23. An auto manufacturer claims that its cars go from 0 to 60 in 5.9 seconds or less. A sample of 15 cars shows that the average time to go from 0 to 60 is 6.8 seconds, with a sample standard deviation of 2.2 seconds. Is the company wrong in its claim?

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23. An auto manufacturer claims that its cars go from 0 to 60 in 5.9 seconds or less. A
sample of 15 cars shows that the average time to go from 0 to 60 is 6.8 seconds, with a
sample standard deviation of 2.2 seconds. Is the company wrong in its claim?
24. At a local pool, a new swimming instructor (Teacher 1) is being evaluated by how many of
his students pass a standard swimming test. Of his 30 students, 17 passed the test.
However, the more experienced instructor (Teacher 2), who taught 85 students, had 62
pass the test.
Is this enough evidence to show that the pass rate for Teacher 1's students is lower than
that of Teacher 2's students? (Use a = .10)
Transcribed Image Text:23. An auto manufacturer claims that its cars go from 0 to 60 in 5.9 seconds or less. A sample of 15 cars shows that the average time to go from 0 to 60 is 6.8 seconds, with a sample standard deviation of 2.2 seconds. Is the company wrong in its claim? 24. At a local pool, a new swimming instructor (Teacher 1) is being evaluated by how many of his students pass a standard swimming test. Of his 30 students, 17 passed the test. However, the more experienced instructor (Teacher 2), who taught 85 students, had 62 pass the test. Is this enough evidence to show that the pass rate for Teacher 1's students is lower than that of Teacher 2's students? (Use a = .10)
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