Posted by nono on Tuesday, November 20, 2012 at 1:37pm.
recent suggestion is 60 min of exercise per day. A sample of 50 adults in a study of risk factor report exercising a mean of 38 min per day with a standerd deviation of 19 min .based on sampal data, is physical activity significantly less than recommended? Run the appropriate test at a 5% level of significance.

biostatistic  MathGuru, Tuesday, November 20, 2012 at 7:19pm
Use a onesample ztest.
z = (sample mean  population mean)/(standard deviation divided by the square root of the sample size)
With your data:
z = (38  60)/(19/√50) = ?
Finish the calculation.
Check a ztable at .05 level of significance for a onetailed test.
If the ztest statistic exceeds the critical value from the ztable, reject the null and conclude ยต < 60 (which is the alternative hypothesis). If the ztest statistic does not exceed the critical value from the ztable, do not reject the null.
I hope this will help get you started.
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