Exam 7: Sampling and Sampling Distributions

A random sample of ten examination papers in a course that was given on a pass or fail basis showed the following scores. a.What is the point estimate for the mean of the population? b.What is the point estimate for the standard deviation of the population? c.What is the point estimate for the proportion of all students who passed the course?

(Short Answer)

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Question 101

Random samples of size 17 are taken from a population that has 200 elements, a mean of 36, and a standard deviation of 8. Which of the following best describes the form of the sampling distribution of the sample mean for this situation?

(Multiple Choice)

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Question 102

A simple random sample of 64 observations was taken from a large population. The sample mean and the standard deviation were determined to be 320 and 120 respectively. The standard error of the mean is

(Multiple Choice)

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Question 103

A population has a mean of 84 and a standard deviation of 12. A sample of 36 observations will be taken. The probability that the sample mean will be between 80.54 and 88.9 is

(Multiple Choice)

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Question 104

The life expectancy in the United States is 75 with a standard deviation of 7 years. A random sample of 49 individuals is selected. a.What is the probability that the sample mean will be larger than 77 years? b.What is the probability that the sample mean will be less than 72.7 years? c.What is the probability that the sample mean will be between 73.5 and 76 years? d.What is the probability that the sample mean will be between 72 and 74 years? e. What is the probability that the sample mean will be larger than 73.46 years?

(Short Answer)

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Question 105

A simple random sample of 28 observations was taken from a large population. The sample mean equaled 50. Fifty is a

(Multiple Choice)

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Question 106

The number of random samples (without replacement) of size 3 that can be drawn from a population of size 5 is

(Multiple Choice)

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Question 107

Exhibit 7-2 A random sample of 10 examination papers in a course, which was given on a pass or fail basis, showed the following scores. -Refer to Exhibit 7-2. The point estimate for the mean of the population is

(Multiple Choice)

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Question 108

A sample of 92 observations is taken from an infinite population. The sampling distribution of is approximately

(Multiple Choice)

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Question 109

Convenience sampling is an example of

(Multiple Choice)

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Question 110

Students of a large university spend an average of $5 a day on lunch. The standard deviation of the expenditure is $3. A simple random sample of 36 students is taken. a.What are the expected value, standard deviation, and shape of the sampling distribution of the sample mean? b.What is the probability that the sample mean will be at least $4? c.What is the probability that the sample mean will be at least $5.90?

(Short Answer)

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Question 111

From a population of 500 elements, a sample of 225 elements is selected. It is known that the variance of the population is 900. The standard error of the mean is approximately

(Multiple Choice)

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Question 112

Which of the following sampling methods does not lead to probability samples?

(Multiple Choice)

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Question 113

The following information gives the number of days absent from work for a population of 5 workers at a small factory. a.Find the mean and the standard deviation for the population. b.Samples of size 2 will be drawn from the population. Use the answers in part a to calculate the expected value and the standard deviation of the sampling distribution of the sample mean. c.Find all the samples of 2 workers that can be extracted from this population. Choose the samples without replacement. d.Compute the sample mean for each of the samples in Part c.

(Essay)

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Question 114

Stratified random sampling is a method of selecting a sample in which

(Multiple Choice)

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Question 115

Exhibit 7-2 A random sample of 10 examination papers in a course, which was given on a pass or fail basis, showed the following scores. -Refer to Exhibit 7-2. The point estimate for the variance of the population is

(Multiple Choice)

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Question 116

A population characteristic, such as a population mean, is called

(Multiple Choice)

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Question 117

A single numerical value used as an estimate of a population parameter is known as

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Question 118

Exhibit 7-1 A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i.e., of the population) is 0.22 ounces. -Refer to Exhibit 7-1. The standard error of the mean equals

(Multiple Choice)

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Question 119

Exhibit 7-2 A random sample of 10 examination papers in a course, which was given on a pass or fail basis, showed the following scores. -Refer to Exhibit 7-2. The point estimate for the standard deviation of the population is

(Multiple Choice)

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Question 120

Showing 101 - 120 of 131

Random samples of size 17 are taken from a population that has 200 elements, a mean of 36, and a standard deviation of 8. Which of the following best describes the form of the sampling distribution of the sample mean for this situation?

A simple random sample of 64 observations was taken from a large population. The sample mean and the standard deviation were determined to be 320 and 120 respectively. The standard error of the mean is

A population has a mean of 84 and a standard deviation of 12. A sample of 36 observations will be taken. The probability that the sample mean will be between 80.54 and 88.9 is

A simple random sample of 28 observations was taken from a large population. The sample mean equaled 50. Fifty is a

The number of random samples (without replacement) of size 3 that can be drawn from a population of size 5 is

Exhibit 7-2 A random sample of 10 examination papers in a course, which was given on a pass or fail basis, showed the following scores. -Refer to Exhibit 7-2. The point estimate for the mean of the population is

A sample of 92 observations is taken from an infinite population. The sampling distribution of is approximately

Convenience sampling is an example of

From a population of 500 elements, a sample of 225 elements is selected. It is known that the variance of the population is 900. The standard error of the mean is approximately

Which of the following sampling methods does not lead to probability samples?

Stratified random sampling is a method of selecting a sample in which

Exhibit 7-2 A random sample of 10 examination papers in a course, which was given on a pass or fail basis, showed the following scores. -Refer to Exhibit 7-2. The point estimate for the variance of the population is

A population characteristic, such as a population mean, is called

A single numerical value used as an estimate of a population parameter is known as

Exhibit 7-1 A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i.e., of the population) is 0.22 ounces. -Refer to Exhibit 7-1. The standard error of the mean equals

Exhibit 7-2 A random sample of 10 examination papers in a course, which was given on a pass or fail basis, showed the following scores. -Refer to Exhibit 7-2. The point estimate for the standard deviation of the population is

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Interval Estimation

Hypothesis Tests

Comparisons Involving Means, Experimental Design and Analysis of Variance

Comparisons Involving Proportions and a Test of Independence

Simple Linear Regression

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