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The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

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Your Turn

1. Formulate a hypothesis statement for the following claim: “The average adult drinks 1.7 cups of coffee per day.” A sample of 35 adults drank an average of 1.95 cups per day. Assume the population standard deviation is 0.5 cups. Using α = 0.10, test your hypothesis. What is your conclusion?
2. Formulate a hypothesis statement for the following claim: “The average age of our customers is less than 40 years old.” A sample of 50 customers had an average age of 38.7 years. Assume the population standard deviation is 12.5 years. Using α = 0.05, test your hypothesis. What is your conclusion?
3. Formulate a hypothesis statement for the following claim: “The average life of our light bulbs is more than 1,000 hours.” A sample of 32 light ...

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