A simple random sample generated 12 male and 18 female adults identified by their primary care physicians as being over-weight. These adults were fed a special high protein diet for a month and had a sample mean weight loss of 10 pounds with a sample standard deviation of 3.2 pounds.We would like to conduct a test to determine whether the average weight loss for all adults is less than 11 pounds at a 1% level of significance.

What would be the appropriate test statistic?

Select one:

a.one-sample z-test

b.one-sample t-test

c.confidence interval using z

d.matched paired test

e.confidence interval using t

I would like to know how can you solve it.