Test 4 Flashcards

1
Q

Tabulation refers to the orderly arrangement of data in a summary format.

A

true

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2
Q

Choosing the right statistic boils down to what type and how many variables are involved in a particular research question or hypothesis.

A

true

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3
Q

In a regression equation, the beta coefficients indicate the effect on the dependent variable of a 1-unit increase in any of the independent variables.

A

true

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4
Q

The purpose of a table in a research report is to summarize and communicate the meaning of the data to the reader.

A

true

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5
Q

Multivariate statistical analysis permits the researcher to consider more than one dependent variable at the same time.

A

true

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6
Q

The main reason a large sample size is desirable is that sample size is related to random sampling error.

A

true

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7
Q

In multiple regression, the dependent variable must be continuous and interval-scaled.

A

true

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8
Q

Cross-tabulation allows the inspection and comparison of differences among groups based on nominal or ordinal categories.

A

True

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9
Q

The t-test is appropriate for small sample sizes with unknown standard deviations.

A

true

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10
Q

Coding involves assigning some representative value to units of data having similar meaning.

A

true

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11
Q

When the difference between two groups is measured, bivariate statistics are used.

A

true

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12
Q

One hundred percent of the scores in a normal distribution fall within plus or minus two standard deviations of the mean.

A

false

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13
Q

A Type II error occurs when the researcher rejects the null hypothesis when, in fact, it is true.

A

false

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14
Q

In a regression equation, the slope of the line, , is the change in X that is due to a corresponding change of one unit of Y.

A

false

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15
Q

Multiple regression analysis includes a single independent variable but several dependent variables.

A

false

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16
Q

Nonresponse bias causes problems because it means that the sampling units that participated are different from those that did not participate.

A

truw

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17
Q

The mode is the measure of central tendency that identifies the value that occurs most often.

A

true

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18
Q

The row and column totals in a contingency table are called subtotals because they are less than the total.

A

false

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19
Q

If a researcher is interested in whether adult males purchase a product more frequently than adult females, univariate statistics would be used in the analysis of data.

A

false

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20
Q

ANOVA and Linear Regression are among the most common forms of the general linear model (GLM).

A

true

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21
Q

What are some of the most common statistical software packages?

A

SPSS, SAS, and EXCEL

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22
Q

What is another form of the alternative hypothesis when testing the difference between the means of the two groups?

A

*b. u1 - u2 not equal 0

23
Q

Which analysis is portrayed by the equation: Y = bo + 1X1 + 2X2 + 3X3… + nXn?

A

multiple regression

24
Q

look at formula for variance

A
25
Q

When students tardiness is used to predict the test performance of students in a regression equation, student tardiness is the ____ variable and test performance is the ____ variable.

A

independent, dependent

25
Q

Failing to identify a hypothesized difference using a sample result when a difference really does exist in the population is a ____ error.

A

type 2

26
Q

All of the following are characteristics of the standardized normal distribution EXCEPT that it ____.

A

has a mean of 1 and a standard deviation of 0

27
Q

What is the first step in interpreting a multiple regression model?

A

Examine the model F-test.

27
Q

What is the most useful distribution in inferential statistics?

A

standardized normal distribution

28
Q

A study compares the means of two groups in which there are 45 males in Group 1 and 37 females in Group 2. The degrees of freedom for this study when using the t-test for the difference between means is ____.

A

80

29
Q
  1. In the regression equation, Y = a +  X, a is the symbol for the ____.
A

a = y-int of regression line

30
Q

Suppose the price of MP3 players in Denver range from $59 to $179. Then, the range of these prices is ____.

A

120

31
Q

Suppose the price of MP3 players in Denver range from $59 to $179. Then, the range of these prices is ____.

A

S

32
Q

When a researcher wants to estimate national market share based on the results of the test market for a new product in St. Louis and Kansas City, this is an example of:

A

inferential stats

33
Q

Counting the different ways respondents answered a question and arranging them in a simple summary form yields a(n) ____.

A

marginal tabulation

34
Q

In the regression equation, Y = a +  X ,  is the ____.

A

B is the slope of the line

35
Q

In comparing the difference of the means between two groups, the null hypothesis can also be stated as ____.

A

u1 + u2 = 0

36
Q

In a test marked study, 206 out of a sample of 560 people state that they “liked” the product being studied. The proportion of people in this study who said that they liked this product was about:

A

.37

37
Q

look at x^2 test

A
38
Q

The midpoint of a set of numbers is referred to as the _____.

A

median

39
Q

________ statistics allow inferences about a whole population from a sample.

A

inferential

40
Q

________ is the long-run relative frequency with which an event will occur.

A

probability

41
Q

_______ is the distance between the smallest and the largest values of a frequency distribution.

A

range

42
Q

________ is a graphical way of showing the frequency distribution in which the height of a bar corresponds to the frequency of a category.

A

histogram

42
Q

_______ statistical analysis tests hypotheses involving two variables.

A

bivariante

43
Q
  1. Type ___ error occurs when a condition that is really true in the population is rejected based on statistical observations.
A

one

44
Q
  1. Type ____ error occurs when a condition that is not true in the population is accepted based on statistical observations.
A

two

44
Q

______ test involves comparing the observed frequencies with the expected frequencies in each cell of the table.

A

CHi-Square

44
Q
A
45
Q
  1. ANOVA stands for ______
A

Analysis of Variance.

46
Q
A
47
Q
A
48
Q
A
48
Q
A