Posted by **Rebecca** on Tuesday, October 30, 2007 at 4:04pm.

The mean television viewing time for Americans is 15 hours per week. Suppose a sample of 60 Americans is taken to further investigate viewing habits. Assume the population standard deviation for weekly viewing ime is o = 4 hours.

A What is the probability the sample mean will be within 1 hour of the population mean?

B. What is the probability the sample mean will be within 45 minutes of the population mean?

- Statistics -
**PsyDAG**, Wednesday, October 31, 2007 at 1:57pm
You need to convert the hours to a Z score and then look up the probabilities in the back of your statistics textbook in an appendix labeled something like "areas under the normal distribution."

Z = (X - ƒÊ)/SD, where X = raw score, ƒÊ = mean and SD = standard deviation.

A involves X of 14 to 16, while B involves X of 14.25 to 15.75, converting minutes to portions of an hour.

You should be able to solve it with this information. I hope it helps. Thanks for asking.

- Statistics -
**Anonymous**, Wednesday, March 26, 2014 at 9:15pm
kjjn

- Statistics -
**Anonymous**, Thursday, May 21, 2015 at 4:26pm
0.38680

- Statistics -
**Anonymous**, Wednesday, October 7, 2015 at 10:50am
NO IDEA PLZ HELP ME

## Answer this Question

## Related Questions

- urgent help statistic - A random sample of 20 people who resided within the u.s ...
- statistics - A survey is being planned to determine the mean amount of time ...
- Statistics - A survey is being planned to determine the mean amount of time ...
- statistics - A survey is being planned to determine the mean amount of time ...
- English - * What do you think of your TV viewing habits? What is the part of ...
- statistics - The mean length of a work week for the population of workers was ...
- statistics - A health psychologist, who is interested in childhood obesity, ...
- Statistics - A study was conducted in order to estimate u, the mean number of ...
- Statistics - 1) A sample of 49 observations is taken from a normal population. ...
- statistics - The Office of Student Services at a large western state university ...

More Related Questions