Question 1

In a given data set the 25th percentile is _______________ equal the lower hinge.

Accepted Answer

A)  Always
B)  Sometimes
C)  Never B

Question 2

In a hearing test,subjects estimate the loudness (in decibels)of sound,and the results are;68,67,70,71,68,75,68,62,80,73,68 What is the IQR?

Accepted Answer

A)  18
B)  6
C)  5
D)  7.5
E)  15 C

Question 3

Quality control is an important issue at ACME Company which manufactures light bulbs.In order to conduct testing of the life hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted.378,361,350,375,200,391,375,368,321 What are the outer fences?

Accepted Answer

A)  274.0,438.0
B)  212.5,499.5
C)  397.0,438.0
D)  458.5,499.5
E)  61.5,123.0 B

Question 4

Quality control is an important issue at ACME Company which manufactures light bulbs.In order to conduct testing of the life hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted.378,361,350,375,200,391,375,368,321 What is the 65th percentile?

Accepted Answer

A)  335.5
B)  370.5
C)  380.6
D)  296.8
E)  375

Question 5

The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m. ).They selected 13 patrons and had them get in line between 2 and 3 p.m.Each was given a stop watch to record the time they spent in line.The times recorded were as follows (in minutes)(mean = 114.15): 118,124,108,116,99,120,148,118,119,121,45,130,118 What is the variance?

Accepted Answer

A)  103
B)  23.62
C)  557.97
D)  128.8
E)  115

Question 6

In a statistic class,10 scores were randomly selected with the following results were obtained: 74,73,77,77,71,68,65,77,67,66 What is the 65th percentile?

Accepted Answer

A)  65.9
B)  67.3
C)  66.75
D)  73.85
E)  77.0

Question 7

In a statistic class,10 scores were randomly selected with the following results were obtained: 74,73,77,77,71,68,65,77,67,66 What is the third quartile?

Accepted Answer

A)  65.9
B)  67.3
C)  66.75
D)  73.85
E)  77.0

Question 8

In a hearing test,subjects estimate the loudness (in decibels)of sound,and the results are (mean = 70): 68,67,70,71,68,75,68,62,80,73,68 What is the standard deviation?

Accepted Answer

A)  18
B)  4.73
C)  22.40
D)  324
E)  6.76

Question 9

If one intends to compare the relative variation between two samples involving two different quantitative variables with different measurement scales,then the most appropriate way is to compare the two samples:

Accepted Answer

A)  Standard deviations
B)  Variances
C)  Coefficient of variations
D)  Ranges
E)  Interquartile ranges

Question 10

If the mean,median,and mode for a given population all equal 25,then we Know that its distribution is

Accepted Answer

A)  Bimodal
B)  Skewed to the right
C)  Symmetric
D)  Skewed to the left

Question 11

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.A random sample of the price of 10 computers was taken with the following results (mean = $3,213): $3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000 What is the standard deviation?

Accepted Answer

A)  1359
B)  4993
C)  1846575
D)  3587
E)  1976454

Question 12

The average life of Canadian women is 73.75 years and the standard deviation of the women's life expectancy in Canada is 6.5 years. Based on Chebyshev's inequality determine the upper and lower bounds on the average life expectancy of the Canadian women such that at least 90% of all population is included.

Accepted Answer

A)  [12.09 135.41]
B)  [8.75 138.75]
C)  [53.20 94.30]
D)  [66.38 81.13]
E)  [67.25 80.25

Question 13

In a statistic class,10 scores were randomly selected with the following results were obtained: 74,73,77,77,71,68,65,77,67,66 What is the median?

Accepted Answer

A)  71.5
B)  72.0
C)  77.0
D)  71.0
E)  73.0

Question 14

In a study of the factors that affect success in economics,data were collected for 8 business students.Scores on a calculus placement test are given with economics final exam scores.The data are below:  It can be shown that for these data:  = 17.75,  = 70.38,  2 = 237.50,  2 = 545.875,  = 140.75 Calculate the sample covariance.

Accepted Answer

A)  17.59
B)  7.93
C)  2.00
D)  33.93
E)  20.11

Question 15

In a survey of 550 randomly-selected college statistic students were surveyed on their impressions of their course,instructor and textbook.The results are as follows:  Compute a point estimate of the proportion of all college statistic students who think their instructor was "very effective"

Accepted Answer

A)  0.136
B)  0.536
C)  0.182
D)  0.280
E)  0.014

Question 16

As a measure of variation,the sample _________ is easy to understand and compute.It is based on the two extreme values and is therefore a highly unstable measure.

Accepted Answer

A)  Range
B)  Standard deviation
C)  Variance
D)  Interquartile range
E)  Coefficient of variation

Question 17

The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m. ).They selected 13 patrons and had them get in line between 2 and 3 p.m.Each was given a stop watch to record the time they spent in line.The times recorded were as follows (in minutes)118,124,108,116,99,120,148,118,119,121,45,130,118 What is the first quartile?

Accepted Answer

A)  100.8
B)  119.8
C)  128.8
D)  112
E)  122.5

Question 18

The range of the measurement is the largest measurement plus the small measurement.

Accepted Answer

A) True 
 B)False

Question 19

In a study of employee stock ownership plans,data was collected at seven companies on satisfaction with the plan and the amount of organization commitment.  It can be shown that for these data:  ,  ,  
  ,  Calculate the sample covariance.

Accepted Answer

A)  0.3164
B)  0.2711
C)  0.3717
D)  0.3250
E)  0.3810

Question 20

All of the following are measures of central tendency except the

Accepted Answer

A)  Range
B)  Mode
C)  Mean
D)  Median

Exam 3: Descriptive Statistics: Numerical Methods

In a given data set the 25^th percentile is _______________ equal the lower hinge.

In a hearing test,subjects estimate the loudness (in decibels) of sound,and the results are;68,67,70,71,68,75,68,62,80,73,68 What is the IQR?

Quality control is an important issue at ACME Company which manufactures light bulbs.In order to conduct testing of the life hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted.378,361,350,375,200,391,375,368,321 What are the outer fences?

Quality control is an important issue at ACME Company which manufactures light bulbs.In order to conduct testing of the life hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted.378,361,350,375,200,391,375,368,321 What is the 65^th percentile?

In a statistic class,10 scores were randomly selected with the following results were obtained: 74,73,77,77,71,68,65,77,67,66 What is the 65^th percentile?

In a statistic class,10 scores were randomly selected with the following results were obtained: 74,73,77,77,71,68,65,77,67,66 What is the third quartile?

In a hearing test,subjects estimate the loudness (in decibels) of sound,and the results are (mean = 70) : 68,67,70,71,68,75,68,62,80,73,68 What is the standard deviation?

If one intends to compare the relative variation between two samples involving two different quantitative variables with different measurement scales,then the most appropriate way is to compare the two samples:

If the mean,median,and mode for a given population all equal 25,then we Know that its distribution is

In a statistic class,10 scores were randomly selected with the following results were obtained: 74,73,77,77,71,68,65,77,67,66 What is the median?

In a survey of 550 randomly-selected college statistic students were surveyed on their impressions of their course,instructor and textbook.The results are as follows: Compute a point estimate of the proportion of all college statistic students who think their instructor was "very effective"

As a measure of variation,the sample _________ is easy to understand and compute.It is based on the two extreme values and is therefore a highly unstable measure.

The range of the measurement is the largest measurement plus the small measurement.

In a study of employee stock ownership plans,data was collected at seven companies on satisfaction with the plan and the amount of organization commitment. It can be shown that for these data: , ^, , Calculate the sample covariance.

All of the following are measures of central tendency except the

Exam 3: Descriptive Statistics: Numerical Methods

In a given data set the 25th percentile is _______________ equal the lower hinge.

In a hearing test,subjects estimate the loudness (in decibels) of sound,and the results are;68,67,70,71,68,75,68,62,80,73,68 What is the IQR?

Quality control is an important issue at ACME Company which manufactures light bulbs.In order to conduct testing of the life hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted.378,361,350,375,200,391,375,368,321 What are the outer fences?

Quality control is an important issue at ACME Company which manufactures light bulbs.In order to conduct testing of the life hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted.378,361,350,375,200,391,375,368,321 What is the 65th percentile?

In a statistic class,10 scores were randomly selected with the following results were obtained: 74,73,77,77,71,68,65,77,67,66 What is the 65th percentile?

In a statistic class,10 scores were randomly selected with the following results were obtained: 74,73,77,77,71,68,65,77,67,66 What is the third quartile?

In a hearing test,subjects estimate the loudness (in decibels) of sound,and the results are (mean = 70) : 68,67,70,71,68,75,68,62,80,73,68 What is the standard deviation?

If one intends to compare the relative variation between two samples involving two different quantitative variables with different measurement scales,then the most appropriate way is to compare the two samples:

If the mean,median,and mode for a given population all equal 25,then we Know that its distribution is

In a statistic class,10 scores were randomly selected with the following results were obtained: 74,73,77,77,71,68,65,77,67,66 What is the median?

In a survey of 550 randomly-selected college statistic students were surveyed on their impressions of their course,instructor and textbook.The results are as follows: Compute a point estimate of the proportion of all college statistic students who think their instructor was "very effective"

As a measure of variation,the sample _________ is easy to understand and compute.It is based on the two extreme values and is therefore a highly unstable measure.

The range of the measurement is the largest measurement plus the small measurement.

In a study of employee stock ownership plans,data was collected at seven companies on satisfaction with the plan and the amount of organization commitment. It can be shown that for these data: , , , Calculate the sample covariance.

All of the following are measures of central tendency except the

In a given data set the 25^th percentile is _______________ equal the lower hinge.

Quality control is an important issue at ACME Company which manufactures light bulbs.In order to conduct testing of the life hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted.378,361,350,375,200,391,375,368,321 What is the 65^th percentile?

In a statistic class,10 scores were randomly selected with the following results were obtained: 74,73,77,77,71,68,65,77,67,66 What is the 65^th percentile?

In a study of employee stock ownership plans,data was collected at seven companies on satisfaction with the plan and the amount of organization commitment. It can be shown that for these data: , ^, , Calculate the sample covariance.