To better understand the cost of attendance at NCSU, the university asked a rand

Question

To better understand the cost of attendance at NCSU, the university asked a random sample of 80 undergraduate students about the amount they had spent on textbooks (in dollars) during the current term. The 95% confidence interval created from this data was $375 ± $35. This interval indicates:

Select one or more:

That $35 is 95% of the true average for all undergraduate students.

That the average of all undergraduate students at this university must be $375.

That 95% of all undergraduate students at this university spent between $340 and $410 on textbooks this term.

That if we take many samples from this population 95% of them will have a sample mean between $340 aand $410.

The parent population is skewed and thus 5% of the students spent less than $340 or greater than $410 on textbooks.

The standard deviation of the sample is about 5% smaller than the population standard deviation.

We are 95% confident that the average for the 80 students sampled is between $340 and $410.

We believe that the average for all NCSU undergraduate students is between $340 and $410.

Explanation / Answer

Answers for this question are -

That 95% of all undergraduate students at this university spent between $340 and $410 on textbooks this term.

That if we take many samples from this population 95% of them will have a sample mean between $340 aand $410.

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