Exam 7: Sampling and Sampling Distributions

The diameter of small Nerf balls manufactured at a factory in China is expected to be approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08 inches.Suppose a random sample of 20 balls is selected.Calculate the standard deviation of the sampling distribution of the sample mean.

(Multiple Choice)

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Question 101

In order to select a stratified random sample,we divide the population into overlapping groups of similar elements.

(True/False)

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Question 102

A random sample of size 1,000 is taken from a population where p = .20.What is ?

(Multiple Choice)

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Question 103

The mean of the sampling distribution of the sample proportion is equal to _____ when the sample size is sufficiently large.

(Multiple Choice)

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Question 104

In the upcoming election for governor,the most recent poll,based on 900 respondents,predicts that the incumbent will be reelected with 55 percent of the votes.From the 900 respondents,how many indicated that they would not vote for the current governor or indicated that they were undecided?

(Multiple Choice)

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Question 105

When we perform ______________,an element of a population always has a chance of being chosen at each point of selection.

(Multiple Choice)

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Question 106

A random sample of size 1,000 is taken from a population where p = .20.What is

(Multiple Choice)

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Question 107

In random sampling without replacement,each element in the sample will be different.

(True/False)

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Question 108

The sample standard deviation s is an unbiased estimator of the population standard deviation σ.

(True/False)

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Question 109

The reason sample variance has a divisor of n - 1 rather than n is that it makes the variance an unbiased estimate of the population variance.

(True/False)

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Question 110

There is no easy way to calculate an unbiased point estimate of σ.

(True/False)

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Question 111

If p = .9 and n = 40,then we can conclude that the sampling distribution of is approximately a normal distribution.

(True/False)

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Question 112

If a population is known to be normally distributed,then it follows that the sample standard deviation must equal σ.

(True/False)

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Question 113

Suppose that 60 percent of the voters in a particular region support a candidate.Find the probability that a sample of 1,000 voters would yield a sample proportion in favor of the candidate within 2 percentage points.

(Multiple Choice)

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Question 114

The standard deviation of the sampling distribution of the sample mean is σ.

(True/False)

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Question 115

The spread of the sampling distribution of is ____________ the spread of the corresponding population distribution sampling distribution.

(Multiple Choice)

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Question 116

If the sample size n is infinitely large,then s² is an unbiased estimator of σ².

(True/False)

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Question 117

The number of defectives in 10 different samples of 100 observations each is the following: 1,2,1,0,2,3,1,4,2,1.What is the estimate of the population proportion of defectives?

(Multiple Choice)

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Question 118

A manufacturing company measures the weight of boxes before shipping them to the customers.If the box weights have a population mean and standard deviation of 90 lbs.and 24 lbs. ,respectively,then based on a sample size of 36 boxes,what is the probability that the average weight of the boxes will be less than 84 lbs.?

(Multiple Choice)

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Question 119

The diameter of small Nerf balls manufactured at a factory in China is expected to be approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08 inches.Suppose a random sample of 20 balls is selected.What percentage of sample means will be less than 5.14 inches?

(Multiple Choice)

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Question 120

Showing 101 - 120 of 131

In order to select a stratified random sample,we divide the population into overlapping groups of similar elements.

A random sample of size 1,000 is taken from a population where p = .20.What is ?

The mean of the sampling distribution of the sample proportion is equal to _____ when the sample size is sufficiently large.

In the upcoming election for governor,the most recent poll,based on 900 respondents,predicts that the incumbent will be reelected with 55 percent of the votes.From the 900 respondents,how many indicated that they would not vote for the current governor or indicated that they were undecided?

When we perform ______________,an element of a population always has a chance of being chosen at each point of selection.

A random sample of size 1,000 is taken from a population where p = .20.What is

In random sampling without replacement,each element in the sample will be different.

The sample standard deviation s is an unbiased estimator of the population standard deviation σ.

The reason sample variance has a divisor of n - 1 rather than n is that it makes the variance an unbiased estimate of the population variance.

There is no easy way to calculate an unbiased point estimate of σ.

If p = .9 and n = 40,then we can conclude that the sampling distribution of is approximately a normal distribution.

If a population is known to be normally distributed,then it follows that the sample standard deviation must equal σ.

Suppose that 60 percent of the voters in a particular region support a candidate.Find the probability that a sample of 1,000 voters would yield a sample proportion in favor of the candidate within 2 percentage points.

The standard deviation of the sampling distribution of the sample mean is σ.

The spread of the sampling distribution of is ____________ the spread of the corresponding population distribution sampling distribution.

If the sample size n is infinitely large,then s² is an unbiased estimator of σ².

The number of defectives in 10 different samples of 100 observations each is the following: 1,2,1,0,2,3,1,4,2,1.What is the estimate of the population proportion of defectives?

The diameter of small Nerf balls manufactured at a factory in China is expected to be approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08 inches.Suppose a random sample of 20 balls is selected.What percentage of sample means will be less than 5.14 inches?

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Descriptive Statistics: Numerical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Confidence Intervals

Hypothesis Testing

Statistical Inferences Based on Two Samples

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression and Model Building

Process Improvement Using Control Charts

Filters

Exam 7: Sampling and Sampling Distributions

In order to select a stratified random sample,we divide the population into overlapping groups of similar elements.

A random sample of size 1,000 is taken from a population where p = .20.What is ?

The mean of the sampling distribution of the sample proportion is equal to _____ when the sample size is sufficiently large.

In the upcoming election for governor,the most recent poll,based on 900 respondents,predicts that the incumbent will be reelected with 55 percent of the votes.From the 900 respondents,how many indicated that they would not vote for the current governor or indicated that they were undecided?

When we perform ______________,an element of a population always has a chance of being chosen at each point of selection.

A random sample of size 1,000 is taken from a population where p = .20.What is

In random sampling without replacement,each element in the sample will be different.

The sample standard deviation s is an unbiased estimator of the population standard deviation σ.

The reason sample variance has a divisor of n - 1 rather than n is that it makes the variance an unbiased estimate of the population variance.

There is no easy way to calculate an unbiased point estimate of σ.

If p = .9 and n = 40,then we can conclude that the sampling distribution of is approximately a normal distribution.

If a population is known to be normally distributed,then it follows that the sample standard deviation must equal σ.

Suppose that 60 percent of the voters in a particular region support a candidate.Find the probability that a sample of 1,000 voters would yield a sample proportion in favor of the candidate within 2 percentage points.

The standard deviation of the sampling distribution of the sample mean is σ.

The spread of the sampling distribution of is ____________ the spread of the corresponding population distribution sampling distribution.

If the sample size n is infinitely large,then s2 is an unbiased estimator of σ2.

The number of defectives in 10 different samples of 100 observations each is the following: 1,2,1,0,2,3,1,4,2,1.What is the estimate of the population proportion of defectives?

The diameter of small Nerf balls manufactured at a factory in China is expected to be approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08 inches.Suppose a random sample of 20 balls is selected.What percentage of sample means will be less than 5.14 inches?

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Descriptive Statistics: Numerical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Confidence Intervals

Hypothesis Testing

Statistical Inferences Based on Two Samples

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression and Model Building

Process Improvement Using Control Charts

Filters

If the sample size n is infinitely large,then s² is an unbiased estimator of σ².