Project 2
Part 1- Observational Study (Utilizing Chapter 7)
For this first project you will be collecting an article that contains research in the form of an observational study.
(2 points) Valid source article.
(3 points) State how you know the study is observational.
(5 points) List the intended population and the sample used for the study.
(5 point) Describe the type of observational study you have and what question they are trying to answer. Is this study a sample survey, is it a case-control study, is it a cohort study, etc.? Explain the reasoning for your answer.
(10 points) If the sampling design is given, describe the sampling design using the appropriate vocabulary from the book. Is this sampling design a good one (relatively) or poor? Explain why you chose the design you chose and why you believe it is poor/good. If there is no sampling design given, state what you think it could have possibly been based on the context given. Also be sure to point out any flaw or suspicion you may have if a sampling design is not present.
(5 points) Is there bias in the observational study? Are there variables that could be confounding? Explain your reasoning, be sure to use appropriate vocabulary from the book to do so. Remember there are many ways to be bias, some could include sampling choice, others could include questions asked or wording used in surveying.

PART 2
(20 points) Do creative people make better salespeople? Ten sales staff in a large company were given a creativity test (scores range from 0 to 20, with higher scores indicating greater creativity) and were evaluated regarding sales growth performance (a score of 100 indicates an average performance, and larger scores indicate better performance). The creativity scores and sales growth performance scores are given below:
Creativity Score    Sales Growth
9                         93
7                         89
8                         95
13                      101
10                      102
10                         96
9                         95
18                         111
10                         103
14                         107
a. Which is the explanatory variable in this scenario? Which is the response variable in this scenario? Explain your reasoning.
b. What is the least squares regression line (linear model) for this data? What is the correlation coefficient for this data?
c. Based on the correlation coefficient, do you think this model is a good representation for our data? Explain your reasoning.
d. Write a sentence using numbers and units to explain the meaning of the slope your model in part (b) and this situation.
This question is continue on the next page.
e. Use your model in part (b) to predict Sales Growth when someone’s Creativity Score is 20. Could you necessarily guarantee the Sales Growth? Why or why not? Use appropriate vocabulary to explain your reasoning. (Note: If you were unable to come up with a model, please one up and show that you can still do the mathematics requested in this question.) Write out your calculations for this.
f. Use your model in part (b) to predict the Creativity Score someone would have if their Sales Growth was 89. Write out your calculations for this.
5. List two common ways to display quantitative data.
6. If you are sitting at the mean of your data set, how many standard deviations do you have when at the mean? Explain your reasoning.

Project 2 Part 1- Observational Study (Utilizing Chapter 7) For...