Filters
Question type
Study Flashcards

What is a disadvantage of the range as a measure of dispersion?


A) Based on only two observations
B) Can be distorted by a large mean
C) Not in the same units as the original data
D) Has no disadvantage
E) None of the choices are correct.

F) A) and B)
G) A) and E)

Correct Answer

verifed

verified

i. In a positively skewed distribution, the mean is always greater than the median. ii. In a negatively skewed distribution, the median occurs at the peak of the curve. iii. In a negatively skewed distribution, the mode is greater than the median.


A) (i) , (ii) and (iii) are all correct statements
B) (i) and, (ii) are correct statements but not (iii) .
C) (i) and, (iii) are correct statements but not (ii) .
D) (i) is a correct statement, but not (ii) or (iii) .
E) All statements are false

F) C) and D)
G) B) and D)

Correct Answer

verifed

verified

What is the relationship between the variance and the standard deviation?


A) Variance is the square root of the standard deviation
B) Variance is the square of the standard deviation
C) Variance is twice the standard deviation
D) No constant relationship between the variance and the standard deviation
E) None of the choices are correct.

F) A) and E)
G) A) and B)

Correct Answer

verifed

verified

A research analyst wants to compare the dispersion in the price-earnings ratios for a group of common stock with their return on investment. For the price-earnings ratios, the mean is 10.9 and the standard deviation is 1.8. The mean return on investment is 25 percent and the standard deviation 5.2 percent. What is the relative dispersion for the price-earnings ratios and return on investment?


A) Ratios = 32.0 percent, investment = 19.0 percent
B) Ratios = 16.5 percent, investment = 20.8 percent
C) Ratios = 132.0 percent, investment = 190.0 percent
D) Ratios = 50.0 percent, investment = 10.0 percent
E) None of the choices are correct.

F) All of the above
G) B) and C)

Correct Answer

verifed

verified

What is the relationship among the mean, median and mode in a symmetric distribution?


A) All equal
B) Mean is always the smallest value
C) Mean is always the largest value
D) Mode is the largest value
E) None of the choices are correct.

F) A) and D)
G) B) and E)

Correct Answer

verifed

verified

Each person who applies for an assembly job at Robert's Electronics is given a mechanical aptitude test. One part of the test involves assembling a plug-in unit based on numbered instructions. A sample of the length of time it took 42 persons to assemble the unit was organized into the following frequency distribution. Each person who applies for an assembly job at Robert's Electronics is given a mechanical aptitude test. One part of the test involves assembling a plug-in unit based on numbered instructions. A sample of the length of time it took 42 persons to assemble the unit was organized into the following frequency distribution. What is the standard deviation (in minutes) ? A) 3.89 B) 6.01 C) 8.78 D) 17.00 E) None of the choices are correct. What is the standard deviation (in minutes) ?


A) 3.89
B) 6.01
C) 8.78
D) 17.00
E) None of the choices are correct.

F) A) and B)
G) A) and C)

Correct Answer

verifed

verified

Listed below is the average earnings ratio by sex for full-year, full-time workers from 1999 to 2008. (Source: Adapted from Statistics Canada-see Connect for data file.) Listed below is the average earnings ratio by sex for full-year, full-time workers from 1999 to 2008. (Source: Adapted from Statistics Canada-see Connect for data file.) What were the modal earnings for women for the years 1999-2008? A) $27,000 B) $27,600 C) $27,900 D) $28,320 E) $28,600 What were the modal earnings for women for the years 1999-2008?


A) $27,000
B) $27,600
C) $27,900
D) $28,320
E) $28,600

F) C) and E)
G) A) and E)

Correct Answer

verifed

verified

Listed below is the average earnings ratio by sex for full-year, full-time workers from 1999 to 2008. (Source: Adapted from Statistics Canada-see Connect for data file.) Listed below is the average earnings ratio by sex for full-year, full-time workers from 1999 to 2008. (Source: Adapted from Statistics Canada-see Connect for data file.) What were the modal earnings for men for the years 1999-2008? A) $43,000 B) $44,400 C) $44,500 D) $44,600 E) $44,700 What were the modal earnings for men for the years 1999-2008?


A) $43,000
B) $44,400
C) $44,500
D) $44,600
E) $44,700

F) B) and E)
G) B) and D)

Correct Answer

verifed

verified

Determine the age of the oldest person who died in this sample.


A) 37.3
B) 39.5
C) 44.9
D) 76.8
E) None of the choices are correct.

F) All of the above
G) A) and B)

Correct Answer

verifed

verified

i. In a negatively skewed distribution, the mean is always greater than the median. ii. In a negatively skewed distribution, the median occurs at the peak of the curve. iii. In a positively skewed distribution, the mode is greater than the median.


A) (i) , (ii) and (iii) are all correct statements
B) (i) and, (ii) are correct statements but not (iii) .
C) (i) and, (iii) are correct statements but not (ii) .
D) (i) is a correct statement, but not (ii) or (iii) .
E) All statements are false

F) A) and B)
G) A) and C)

Correct Answer

verifed

verified

The Investment Company Institute reported in its Mutual Fund Fact Book that the number of mutual funds increased from 410 in 1990 to 857 in 2000. What is the geometric mean annual percent increase in the number of funds?


A) 1.12
B) 7.65
C) 19.41
D) 48.66
E) None of the choices are correct.

F) A) and E)
G) A) and D)

Correct Answer

verifed

verified

The following are the weekly amounts of welfare payments made by the federal government to a sample of six families: $139, $136, $130, $136, $147 and $136. What is the range?


A) $0
B) $14
C) $52
D) $17
E) None of the choices are correct.

F) B) and C)
G) B) and D)

Correct Answer

verifed

verified

The mean, as a measure of central tendency, would be inappropriate for which one of the following?


A) Ages of adults at a senior citizen center
B) Incomes of lawyers
C) Number of pages in textbooks on statistics
D) Marital status of college students at a particular university
E) None of the choices are correct.

F) A) and B)
G) B) and D)

Correct Answer

verifed

verified

Which one of the following is referred to as the population mean?


A) Statistic
B) µ
C) Sample
D) ∑
E) None of the choices are correct.

F) B) and E)
G) B) and D)

Correct Answer

verifed

verified

A study has been made of the number of hours a light bulb will operate before it burns out. If the variance of this distribution were computed, it would be measured in ________.

Correct Answer

verifed

verified

If a major sports star were to move into your neighbourhood, what would you expect to happen to the neighbourhood's "average" income?


A) The mean income would decrease significantly
B) The median income would increase significantly
C) The modal income would increase significantly
D) The mean income would increase significantly, but the median income would stay almost the same as before
E) The standard deviation of the neighbourhood's income would get smaller

F) A) and D)
G) A) and E)

Correct Answer

verifed

verified

A sample of assistant professors on the business faculty at the largest college in Ontario revealed the mean annual income to be $32,000 with a standard deviation of $3,000. Using the Empirical Rule, what proportion of faculty earn more than $26,000 but less than $38,000?


A) At least 50%
B) Approximately 68%
C) At least 75%
D) Approximately 95%
E) Almost all

F) C) and E)
G) None of the above

Correct Answer

verifed

verified

Describe the shape of the age of death distribution.


A) Slight positive skewness
B) Slight negative skewness
C) Perfectly symmetrical
D) You cannot determine this from the data given
E) Strong negative skewness

F) B) and D)
G) All of the above

Correct Answer

verifed

verified

i. The standard deviation is the positive square root of the variance. ii. For a symmetrical distribution, the variance is equal to the standard deviation. Iii) If the standard deviation of the ages of a female group of employees is six years and the standard deviation of the ages of a male group in the same plant is ten years, it indicates that there is more spread in the ages of the female employees.


A) (i) , (ii) and (iii) are all correct statements
B) (i) and, (ii) are correct statements but not (iii) .
C) (i) and, (iii) are correct statements but not (ii) .
D) (i) is a correct statement, but not (ii) or (iii) .
E) All statements are false

F) A) and B)
G) A) and C)

Correct Answer

verifed

verified

A sample of the daily production of transceivers was organized into the following distribution. A sample of the daily production of transceivers was organized into the following distribution. What is the mean daily production? A) 106.4 B) 101.4 C) 111.4 D) 105.0 E) 20.0 What is the mean daily production?


A) 106.4
B) 101.4
C) 111.4
D) 105.0
E) 20.0

F) B) and E)
G) A) and B)

Correct Answer

verifed

verified

Showing 41 - 60 of 186

Related Exams

Exam 1

What Is Statistics

78 Questions

Exam 2

Describing Data: Frequency Distributions and Graphic Presentation

101 Questions

Exam 4

A Survey of Probability Concepts

121 Questions

Exam 5

Discrete Probability Distributions

111 Questions

Exam 6

The Normal Probability Distribution

129 Questions

Exam 7

Sampling Methods and the Central Limit Theorem

78 Questions

Exam 8

Estimation and Confidence Intervals

128 Questions

Exam 9

One-Sample Tests of a Hypothesis

223 Questions

Exam 10

Two-Sample Tests of Hypothesis

87 Questions

Exam 11

Analysis of Variance

80 Questions

Exam 12

Linear Regression and Correlation

150 Questions

Exam 13

Multiple Regression and Correlation Analysis

98 Questions

Exam 14

Chi-Square Applications for Nominal Data

113 Questions

Exam 15

Index Numbers

65 Questions

Exam 16

Time Series and Forecasting

86 Questions

Exam 17

An Introduction to Decision Theory

37 Questions

Show Answer