An investigator is interested in knowing whether college students get 6.75 hours

Question

An investigator is interested in knowing whether college students get 6.75 hours/night of sleep on the weekend. He/she obtains the Getting to Know You Survey dataset and analyzes the variable zzz. weekend, which is the average number of hours of sleep per night that a student receives during the weekend. He/she generated the following R output: One Sample t-test data zzz. week t = 3.856, df = 447, p-value = 0.0001322 alternative hypothesis true mean is not equal to 6.75 95 percent confidence interval: sample estimates: mean of x 6.961161 What may be the 95% confidence interval (denoted by XXXXXXXXX and XXXXXXXXX)? No calculation is necessary (A) (6.25, 6.50) (B) (6.45, 6.70) (C) (6.65, 6.90) (D) (6.85, 7.10) What may be the approximate value of the test statistic if the investigator is interested in testing whether students sleep more than 6.75 hrs? (A) -1.93 (B) 1.93 (C) 3.86 (D) 7.72

Explanation / Answer

here what ever test one tail or two tail test you do test statistic does remain same for both the test.

Only p value for two tailed test is twice that of one tailed test

hence as test stat for two tailed is 3.86 so does that for one tailed test

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