Question 1

Which of the following is used as a divisor in the sample variance s2,where n is the sample size?

Accepted Answer

A) n + 1 
B) n 
C) n - 1 
D) n - 2 
A) n + 1 
B) n 
C) n - 1 
D) n - 2

Question 2

A distribution which contains a relatively small proportion of low values is said to be:

Accepted Answer

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

Question 3

Calculate the first,second,and third quartiles of the following sample:

Accepted Answer

Q₁ = value in the 0.25 (n + 1)^th ordered po

Question 4

What is the median of 36,40,37,42,45,41,34,and 39?

Accepted Answer

A) 39 
B) 39.5 
C) 40 
D) 41 
A) 39 
B) 39.5 
C) 40 
D) 41

Question 5

The shift supervisor at a local manufacturing plant collected data on the number of defects coming off an assembly line over the past eight weeks (40 work days).She summarized the data in the following frequency table.
   
What is the weighted average number of errors per night?

Accepted Answer

The answer of The shift supervisor at a local manufacturing...

Question 6

For the following three samples,for which sample is the data most closely grouped about the sample mean? Give a written explanation that supports your conclusion.
Sample 1: 15,16,19,21,28;
Sample 2: 44,49,50,51,57;and
Sample 3: 122.8,123.7,124.6,130.5,135.8.

Accepted Answer

Since the coefficient of variation,CV,me

Question 7

The standard deviation,as a measure of variation (dispersion),can be understood by examining two statements that tell us how the standard deviation relates to the data: the Empirical Rule and Chebyshev's Theorem.

Accepted Answer

A) True 
 B)False

Question 8

A student scores 89,75,94,and 88 on four exams during the semester and 97 on the final exam.If the final is weighted double and the four others weighted equally,the student's final average would be 90.

Accepted Answer

A) True 
 B)False

Question 9

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Consider the following scores on a 20 point aptitude test for two samples of eight students each:
Sample 1: 18,19,17,15,14,20,14,and 16
Sample 2: 14,15,13,11,10,16,10,and 12
-Calculate the mean score in sample 1.

Accepted Answer

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

Question 10

The interquartile range measures the spread of the middle 50% of the data.

Accepted Answer

A) True 
 B)False

Question 11

A variable measured at the interval or ratio level can have more than one arithmetic mean.

Accepted Answer

A) True 
 B)False

Question 12

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
The number of students eating breakfast at the school dining commons was recorded over 110 days last semester.These data are presented below.
  
-Calculate the quantities   
,   
   
,and   
   
.

Accepted Answer

@#IMG-DLM&
@#IMG-DLM&  = 25,70

Question 13

To find percentiles and quantities,data must be first arranged in:

Accepted Answer

A) descending order. 
B) ascending order. 
C) alphabetical order. 
D) scattered order. 
A) descending order. 
B) ascending order. 
C) alphabetical order. 
D) scattered order.

Question 14

Measures of central tendency are usually computed from population data rather than from sample data.

Accepted Answer

A) True 
 B)False

Question 15

The 30th percentile,P30,is a value such that at most 30% of the data are smaller in value than P30 and at most 70% of the data are larger.

Accepted Answer

A) True 
 B)False

Question 16

The covariance of the following sample data of four (X,Y)pairs: (1,5),(2,10),(4,7),and (5,9)equals:

Accepted Answer

A) 1.25 
B) 2.50 
C) 3.75 
D) 3.69 
A) 1.25 
B) 2.50 
C) 3.75 
D) 3.69

Question 17

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A small accounting office is trying to determine its staffing needs for the coming tax season.The manager has collected the following data: 46,27,79,57,99,75,48,89,and 85.These values represent the number of returns the office completed each year over the entire nine years it has been doing tax returns.
-For this data,what is the interquartile for the number of tax returns completed each year?

Accepted Answer

Location of Q₁ = 0.25(n + 1)= 0

Question 18

The numerical measures mean,median,and mode provide information concerning the:

Accepted Answer

A) frequency of a data set. 
B) evaluation of a data set. 
C) location of the center of a data set. 
D) direction of a data set. 
A) frequency of a data set. 
B) evaluation of a data set. 
C) location of the center of a data set. 
D) direction of a data set.

Question 19

The median can be determined for any set of ordinal,interval or ratio-level data.

Accepted Answer

A) True 
 B)False

Question 20

If the mean is greater than the median,then the distribution is skewed to the right.

Accepted Answer

A) True 
 B)False

Which of the following is used as a divisor in the sample variances²,where n is the sample size?

A distribution which contains a relatively small proportion of low values is said to be:

Calculate the first,second,and third quartiles of the following sample:

What is the median of 36,40,37,42,45,41,34,and 39?

The shift supervisor at a local manufacturing plant collected data on the number of defects coming off an assembly line over the past eight weeks (40 work days).She summarized the data in the following frequency table. What is the weighted average number of errors per night?

For the following three samples,for which sample is the data most closely grouped about the sample mean? Give a written explanation that supports your conclusion. Sample 1: 15,16,19,21,28; Sample 2: 44,49,50,51,57;and Sample 3: 122.8,123.7,124.6,130.5,135.8.

The standard deviation,as a measure of variation (dispersion),can be understood by examining two statements that tell us how the standard deviation relates to the data: the Empirical Rule and Chebyshev's Theorem.

A student scores 89,75,94,and 88 on four exams during the semester and 97 on the final exam.If the final is weighted double and the four others weighted equally,the student's final average would be 90.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Consider the following scores on a 20 point aptitude test for two samples of eight students each: Sample 1: 18,19,17,15,14,20,14,and 16 Sample 2: 14,15,13,11,10,16,10,and 12 -Calculate the mean score in sample 1.

The interquartile range measures the spread of the middle 50% of the data.

A variable measured at the interval or ratio level can have more than one arithmetic mean.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: The number of students eating breakfast at the school dining commons was recorded over 110 days last semester.These data are presented below. -Calculate the quantities , ,and .

To find percentiles and quantities,data must be first arranged in:

Measures of central tendency are usually computed from population data rather than from sample data.

The 30^th percentile,P₃₀,is a value such that at most 30% of the data are smaller in value than P₃₀ and at most 70% of the data are larger.

The covariance of the following sample data of four (X,Y)pairs: (1,5),(2,10),(4,7),and (5,9)equals:

The numerical measures mean,median,and mode provide information concerning the:

The median can be determined for any set of ordinal,interval or ratio-level data.

If the mean is greater than the median,then the distribution is skewed to the right.

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

Which of the following is used as a divisor in the sample variance s2,where n is the sample size?

A distribution which contains a relatively small proportion of low values is said to be:

Calculate the first,second,and third quartiles of the following sample:

What is the median of 36,40,37,42,45,41,34,and 39?

The shift supervisor at a local manufacturing plant collected data on the number of defects coming off an assembly line over the past eight weeks (40 work days).She summarized the data in the following frequency table. What is the weighted average number of errors per night?

For the following three samples,for which sample is the data most closely grouped about the sample mean? Give a written explanation that supports your conclusion. Sample 1: 15,16,19,21,28; Sample 2: 44,49,50,51,57;and Sample 3: 122.8,123.7,124.6,130.5,135.8.

The standard deviation,as a measure of variation (dispersion),can be understood by examining two statements that tell us how the standard deviation relates to the data: the Empirical Rule and Chebyshev's Theorem.

A student scores 89,75,94,and 88 on four exams during the semester and 97 on the final exam.If the final is weighted double and the four others weighted equally,the student's final average would be 90.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Consider the following scores on a 20 point aptitude test for two samples of eight students each: Sample 1: 18,19,17,15,14,20,14,and 16 Sample 2: 14,15,13,11,10,16,10,and 12 -Calculate the mean score in sample 1.

The interquartile range measures the spread of the middle 50% of the data.

A variable measured at the interval or ratio level can have more than one arithmetic mean.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: The number of students eating breakfast at the school dining commons was recorded over 110 days last semester.These data are presented below. -Calculate the quantities , ,and .

To find percentiles and quantities,data must be first arranged in:

Measures of central tendency are usually computed from population data rather than from sample data.

The 30th percentile,P30,is a value such that at most 30% of the data are smaller in value than P30 and at most 70% of the data are larger.

The covariance of the following sample data of four (X,Y)pairs: (1,5),(2,10),(4,7),and (5,9)equals:

The numerical measures mean,median,and mode provide information concerning the:

The median can be determined for any set of ordinal,interval or ratio-level data.

If the mean is greater than the median,then the distribution is skewed to the right.

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

Which of the following is used as a divisor in the sample variances²,where n is the sample size?

The 30^th percentile,P₃₀,is a value such that at most 30% of the data are smaller in value than P₃₀ and at most 70% of the data are larger.