Sixteen randomly chosen people suffering from excess weight are placed on a year

Question

Sixteen randomly chosen people suffering from excess weight are placed on a year-long exercise regimen and their weights before and after are compared. The claim is that this exercise regimen will allow participants to lose an average of at least 20 lbs in a year. After one year, the weight losses for each participant were measured. The sample data were plotted and found to follow an approximately Normal distribution with no outliers. The average weight loss in this group was 24.7 lbs. with a sample standard deviation of 12.4 lbs. Is it one-sided or two-sided?

Explanation / Answer

this is one sided test as we are checking if weight has been reduced from before mean weight.

As we are checking for the left tail test that is if value has decreased.

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