INFORMATION STATISTICS IN DECISION MAKING

QUESTION 1

1. If you add the number of independent variables and dependent variables in a 2 x 2 factorial ANOVA, the sum is

A. one

B. two

C. three

D. four
QUESTION 2

1. A factorial ANOVA and an independent-samples t test have the same

A. number of independent variables;

B. capability to measure an interaction;

C. number of independent variables and capability to measure an interaction;

D. neither number of independent variables nor capability to measure an interaction.

QUESTION 3

1. In testing for a main effect using a factorial ANOVA, the null hypothesis is that the populations from which the samples were drawn

A. are identical;

B. have equal variances;

C. are normally distributed;

D. all of the other alternatives are correct.
QUESTION 4

1. The restriction that is built into the calculation of the standard error of the mean, the restriction that costs one degree of freedom, is Σ(X – ) = 0; that samples must be random; that statistics are never as accurate as parameters; none of the other alternatives are correct.

QUESTION 5

1. Suppose the difference between a sample mean and the null hypothesis mean was in the rejection region of the sampling distribution. This means that the difference is

A. probably the result of mistakes;

B. unreasonable; it is either too large or too small;

C. probably due to chance;

D. probably not due to chance.

QUESTION 6

1. When independent samples with unknown but equal standard deviations are used to test for differences in the means, we pool the sample _____.

QUESTION 7

1. If samples taken from two populations are dependent, then a test of __ differences is applied.

QUESTION 8

1. The p-value is determined by the value of a __________.

QUESTION 9

1. For populations scattered in a wide area, the preferred technique for sampling is _.

QUESTION 10

1. Affirmative action commitments by many organizations have led to an increase in the number of women in executive positions. Satellite Office Systems has vacancies for two executives that it will fill from among four women and six men.

To do this, the _ probability distribution should be applied.

QUESTION 11

1. A probability distribution shows the distribution of a __.

QUESTION 12

1. When the special rule of addition is used, the events must be ___.

QUESTION 13

1. To summarize the frequencies of two nominal or ordinal variables and compute conditional probabilities, a _ can be used.

QUESTION 14

1. When classes in a frequency table are constructed so that each observation will fit into only one class, the categories are __________.

QUESTION 15

1. A statistics professor wants to compare grades in two different classes of the same course. This is an example of _ populations.