Posted by **Kate** on Tuesday, March 9, 2010 at 9:19pm.

A student group claims that first-year students at a university must study 2.5 hours (150 minutes) per night during the school week. A skeptic suspects that they study less than that on the average. A class survey finds that the average study time claimed by 269 students is = 144 minutes, with a sample standard deviation of 70.

A) Regard these students as a random sample of all first-year students and suppose we know that the study times follow a Normal distribution. What is the standard error of the sample mean?

B) Consider the hypotheses H0: μ = 150 against Ha: μ < 150. What is the value of the test statistic? Give your answer to two decimal places.

## Answer this Question

## Related Questions

- statistics - The Office of Student Services at a large western state university ...
- Statistics - A class survey in a large class for first-year college students ...
- Statistics - 28. A group of statistics students decided to conduct a survey at ...
- statistics - A sample of the number of study per week of college students is ...
- math - A class survey in a large class for first-year college students asked, “...
- Statistics - A group of statistics students decided to conduct a survey at their...
- statistic - 1. Compute descriptive statistics for liberal art colleges and ...
- Statistics - A group of statistics students decided to conduct a survey at their...
- statistics - A group of statistics students decided to conduct a survey at their...
- Hypothesis Statistics - At one school, the average amount of time that tenth-...