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
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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
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