A political candidate wishes to determine if endorsing increased social spending is likely to affect her standing in the polls. She has access to data on the popularity of several other candidates who have endorsed increased spending. The data was available both before and after the candidates announced their positions on the issue. The data are as follows:
Candidate
Popularity Ratings
Before After
42 43
41 45
50 56
52 54
58 65
32 29
39 46
42 48
48 ':' 47
47 53
Assuming no other factors were influencing the popularity ratings
State the null hypothesis.
Endorsing increased social spending does not affect standing in the polls.
a. State the nondirectional alternative hypothesis.
Endorsing increased social spending does affect standing in the polls.
c. What is the value of t obtained. =
d. What is the value of t critical. =
d. What might the candidate conclude using α = 0.012 tail? =
e. What type error might the candidate have made?
f. calculate cohen's d use SD for popularity before.