Question

The health of college students is monitored by periodically weighing them in. A sample of 32 students has a mean weight of 145.9 lb. Assuming that the population standard deviation is known to be 81.2 lb., use a 0.10 significance level to test the claim that the population mean of all such students weights is different than 150 lb. WHAT ARE THE STEPS ON STATCRUNCH?

Answer 1

First we need to decide which test to use.

Since we have population standard deviation is given hence we need to use z-test.

Go to with summary like this:

Stat -->Z Stats --> One sample --> With summary

Enter data like this:

Then click on Compute:

Now, see the p-value and compare it to given level of significance.

If p-value is greater than level of significance then we fail to reject null hypothesis.

Here p-value = 0.7752 > 0.1, so we fail to reject null hypothesis.

So, we don't have sufficient evidence to support the claim that all population mean of all such students weights is different than 150 lb.

I hope this will help. Thank you.