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September 30, 2014

September 30, 2014

Posted by **Shyra** on Thursday, December 2, 2010 at 12:59pm.

Is the following soluntion correct?

[(1.96*3)/0.25]^2 = 553.1 => 554

- Statistics -
**matt**, Thursday, April 14, 2011 at 7:43pmYES!

- Statistics -
**Visha**, Monday, October 29, 2012 at 2:25pmA survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 14 hours, with a standard deviation of 2.5 hours. It is desired to estimate the mean viewing time within one-quarter hour. The 95 percent level of confidence is to be used.

How many executives should be surveyed?

- Data Analysis -
**Jeannine**, Thursday, May 16, 2013 at 2:44amPopulation mean = 14

Population standard deviation = 2.5

Margin error = 1/4 = 0.25

level of confidence = 0.95

z = 1.96

n =[(1.96*3)/0.25]^2

=553.19

=554

- Statistics -
**Shawn**, Wednesday, June 26, 2013 at 10:05pmStatistical Techniques in Business and Economics 15 edition three years after this post STILL has all the answers wrong for this section.

19. Correct answer is 97

21 correct answer is 196

23 correct answer is 554

25. E=.04,Z=1.96,p=.6, find N.

N=576.24=577(round up)

- Statistics -
**Ryan**, Sunday, June 30, 2013 at 4:47pmBecause Shawn, you guys are doing the problems wrong

- Statistics -
**rizwan**, Monday, November 25, 2013 at 1:27am(1.96*2.5)/0.25)^2=384.16

that's right or wrong??

i'm not understand why the population standard deviation round up to 3??

anyone help? this for question post by shyra..

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