Sleep Time A person read that the average number of hours an adult sleeps on Friday night to Saturday morning was 6.8 hours. The researcher feels that college students do not sleep 6.8 hours on average. The researcher randomly selected 12 students and found that on average they slept 7.3 hours. The standard deviation of the sample is 1.3 hours. At a=0.10, is there enough evidence to say that college students do not sleep 6.8 hours on average? Assume that the population is approximately normally distributed. Use the P-value method and tables. Part 1 of 5 (a) State the hypotheses and identify the claim. H.: u = 6.8 not claim 7 H: # 6.8 claim This hypothesis test is a two-tailed test. Part: 1/5 Part 2 of 5 (b) Compute the test value. Always round t score values to three decimal places. t =
Internet visits A U.S. Web Usage Snapshot indicated a monthly average of 36 Internet visits of a particular website per user from home. A random sample of 24 Internet users yielded a sample mean of 37.3 visits with a standard deviation of 5.3. At the 0.01 level of significance, can it be concluded that this differs from the national average? Assume the population is normally distributed. Part 1 of 5 (a) State the hypotheses and identify the claim. H.: u = 36 not claim H: u # 36 claim This hypothesis test is a two-tailed test. Part: 1/5 Part 2 of 5 (b) Find the critical value(s). Round the answer to three decimal places, if necessary. If there is more than one critical value, separate them with commas. Critical value(s):
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