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Exam 8: Confidence Interval Estimation

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Question 101

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Instruction 8-5 The actual voltages of power packs labelled as 12 volts are as follows: 11.77, 11.90, 11.64, 11.84, 12.13, 11.99, and 11.77. -Referring to Instruction 8-5,it is possible that the 99% confidence interval calculated from the data will not contain the mean voltage for the sample.

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Question 102

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The confidence interval estimate of the population proportion is constructed around the sample proportion.

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Question 103

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A university dean is interested in determining the proportion of students who receive some sort of financial aid.Rather than examine the records of all students,the dean randomly selects 200 students and finds that 118 of them are receiving financial aid.The 95% confidence interval for π is 0.59 ± 0.07.Interpret this interval.

A race car driver tested his car for time from 0 to 100 km/h,and in 20 tests obtained an average of 4.85 seconds with a standard deviation of 1.47 seconds.A 95% confidence interval for the 0 to 100 time is 4.52 seconds to 5.18 seconds.

Instruction 8-10 The actual voltages of power packs labelled as 12 volts are as follows: 11.77, 11.90, 11.64, 11.84, 12.13, 11.99, and 11.77. -Referring to Instruction 8-10,a 99% confidence interval for the mean voltage of the power packs is from ____________ to _____.

Instruction 8-16 The Registrar of a university would like to estimate the proportion of the student population who owns a personal computer. In a sample of 500 students, 417 own a personal computer. -Referring to Instruction 8-16,a 95% confidence interval for the proportion of student population who own a personal computer is narrower than a 99% confidence interval.