# Question 12 6 6 points the director of admissions at

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Question 12 6 / 6 points The director of admissions at the University of Maryland, University College is concerned about the high cost of textbooks for the students each semester. A sample of 25 students enrolled in the university indicates that x(bar) = \$315.40 and s = \$43.20. Using a significance level of .1, what are the boundaries of the confidence interval? Question options: 302.438 - 326.184 300.618 - 330.182 297.485 - 327.820 282.871 - 338.475 Use =CONFIDENCE.T(0.1,43.2,25), then add and subtract the result from the sample mean to find the lower and upper limits of the interval Hide Feedback
Question 13 6 / 6 points The director of admissions at the University of Maryland, University College is concerned about the high cost of
textbooks for the students each semester. A sample of 25 students enrolled in the university indicates that x(bar) = \$315.40 and s = \$43.20. A mean that is not in a confidence interval is rejected by the confidence interval, and we say the evidence against the mean is significant. At the 0.10 level of significance, is there evidence against mean \$300?
The director of admissions at the University of Maryland, University College is concerned about the high cost of textbooks for the students each semester. A sample of 25 students enrolled in the university indicates that x(bar) = \$315.40 and s = \$75. (Note the sample standard deviation is different from the first part). A mean that is in a confidence interval is not rejected by the confidence interval, and we say the evidence against the mean is not significant. At the 0.05 level of significance, is there evidence against mean \$300?
No, because 300 is in the confidence interval Yes, because 300 is in the confidence interval Hide Feedback