For a “before and after” test, 16 of a sample of 25 people improved their scores on a test after receiving computer-based instruction. For H 0 : p = 0.50; H 1:p is not equal to 0.50; and a significance level of .05:
A sample group was surveyed to determine which of two brands of soap was preferred. H 0 :p = 0.50; H 1: p is not equal to 0.50. Thirty-eight of 60 people indicated a preference. At the .05 level of significance, we can conclude that:
The performance of students on a test resulted in a mean score of 25. A new test is instituted and the instructor believes the mean score is now lower. A random sample of 64 students resulted in 40 scores below 25. At a significance level of α = .05:
A golf club manufacturer claims that the median length of a drive using its driver is 250 yards. A consumer group disputes the claim, indicating that the median will be considerably less. A sample of 500 drives is measured; of these 220 were above 250 yards, and none was exactly 250 yards. The null and alternate hypotheses are:
The data below indicate the rankings of a set of employees according to class theory and on-the-job practice evaluations:
What is the Spearman correlation of coefficient for the data?
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