Question 1

According to Chebyshev's Theorem,what percent of the observations lie within ±2.25 standard deviations of the mean?

Accepted Answer

A) at least 80.25% 
B) at least 75.25% 
C) at least 55.56% 
D) at least 95.25% 
A) at least 80.25% 
B) at least 75.25% 
C) at least 55.56% 
D) at least 95.25%

Question 2

The sample covariance must take a value between -1 and +1 inclusive.

Accepted Answer

A) True 
 B)False

Question 3

Quartiles are descriptive measures that separate large data sets into:

Accepted Answer

A) squares. 
B) two halves. 
C) three thirds. 
D) four quarters. 
A) squares. 
B) two halves. 
C) three thirds. 
D) four quarters.

Question 4

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Calculate the following sample observations on fracture strength:
128,131,142,168,87,93,105,114,96,and 98.
-Calculate and interpret the value of the sample standard deviation,

Accepted Answer

s = @#IMG-DLM& 
= @#IMG-DLM& 
= 25.75
In general,t

Question 5

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
The following data represent scores on a 15 point aptitude test: 8,10,15,12,14,and 13.
-Subtract 5 from every observation and complete the sample variance for the original data and the new data.

Accepted Answer

@#IMG-DLM& 
= 6.80,a

Question 6

If you are interested in comparing variation in sales for small and large stores selling similar goods,which of the following is the most appropriate measure of dispersion?

Accepted Answer

A) the range 
B) the interquartile range 
C) the standard deviation 
D) the coefficient of variation 
A) the range 
B) the interquartile range 
C) the standard deviation 
D) the coefficient of variation

Question 7

The following values represent the annual snowfall,measured in inches,at a local ski resort over the past 10 years: 123,87,143,133,182,176,96,104,201,and 152.What is the mean snowfall over the past 10 years? What is the standard deviation?

Accepted Answer

Mean = 139

Question 8

The manager of a local RV sales lot has collected data on the number of RVs sold per month for the last five years.That data is summarized below:  
What is the weighted mean number of sales per month?

Accepted Answer

A) 3.31 
B) 3.23 
C) 3.54 
D) 3.62 
A) 3.31 
B) 3.23 
C) 3.54 
D) 3.62

Question 9

Suppose that the average score on an exam is 73 with a standard deviation of 2.According to Chebyshev's theorem,at least 60% of the scores are in the interval between 70 and 76.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following descriptive statistics is least affected by outliers?

Accepted Answer

A) mean 
B) median 
C) range 
D) standard deviation 
A) mean 
B) median 
C) range 
D) standard deviation

Question 11

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A set of data is mounded,with a mean of 500 and a variance of 576.
-Approximately what proportion of the observations is greater than 572?

Accepted Answer

The value 572 is three standard deviatio

Question 12

Which of the following statements is true?

Accepted Answer

A) Measures of variability are numbers that describe the scatter of the data or the extent to which the data values are spread out. 
B) The range is the most useful measure of variability. 
C) The weighted mean is the most useful measure of variability. 
D) All of the above 
A) Measures of variability are numbers that describe the scatter of the data or the extent to which the data values are spread out. 
B) The range is the most useful measure of variability. 
C) The weighted mean is the most useful measure of variability. 
D) All of the above

Question 13

Calculate the correlation coefficient between ice cream sales and temperature.

Accepted Answer

The answer of Calculate the correlation coefficient between ice cream...

Question 14

In describing numerical data,the data is usually best described by the mean because it is not affected by outliers.

Accepted Answer

A) True 
 B)False

Question 15

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
An investment councilor recently reviewed the account activity of a sample of 10 of his clients and calculated the average number of stock trades per month over the past year for each client.He obtained the following data values: 10.2,2.5,11.4,3.2,1.1,3.4,8.4,9.7,11.2,and 2.4
-Calculate the standard deviation.

Accepted Answer

Standard d

Question 16

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
In a recent survey,200 top executives were asked how many hours they spend each year in community service.The data are presented below.
  
-What is the estimated mean amount of time spent by these executives in community service?

Accepted Answer

The answer of THE NEXT QUESTIONS ARE BASED ON THE...

Question 17

For which type of distribution is the mean usually greater than the median when measuring continuous numerical unimodal data?

Accepted Answer

A) skewed-left 
B) skewed-right 
C) symmetrical 
D) flat 
A) skewed-left 
B) skewed-right 
C) symmetrical 
D) flat

Question 18

What conclusions can you draw about the relationship between ice cream sales and daily temperature?

Accepted Answer

There appears to be

Question 19

Which measures of central tendency are not affected by extremely small or extremely large values?

Accepted Answer

A) arithmetic mean and median 
B) arithmetic mean and mode 
C) arithmetic mean and geometric mean 
D) median and mode 
A) arithmetic mean and median 
B) arithmetic mean and mode 
C) arithmetic mean and geometric mean 
D) median and mode

Question 20

In spite of its advantage in discounting extreme observations,the median is used less frequently than the mean.Why?

Accepted Answer

In spite of its advantage in discounting

According to Chebyshev's Theorem,what percent of the observations lie within ±2.25 standard deviations of the mean?

The sample covariance must take a value between -1 and +1 inclusive.

Quartiles are descriptive measures that separate large data sets into:

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Calculate the following sample observations on fracture strength: 128,131,142,168,87,93,105,114,96,and 98. -Calculate and interpret the value of the sample standard deviation,

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: The following data represent scores on a 15 point aptitude test: 8,10,15,12,14,and 13. -Subtract 5 from every observation and complete the sample variance for the original data and the new data.

If you are interested in comparing variation in sales for small and large stores selling similar goods,which of the following is the most appropriate measure of dispersion?

The following values represent the annual snowfall,measured in inches,at a local ski resort over the past 10 years: 123,87,143,133,182,176,96,104,201,and 152.What is the mean snowfall over the past 10 years? What is the standard deviation?

The manager of a local RV sales lot has collected data on the number of RVs sold per month for the last five years.That data is summarized below: What is the weighted mean number of sales per month?

Suppose that the average score on an exam is 73 with a standard deviation of 2.According to Chebyshev's theorem,at least 60% of the scores are in the interval between 70 and 76.

Which of the following descriptive statistics is least affected by outliers?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A set of data is mounded,with a mean of 500 and a variance of 576. -Approximately what proportion of the observations is greater than 572?

Which of the following statements is true?

Calculate the correlation coefficient between ice cream sales and temperature.

In describing numerical data,the data is usually best described by the mean because it is not affected by outliers.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: In a recent survey,200 top executives were asked how many hours they spend each year in community service.The data are presented below. -What is the estimated mean amount of time spent by these executives in community service?

For which type of distribution is the mean usually greater than the median when measuring continuous numerical unimodal data?

What conclusions can you draw about the relationship between ice cream sales and daily temperature?

Which measures of central tendency are not affected by extremely small or extremely large values?

In spite of its advantage in discounting extreme observations,the median is used less frequently than the mean.Why?

Describing Data: Graphical

Probability

Discrete Random Variables and Probability Distributions

Continuous Random Variables and Probability Distributions

Sampling and Sampling Distributions

Estimation: Single Population

Estimation: Additional Topics

Hypothesis Testing: Single Population

Hypothesis Testing: Additional Topics

Simple Regression

Multiple Regression

Additional Topics in Regression Analysis

Analysis of Categorical Data

Analysis of Variance

Time-Series Analysis and Forecasting

Additional Topics in Sampling

Filters

Exam 2: Describing Data: Numerical

According to Chebyshev's Theorem,what percent of the observations lie within ±2.25 standard deviations of the mean?

The sample covariance must take a value between -1 and +1 inclusive.

Quartiles are descriptive measures that separate large data sets into:

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Calculate the following sample observations on fracture strength: 128,131,142,168,87,93,105,114,96,and 98. -Calculate and interpret the value of the sample standard deviation,

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: The following data represent scores on a 15 point aptitude test: 8,10,15,12,14,and 13. -Subtract 5 from every observation and complete the sample variance for the original data and the new data.

If you are interested in comparing variation in sales for small and large stores selling similar goods,which of the following is the most appropriate measure of dispersion?

The following values represent the annual snowfall,measured in inches,at a local ski resort over the past 10 years: 123,87,143,133,182,176,96,104,201,and 152.What is the mean snowfall over the past 10 years? What is the standard deviation?

The manager of a local RV sales lot has collected data on the number of RVs sold per month for the last five years.That data is summarized below: What is the weighted mean number of sales per month?

Suppose that the average score on an exam is 73 with a standard deviation of 2.According to Chebyshev's theorem,at least 60% of the scores are in the interval between 70 and 76.

Which of the following descriptive statistics is least affected by outliers?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A set of data is mounded,with a mean of 500 and a variance of 576. -Approximately what proportion of the observations is greater than 572?

Which of the following statements is true?

Calculate the correlation coefficient between ice cream sales and temperature.

In describing numerical data,the data is usually best described by the mean because it is not affected by outliers.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: In a recent survey,200 top executives were asked how many hours they spend each year in community service.The data are presented below. -What is the estimated mean amount of time spent by these executives in community service?

For which type of distribution is the mean usually greater than the median when measuring continuous numerical unimodal data?

What conclusions can you draw about the relationship between ice cream sales and daily temperature?

Which measures of central tendency are not affected by extremely small or extremely large values?

In spite of its advantage in discounting extreme observations,the median is used less frequently than the mean.Why?

Describing Data: Graphical

Probability

Discrete Random Variables and Probability Distributions

Continuous Random Variables and Probability Distributions

Sampling and Sampling Distributions

Estimation: Single Population

Estimation: Additional Topics

Hypothesis Testing: Single Population

Hypothesis Testing: Additional Topics

Simple Regression

Multiple Regression

Additional Topics in Regression Analysis

Analysis of Categorical Data

Analysis of Variance

Time-Series Analysis and Forecasting

Additional Topics in Sampling

Filters