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July 25, 2014

July 25, 2014

Posted by **badar** on Monday, December 26, 2011 at 10:25am.

a. Construct a 99% confidence interval for the difference between the mean times spent watching television by all high school students and all college students.

b. Test at the 2.5% significance level if the mean time spent watching television per day by high school students is higher than the mean time spent watching television by college students.

- statistics -
**PsyDAG**, Monday, December 26, 2011 at 2:06pmZ = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√n

If only one SD is provided, you can use just that to determine SEdiff.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.

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