Information regarding the price of a roll of camera film 35 mm, 24 exposure) for a sample of 12 cities worldwide is shown below. Determine a 95% confidence interval for the population mean. Price of Film Information \(\begin{array}{ll} \text { Mean } & 5.3667 \\ \text { Standard Error } & 0.7409 \\ \text { Median } & 4.8700 \\ \text { Standard Deviation } & 2.5666 \\ \text { Sample Variance } & 6.5873 \\ \text { Kurtosis } & 4.0201\\ \text { Skewness } & 1.8041 \\ \text { Range } & 9.4100 \\ \text { Minimum } & 2.7300 \\ \text { Maximum } & 12.1400 \\ \text { Sum } & 64.4000 \\ \text { Count } & 12 .0000 \end{array}\)

The answer of Information regarding the price of a roll...

Exam 8: Interval Estimation

Whenever the population standard deviation is unknown and the population has a normal or near-normal distribution, which distribution is used in developing an interval estimation?

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Question 21

If we change a 95% confidence interval estimate to a 99% confidence interval estimate, we can expect

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Question 22

A random sample of 53 observations was taken. The average in the sample was 90 with a variance of 400. a. Construct a 98% confidence interval for μ. b. Construct a 99% confidence interval for μ. c. Discuss why the 98% and 99% confidence intervals are different. d. What would you expect to happen to the confidence interval in Part a if the sample size was increased? Be sure to explain your answer.

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Question 23

When constructing a confidence interval for the population mean and the standard deviation of the sample is used, the degrees of freedom for the t distribution equals

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Question 24

It is known that the variance of a population equals 1296. A random sample of 144 observations is going to be taken from the population. a. With a 0.95 probability, what statement can be made about the size of the margin of error? b. With a 0.95 probability, how large of a sample would have to be taken to provide a margin of error of 6 or less?

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Question 25

Information regarding the price of a roll of camera film 35 mm, 24 exposure) for a sample of 12 cities worldwide is shown below. Determine a 95% confidence interval for the population mean. Price of Film Information Mean 5.3667 Standard Error 0.7409 Median 4.8700 Standard Deviation 2.5666 Sample Variance 6.5873 Kurtosis 4.0201 Skewness 1.8041 Range 9.4100 Minimum 2.7300 Maximum 12.1400 Sum 64.4000 Count 12.0000

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Question 26

In determining the sample size necessary to estimate a population proportion, which of the following information is not needed?

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Question 27

In order to estimate the average time spent on the computer terminals per student, data were collected for a sample of 49 business students over a one week period. Assume the population standard deviation is 1.4 hours. The standard error of the mean is

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Question 28

The sample size needed to provide a margin of error of 2 or less with a .95 probability when the population standard deviation equals 11 is

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Question 29

A random sample of 81 children with working mothers showed that they were absent from school an average of 6 days per term with a standard deviation of 1.8 days. Provide a 95% confidence interval for the average number of days absent per term for all the children.

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Question 30

You are given the following information obtained from a random sample of 5 observations taken from a large population. 32 34 32 30 32 Construct a 95% confidence interval for the mean of the population, assuming the population has a normal distribution.

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Question 31

In interval estimation, the t distribution is applicable only when

(Multiple Choice)

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Question 32

The value added and subtracted from a point estimate in order to develop an interval estimate of the population parameter is known as the

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Question 33

The Highway Safety Department wants to study the driving habits of individuals. A sample of 81 cars traveling on the highway revealed an average speed of 67 miles per hour with a standard deviation of 9 miles per hour. a. Compute the standard error of the mean. b. Determine a 99% confidence interval estimate for the speed of all cars.

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Question 34

A sample of 20 items from a population with an unknown σ is selected in order to develop an interval estimate of μ. Which of the following is not necessary?

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Question 35

From a population with a variance of 900, a sample of 225 items is selected. At 95% confidence, the margin of error is

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Question 36

An interval estimate is a range of values used to estimate

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Question 37

An Excel printout of the descriptive measures of daily checking account balances in dollars) of customers of First Daisy Bank is shown below. Develop a 95% confidence interval estimate for the mean of the population of the checking balances. Account Balance Information Mean 4828.29 Median 5115.25 Mode 4976.50 Standard Deviation 1143.57 Sample Variance 1307763.49 Kuitosis 8.63 Skewness -3.06 Range 4968.50 Minimum 600.00 Maximum 5568.50 Sum 173818.50 Count 36.00

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Question 38

A sample of 200 elements from a population with a known standard deviation is selected. For an interval estimation of μ, the proper distribution to use is the

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Question 39

Which of the following best describes the form of the sampling distribution of the sample proportion?

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Question 40

Showing 21 - 40 of 128

Whenever the population standard deviation is unknown and the population has a normal or near-normal distribution, which distribution is used in developing an interval estimation?

If we change a 95% confidence interval estimate to a 99% confidence interval estimate, we can expect

When constructing a confidence interval for the population mean and the standard deviation of the sample is used, the degrees of freedom for the t distribution equals

In determining the sample size necessary to estimate a population proportion, which of the following information is not needed?

In order to estimate the average time spent on the computer terminals per student, data were collected for a sample of 49 business students over a one week period. Assume the population standard deviation is 1.4 hours. The standard error of the mean is

The sample size needed to provide a margin of error of 2 or less with a .95 probability when the population standard deviation equals 11 is

A random sample of 81 children with working mothers showed that they were absent from school an average of 6 days per term with a standard deviation of 1.8 days. Provide a 95% confidence interval for the average number of days absent per term for all the children.

You are given the following information obtained from a random sample of 5 observations taken from a large population. 32 34 32 30 32 Construct a 95% confidence interval for the mean of the population, assuming the population has a normal distribution.

In interval estimation, the t distribution is applicable only when

The value added and subtracted from a point estimate in order to develop an interval estimate of the population parameter is known as the

A sample of 20 items from a population with an unknown σ is selected in order to develop an interval estimate of μ. Which of the following is not necessary?

From a population with a variance of 900, a sample of 225 items is selected. At 95% confidence, the margin of error is

An interval estimate is a range of values used to estimate

A sample of 200 elements from a population with a known standard deviation is selected. For an interval estimation of μ, the proper distribution to use is the

Which of the following best describes the form of the sampling distribution of the sample proportion?

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