1) Download the Nutrition study data and read it into R-Studio.

1) Download the Nutrition study data and read it into R-Studio. We will work with the entire data set for this assignment. Use the IFELSE( ) function to create 2 new categorical variables. The variables are:

 

Alcohol_Use: 1 (yes) if Alcohol > 0

 

0 (no) if Alcohol=0

 

Age_retired: 1 if Age >= 65

 

0 if Age < 65

 

If you have trouble using the IFELSE( ) function in R, you could create these new categorical variables in EXCEL, and then just read them into R with the dataset. It works either way.

 

Report the counts for each value of these 2 new categorical variables.

 

2) For this problem, we are going to see of smoking (SMOKE) is related to body mass (QUETELET). Here, Quetelet is the continuous dependent response variable (Y) and Smoke (X) is the categorical explanatory variable. Please complete the following:

 

a) Obtain descriptive statistics on Y for each group. In a table report each group’s sample size, mean, standard deviation, and variance.

 

b) Clearly state the null and alternative hypotheses in words and symbols.

 

c) Use R to obtain the test statistic and p-value for the classic pooled variance two sample T-test. Report the test statistic and p-value, and then state the decision to be made.

 

d) Report the formula for the test statistic in part c) and verify the computer’s computations using the descriptive statistics from part a).

 

e) Calculate and report confidence intervals for both groups. Discuss the interpretation of the result based on confidence intervals. Is it consistent with the hypothesis test result? If they are different, which should you believe?

 

3) Moving into a more data analytic framework, then next question would be are there any 2 group categorical variables that exhibit differences relative to the Quetelet variable? Reframing this as more of a direction for an assignment – Using the variable Quetelet as the dependent response variable (Y), conduct hypothesis tests and obtain confidence intervals (for each group) to determine if there are group mean differences relative to the categorical variables:

 

Gender (male vs female)

Age_retired

Alcohol_use

You will need to clearly set up the null and alternative hypotheses, conduct the test with appropriate statistics, and interpret the individual group confidence intervals. Please use tables to summarize your findings. What decisions do you make from these results? How would you summarize the “story” that emerges from these analyses on the Body Mass Quetelet variable?

 

4) Using the CHOLESTEROL variable as the dependent response variable (Y), conduct hypothesis tests and obtain confidence intervals (for each group) to determine if there are group mean differences relative to:

 

Gender (male vs female)

Smoke

Age_retired

Alcohol_use

You will need to clearly set up the null and alternative hypotheses, conduct the test with appropriate statistics, and interpret the individual group confidence intervals. How would you summarize the “story” that emerges from these analyses on the CHOLESTEROL variable?

 

5) Typically, in an open ended data analytic project, the analyst would look to see whether any of the potential response variables are related to the explanatory categorical variables of interest. To limit the amount of analytical work, for the FAT, FIBER, ALCOHOL variables, use a 95% confidence interval approach to compare groups, on average, for

 

Gender (male vs female)

Smoke

Age_retired

Alcohol_use

Do NOT conduct or report on formal Hypothesis tests! How would you summarize the “story” that emerges from these analyses?

 

6) Given what you’ve found so far comparing groups, what is surprising to you? What turned up that you did not expect, if anything? What is it that would explain these results? What do you think should be the next steps to any analysis on this Nutrition data?

 

Your write-up should address each task

1) Download the Nutrition study data and read it into R-Studio.

We offer the best custom writing paper services. We have answered this question before and we can also do it for you.

GET STARTED TODAY AND GET A 20% DISCOUNT coupon code DISC20

We offer the bestcustom writing paper services. We have done this question before, we can also do it for you.

Why Choose Us

  • 100% non-plagiarized Papers
  • 24/7 /365 Service Available
  • Affordable Prices
  • Any Paper, Urgency, and Subject
  • Will complete your papers in 6 hours
  • On-time Delivery
  • Money-back and Privacy guarantees
  • Unlimited Amendments upon request
  • Satisfaction guarantee

How it Works

  • Click on the “Place Order” tab at the top menu or “Order Now” icon at the bottom and a new page will appear with an order form to be filled.
  • Fill in your paper’s requirements in the "PAPER DETAILS" section.
  • Fill in your paper’s academic level, deadline, and the required number of pages from the drop-down menus.
  • Click “CREATE ACCOUNT & SIGN IN” to enter your registration details and get an account with us for record-keeping and then, click on “PROCEED TO CHECKOUT” at the bottom of the page.
  • From there, the payment sections will show, follow the guided payment process and your order will be available for our writing team to work on it.