Statistics Problems - 10

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7. Award: 0.20 points    

A new weight-watching company, Weight Reducers International, advertises that those who join will lose an average of 10 pounds after the first two weeks. The standard deviation is 2.8 pounds. A random sample of 50 people who joined the weight reduction program revealed a mean loss of 9 pounds. At the 0.05 level of significance, can we conclude that those joining Weight Reducers will lose less than 10 pounds? What is the conclusion regarding the null hypothesis?

H0. The mean weight loss is 10 pounds.

References

Worksheet Difficulty: 2 Intermediate

Learning Objective: 10-06 Use a t statistic to test a hypothesis.