1246 words - 5 pages

QNT/351

UoP

November 2013

1) The main purpose of descriptive statistics is to

A. summarize data in a useful and informative manner

B. make inferences about a population

C. determine if the data adequately represents the population

D. gather or collect data

The answer is A

2) The general process of gathering, organizing, summarizing, analyzing, and interpreting data is called

A. statistics

B. descriptive statistics

C. inferential statistics

D. levels of measurement

The answer is A

3) The performance of personal and business investments is measured as a

percentage, return on investment. What type of variable is return on

investment?

A. Qualitative

B. Continuous

...view middle of the document...

Raw data

The answer is D

10) The sum of the deviations of each data value from this measure of central location will always be 0

A. Mode

B. Mean

C. Median

D. Standard deviation

The answer is B

11) For any data set, which measures of central location have only one value?

A. Mode and median

B. Mode and mean

C. Mode and standard deviation

D. Mean and median

The answer is D

12) A sample of single persons receiving social security payments

revealed these monthly benefits: $826, $699, $1,087, $880, $839, and

$965. How many observations are below the median?

A. 0

B. 1

C. 2

D. 3

The answer is D

13) A dot plot shows

A. the general shape of a distribution

B. the mean, median, and mode

C. the relationship between two variables

D. the interquartile range

The answer is A

14) The test scores for a class of 147 students are computed. What is

the location of the test score associated with the third quartile?

A. 111

B. 37

C. 74

D. 75%

The answer is A

15) The National Center for Health Statistics reported that of every 883

deaths in recent years, 24 resulted from an automobile accident, 182

from cancer, and 333 from heart disease. Using the relative frequency

approach, what is the probability that a particular death is due to an

automobile accident?

A. 24/883 or 0.027

B. 539/883 or 0.610

C. 24/333 or 0.072

D. 182/883 or 0.206

The answer is A

16) If two events A and B are mutually exclusive, what does the special rule of addition state?

A. P(A or B) = P(A) + P(B)

B. P(A and B) = P(A) + P(B)

C. P(A and/or B) = P(A) + P(B)

D. P(A or B) = P(A) - P(B)

The answer is A

17) A listing of all possible outcomes of an experiment and their corresponding probability of occurrence is called a

A. random variable

B. probability distribution

C. subjective probability

D. frequency distribution

The answer is B

18) The shape of any uniform probability distribution is

A. negatively skewed

B. positively skewed

C. rectangular

D. bell shaped

The answer is C

19) The mean of any uniform probability distribution is

A. (b - a)/2

B. (a + b)/2

C. Σ x/ η

D. nπ

The answer is B

20) For the normal distribution, the mean plus and minus 1.96 standard

deviations will include about what percent of the observations?

A. 50%

B. 99.7%

C. 95%

D. 68%

The answer is C

21) For a standard normal distribution, what is the probability that z is greater than 1.75?

A. 0.0401

B. 0.0459

C. 0.4599

D....

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