Question

A political scientist hypothesizes that a political ad will reduce attitudes about a particular issue. The...

A political scientist hypothesizes that a political ad will reduce attitudes about a particular issue. The scientist randomly asks 31 individuals walking by to see the ad and then take a quiz on the issue. The general public that knows little to nothing about the issue, on average, scores 50 on the quiz. The individuals that saw the ad scored an average of 53.59 with a variance of 25.70. What can the political scientist conclude with an α of 0.05?

a) What is the appropriate test statistic?
---Select--- na z-test one-sample t-test independent-samples t-test related-samples t-test

b)
Population:
---Select--- individuals walking by general public the ad the political ad the particular issue
Sample:
---Select--- individuals walking by general public the ad the political ad the particular issue

c) Compute the appropriate test statistic(s) to make a decision about H0.
(Hint: Make sure to write down the null and alternative hypotheses to help solve the problem.)
critical value =  ; test statistic =
Decision:  ---Select--- Reject H0 Fail to reject H0

d) If appropriate, compute the CI. If not appropriate, input "na" for both spaces below.
[  ,  ]

e) Compute the corresponding effect size(s) and indicate magnitude(s).
If not appropriate, input and/or select "na" below.
d =  ;   ---Select--- na trivial effect small effect medium effect large effect
r2 =  ;   ---Select--- na trivial effect small effect medium effect large effect

f) Make an interpretation based on the results.

Individuals that watched the political ad scored significantly higher on the quiz than the general public.

Individuals that watched the political ad scored significantly lower on the quiz than the general public.   

Individuals that watched the political ad did not score significantly different on the quiz than the general public.

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