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Using and Interpreting Concepts

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Using and Interpreting Concepts
Testing Claims Using P-values,
(a) write the claim mathematically and identify Ho and Ha.
(b) find the standardized test statistic and its corresponding area.
(c) find the value.
(d) decide whether to reject or fail to reject the null hypothesis.
(e) interpret the decision in the context of the original claim.
35. Tea Drinkers A tea drinker's society estimates that the mean consumption
of tea by a person in the United States is more than 7 gallons per year. In a
sample of 100 people, you find that the mean consumption of tea is 7.8
gallons per year with a standard deviation of 2.67 gallons.At a=0.07, can
you support the society's claim? (Adapted from U.S. Department of Agriculture)

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The solution examines using and interpreting concepts.

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Using and Interpreting Concepts
Testing Claims Using P-values,
(a) write the claim mathematically and identify Ho and Ha.
(b) find the standardized test statistic and its corresponding area.
(c) find the value.
(d) decide whether to reject or fail to reject the null hypothesis.
(e) interpret the decision in the context of the original claim.
35. Tea ...

Solution provided by:
Changping Wang, MA
Education
  • BSc , Wuhan Univ. China
  • MA, Shandong Univ.
Recent Feedback
  • "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
  • "excellent work"
  • "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
  • "Thank you"
  • "Thank you very much for your valuable time and assistance!"
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