Question 1
Attest for paired data assumes that:
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the sample variances are equal.
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the sample means are different.
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the populations are approximately normally distributed.
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None of the above.
Question 2
College admissions administrators at a university are reevaluating their entrance requirements. They believe that the mean GPA for graduating high school seniors has increased dramatically over the last decade. They randomly sample 85 records of graduating seniors from 10 years ago (sample 1) and find an average GPA of 2.68. An independent random sample of 80 current graduating seniors yields an average GPA of 2.94. If the population variance of high school GPAs is 0.2601, does it appear that there was an increase in mean GPA over the last decade? Select the correctp-value and decision below. Useα= 0.01. Also, stateH0.
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p-value = 0.0005; fail to rejectH0; The null hypothesis is that GPA remained the same.
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p-value = 0.0010; fail to rejectH0; The null hypothesis is that GPA remained the same.
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p-value = 0.0005; rejectH0; The null hypothesis is that GPA remained the same.
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p-value = 0.0010; rejectH0; The null hypothesis is that GPA changed over time.
Laboratory, Institute of Biochemistry, University of Cologne.
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