A Washington Post poll shows that concerns about housing payments have spiked despite some improvements in the overall economy. In all, 53 percent of the 900 American adults surveyed said they are very concerned or somewhat concerned about having the money to make their monthly payment. Let p represent the population proportion of all American adults who are very concerned or somewhat concerned about having the money to make their monthly payment. Which are the appropriate hypotheses to assess if a majority of American adults are worried about making their mortgage or rent payments?
a. H0: p = 0.50 versus Ha: p > 0.50
b. H0: p 0.50 versus Ha: p < 0.50
c. H0: p = 0.53 versus Ha: p > 0.53
d. H0: p = 0.50 versus Ha: p = 0.53
Question 2
Scores on an English spelling test are determined for a sample of 16 5th graders both before and after they learn some new vocabulary tricks of the trade. In the population of difference scores it is know that students improve with an average of 3 points, with a standard deviation of 4 points, and that the distribution of the differences is approximately normal. What is the expected value of the sample mean difference in spelling scores?
a. 16
b. 5
c. 3
d. 4
Post-transcription Modification
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