Weight loss: In a study to determine whether counseling could help people lose weight, a sample of people experienced agroup-basedbehavioralintervention,which involved weekly meetings with a trained interventionist for a period of sixmonths.The following data are the numbers of pounds lost for

14

people.Assume the population is approximatelynormal.Perform a hypothesis test to determine whether the mean weight loss is greater than

18

pounds.Use the =0.01

level of significance and the

P-value method with theTI-84Pluscalculator.

21.9	27.9	7.1	23.4	20.7	12.4	16.7
20.5	37.0	33.1	11.6	35.6	23.2	18.7

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Part 1 of 4

(a) State the appropriate null and alternate hypotheses. Use symbols necessary for answer.

H0 : H1 : This hypothesis test is a (Choose one) test. is it left, right or two tailed test?

What is the P- value?

Do we reject or fail to reject the hypotheses?

Do we have enough evidence?