confidence interval for the mean difference)
• Write a conclusion (2 – 4 sentences long) that summarises the important results
Survey question Variable name
1. What degree program are you enrolled in? degree
2. Do you speak a language other than English at home (yes/no) lang
3. What corrective vision eyewear do you use (glasses, contacts, both, monocle, none)? eyewear
4. What is your Sex (Male, Female, Intersex) sex
5. What is your age in years? age
6. Approximately how much money in dollars did you spend in the previous week on groceries? groc
7. How long (in seconds) can you hold your breath? breath
8. What is your employment status (Full-time, Part-time, Not employed) employ
9. When did you last visit a general practitioner? (Less than 7 days ago, Greater than 7 days, but less than 1 month ago, Greater than 1 month, but less than 6 months ago, Greater than 6 months ago, but less than 1 year ago, Greater than 1 year ago, but less than 2 years ago, Greater than 2 years ago, Never)
doctor
10. About how many hours (to the nearest 0.25 hours (15 minutes)) did you spend sitting down yesterday? sitting
11. On a scale from 0 (not at all anxious) to 10 (extremely anxious), how anxious are you about learning biostatistics? anxi1
12. On a scale from 0 (not at all anxious) to 10 (extremely anxious), how anxious are you about using mathematical equations? anxi2
13. On a scale from 0 (not at all confident) to 10 (extremely confident), how confident are you to learn new computer software?
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