Posted by Henry on Wednesday, April 4, 2012 at 4:45pm.
The manager at the YMCA believes members are staying longer at the Y due to what they feel was a very successful marketing plan. Studies show the previous mean time per visit was 36 minutes, with a standard deviation = 11 minutes. A simple random sample of n = 200 visits is selected, and the current sample mean = 36.8 minutes. Test the manager's claim at a =0.05 using the pvalue.

Statistics  MathGuru, Wednesday, April 4, 2012 at 8:14pm
Try a onesample ztest.
Hypotheses:
Ho: µ = 36 >null hypothesis
Ha: µ > 36 >alternate hypothesis
z = (sample mean  population mean)/(standard deviation divided by the square root of the sample size)
With your data:
z = (36.8  36)/(11/√200) = ?
Finish the calculation.
The pvalue is the actual level of the test statistic. Find it using a ztable. Compare to 0.05 to determine whether or not to reject the null. If the null is rejected, you can conclude a difference.
I hope this will help get you started.
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