# STATS Experiment Assignment 2016

April 14, 2018

In this activity you will
investigate the differences between two major brands of soda pop. (Example
Pepsi Vs. Coke, Orange Crush Vs. Kroger Orange, A&W Vs. Kroger Root Beer,
etc …)
1. What populations are you studying?
2. To compare, decide if you want to use independent (10.1, 10.2) or
matched sampling (10.3). Which would be better and why? (Note: this is
important! Hopefully you chose “matched”)
3. You will need several taste testers and a way to keep everything
as unbiased as possible. Consider carefully what things would need to be
considered to do this. Example: Would the pop brand they tasted first have any
bearing on the outcome?
4. Explain carefully how you set up the test and what you did to
avoid any kind of potential bias.
Data

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To test and see what
Americans think about the future, go to.pollingreport.com/life.htm”>Polling Report. Under NBC
News/Wall Street Journal Poll conducted by Hart Research Associates,
consider the results to the question: “Do you feel confident or
not confident that life for our children’s generation will be better than it
has been for us?”

Are Americans more pessimistic about the future than they were ten years ago?
1. Run a hypothesis test to see if the percentage of people in 2014
that responded “not confident” has increased significantly since
1993. Note that it states on the website that the samples are of size 500. Use
alpha = .05 Run the test using the Test Statistic / Critical Value approach.
Set up the null and alternative hypotheses andShow
all your work. Make sure to explain what the test results
tell you in the context of the problem.
2. Why or why not are you surprised by these results?
3. What is the p-value? Run the test using the p-value / level of
significance approach.
4. What is the population being studied in this test?
5. What are the population parameters that are being measured?
6. What cautions may there in using survey (polling data) such as
this?

NBC News/Wall Street
Journal Poll conducted
by Hart Research Associates (D) and Public Opinion Strategies (R). July
30-Aug. 3, 2014. N=approx. 500 adults nationwide.

“Do you feel
confident or not confident that life for our children’s generation will be
better than it has been for us?”

Confident

Not
confident

Unsure

%

%

%

7/30 – 8/3/14

21

76

3

5/16-20/12

30

63

7

8/26-/30/10

27

66

7

12/11-14/09

27

66

7

6/12-15/09

31

57

12

9/19-22/08 RV

35

56

10

12/14-17/07

30

64

6

1/07

33

60

7

7/06

27

65

8

12/01

49

42

9

9/93

25

68

7

12/92

41

52

7

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