Exam 4: Numerical Descriptive Techniques

Weights of Police Officers The following data represent the weights in pounds of a sample of 25 police officers: 164,148,137, 157,173,156,177,172,169,165,145,168,163,162,174,152,156,168,154,151,174,146,134, 140,and 171. -{Weights of Police Officers Narrative} Determine the location and value of the upper quartile of the weights.

(Essay)

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Question 161

The ____________________ uses both the mean and the standard deviation to interpret standard deviation for bell shaped histograms.

(Short Answer)

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Question 162

The is the square root of the .

(Short Answer)

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Question 163

The coefficient of correlation and the least squares line both describe the relationship between two interval variables.

(True/False)

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Question 164

There are three measures of central location; the mean,the ,and the .

(Short Answer)

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Question 165

Ages of Retirees A sociologist recently conducted a survey of retirees over 65 years of age whose net worth is too high to qualify for Medicaid and who have no private health insurance.The ages of 20 uninsured retirees were as follows: 65,66,67,68,69,70,71,73,74,75,78,79,80,81,86,87,91,92,94,and 97. -{Ages of Retirees Narrative} Identify the interquartile range of the ages of the uninsured retirees.What does this value tell you about the data?

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Question 166

Which of the following statements is true for the following observations: 9,8,7,9,6,11,and 13?

(Multiple Choice)

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Question 167

Weights of Police Officers The following data represent the weights in pounds of a sample of 25 police officers: 164,148,137, 157,173,156,177,172,169,165,145,168,163,162,174,152,156,168,154,151,174,146,134, 140,and 171. -{Weights of Police Officers Narrative} Determine the location and value of the lower quartile of the weights.

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Question 168

Percentiles can be converted into quintiles and deciles,where quintiles divide the data into fifths,and deciles divide the data into tenths.

(True/False)

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Question 169

What statistics and graphs can you use to answer the following question: Is the distribution symmetric? If not,is it skewed? If symmetric,is it bell shaped?

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Question 170

A sample of 12 construction workers has a mean age of 25 years.Suppose that the sample is enlarged to 14 construction workers,by including two additional workers having common age of 25 each. Find the mean of the sample of 14 workers.

(Essay)

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Question 171

If the standard deviation of x is 18,the covariance of x and y is 120,the coefficient r = 0.90,then the standard deviation of y is 54.87.

(True/False)

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Question 172

If the coefficient of correlation r = ±1,then the best-fit linear equation will actually include all of the observations.

(True/False)

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Question 173

The denominator in the calculation of the sample covariance,cov (x,y),is:

(Multiple Choice)

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Question 174

If a data set contains an even number of observations,the median is found by taking the ____________________ of these two numbers.

(Short Answer)

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Question 175

In a negatively skewed distribution,which of the following is the correct statement?

(Multiple Choice)

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Question 176

In a positively skewed distribution,which of the following is the correct statement?

(Multiple Choice)

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Question 177

If the coefficient of correlation r = 0,then there can be no linear relationship between the dependent variable y and the independent variable x.

(True/False)

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Question 178

Box plots and medians work well to describe data,while histograms and means work well to describe data.

(Short Answer)

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Question 179

Yearly Donations The following data represent the yearly donations (in thousands of dollars)of a sample of 13 benefactors: 26.5,23.5,29.7,24.8,21.1,24.3,20.4,22.7,27.2,23.7,24.1,24.8,and 28.2. -{Yearly Donations Narrative} Compute the lower quartile for the donations.

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Question 180

Showing 161 - 180 of 275

The ____________________ uses both the mean and the standard deviation to interpret standard deviation for bell shaped histograms.

The is the square root of the .

The coefficient of correlation and the least squares line both describe the relationship between two interval variables.

There are three measures of central location; the mean,the ,and the .

Which of the following statements is true for the following observations: 9,8,7,9,6,11,and 13?

Percentiles can be converted into quintiles and deciles,where quintiles divide the data into fifths,and deciles divide the data into tenths.

What statistics and graphs can you use to answer the following question: Is the distribution symmetric? If not,is it skewed? If symmetric,is it bell shaped?

A sample of 12 construction workers has a mean age of 25 years.Suppose that the sample is enlarged to 14 construction workers,by including two additional workers having common age of 25 each. Find the mean of the sample of 14 workers.

If the standard deviation of x is 18,the covariance of x and y is 120,the coefficient r = 0.90,then the standard deviation of y is 54.87.

If the coefficient of correlation r = ±1,then the best-fit linear equation will actually include all of the observations.

The denominator in the calculation of the sample covariance,cov (x,y),is:

If a data set contains an even number of observations,the median is found by taking the ____________________ of these two numbers.

In a negatively skewed distribution,which of the following is the correct statement?

In a positively skewed distribution,which of the following is the correct statement?

If the coefficient of correlation r = 0,then there can be no linear relationship between the dependent variable y and the independent variable x.

Box plots and medians work well to describe data,while histograms and means work well to describe data.

Yearly Donations The following data represent the yearly donations (in thousands of dollars)of a sample of 13 benefactors: 26.5,23.5,29.7,24.8,21.1,24.3,20.4,22.7,27.2,23.7,24.1,24.8,and 28.2. -{Yearly Donations Narrative} Compute the lower quartile for the donations.

What Is Statistics

Graphical Descriptive Techniques 1

Graphical Descriptive Techniques 2

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Model Building

Nonparametric Statistics

Time-Series Analytics and Forecasting

Statistical Process Control

Decision Analysis

Conclusion

Filters

Exam 4: Numerical Descriptive Techniques

The ____________________ uses both the mean and the standard deviation to interpret standard deviation for bell shaped histograms.

The ____________________ is the square root of the ____________________.

The coefficient of correlation and the least squares line both describe the relationship between two interval variables.

There are three measures of central location; the mean,the ____________________,and the ____________________.

Which of the following statements is true for the following observations: 9,8,7,9,6,11,and 13?

Percentiles can be converted into quintiles and deciles,where quintiles divide the data into fifths,and deciles divide the data into tenths.

What statistics and graphs can you use to answer the following question: Is the distribution symmetric? If not,is it skewed? If symmetric,is it bell shaped?

A sample of 12 construction workers has a mean age of 25 years.Suppose that the sample is enlarged to 14 construction workers,by including two additional workers having common age of 25 each. Find the mean of the sample of 14 workers.

If the standard deviation of x is 18,the covariance of x and y is 120,the coefficient r = 0.90,then the standard deviation of y is 54.87.

If the coefficient of correlation r = ±1,then the best-fit linear equation will actually include all of the observations.

The denominator in the calculation of the sample covariance,cov (x,y),is:

If a data set contains an even number of observations,the median is found by taking the ____________________ of these two numbers.

In a negatively skewed distribution,which of the following is the correct statement?

In a positively skewed distribution,which of the following is the correct statement?

If the coefficient of correlation r = 0,then there can be no linear relationship between the dependent variable y and the independent variable x.

Box plots and medians work well to describe ____________________ data,while histograms and means work well to describe ____________________ data.

Yearly Donations ​ The following data represent the yearly donations (in thousands of dollars)of a sample of 13 benefactors: 26.5,23.5,29.7,24.8,21.1,24.3,20.4,22.7,27.2,23.7,24.1,24.8,and 28.2. ​ ​ -{Yearly Donations Narrative} Compute the lower quartile for the donations.

What Is Statistics

Graphical Descriptive Techniques 1

Graphical Descriptive Techniques 2

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Model Building

Nonparametric Statistics

Time-Series Analytics and Forecasting

Statistical Process Control

Decision Analysis

Conclusion

Filters

The is the square root of the .

There are three measures of central location; the mean,the ,and the .

Box plots and medians work well to describe data,while histograms and means work well to describe data.

Yearly Donations The following data represent the yearly donations (in thousands of dollars)of a sample of 13 benefactors: 26.5,23.5,29.7,24.8,21.1,24.3,20.4,22.7,27.2,23.7,24.1,24.8,and 28.2. -{Yearly Donations Narrative} Compute the lower quartile for the donations.