Posted by **jamie brice** on Sunday, November 13, 2011 at 10:21pm.

based on a random sample of 640 college students, the mean amount of sleep college students. construct a 95% confidence interval for the mean amount of sleep per night for college studenrs.

- statistics -
**MathGuru**, Monday, November 14, 2011 at 5:42pm
Formula:

CI95 = mean + or - 1.96(sd/√n)

...where + or - 1.96 represents the 95% interval using a z-table, sd = standard deviation, and n = sample size.

Fill in the data and calculate the interval.

- statistics -
**Anonymous**, Wednesday, November 16, 2011 at 9:02pm
1) A sample of 49 observations is taken from a normal population. The sample mean is 55 and the sample standard deviation is 10. Determine the 99% confidence interval for the population mean.

2) The Fox TV network is considering replacing one of its primetime crime investigation shows with a new family-oriented comedy show. Before a final decision is made, network executives commission a sample of 400 viewers. After viewing the comedy, 250 indicated they would watch the new show and suggested it replace the crime investigation show.

A) Estimate the value of the population proportion.

B) Compute the standard error of the proportion.

C) Develop a 99% CI for the population proportion.

D) Interpret your findings

## Answer this Question

## Related Questions

- statistics - The typical amount of sleep per night for undergraduate college ...
- statistics - College students average 7.8 hours of sleep per night with a ...
- AP Statistics - A school psychologist reports that the mean number of hours the ...
- Statistics - I am not sure how to even get started on this question could ...
- statistics - The number of hours that college students sleep on a week night is...
- Math - According to a student project for statistics 250, the amount of money ...
- Math please help! - According to a student project for statistics 250, the ...
- statistics - A random sample of 36 statistics students were asked to add a ...
- Math-Statistics - A marketing research company needs to estimate which of two ...
- Statistics - You want to know if there's a difference between the proportions ...