Any state Auto Insurance Company took a random sample of 390 insurance claims paid out during a 1-year

period. The average claim paid was $1505. Assume σ = $258.

Find a 0.90 confidence interval for the mean claim payment. (Round your answers to two decimal places.) lower limit     $ upper limit     $

Find a 0.99 confidence interval for the mean claim payment. (Round your answers to two decimal places.) lower limit     $ upper limit     $

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9-

Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a “need for closure scale” to a group of students enrolled in an introductory psychology course. The “need for closure scale” has scores ranging from 101 to 201. For the 72 students in the highest quartile of the distribution, the mean score was x = 175.30. Assume a population standard deviation of σ = 7.65. These students were all classified as high on their need for closure. Assume that the 72 students represent a random sample of all students who are classified as high on their need for closure.

Find a 95% confidence interval for the population mean score μ on the “need for closure scale” for all students with a high need for closure. (Round your answers to two decimal places.)

lower limit:    

upper limit:

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11-

A research group conducted an extensive survey of 3024 wage and salaried workers on issues ranging from relationships with their bosses to household chores. The data were gathered through hour-long telephone interviews with a nationally representative sample. In response to the question, “What does success mean to you?” 1573 responded, “Personal satisfaction from doing a good job.”

Let p be the population proportion of all wage and salaried workers who would respond the same way to the stated question. Find a 90% confidence interval for p. (Round your answers to three decimal places.)

lower limit :   

upper limit :   

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