test 4 Flashcards
Tabulation refers to the orderly arrangement of data in a summary forma
true
Choosing the right statistic boils down to what type and how many variables are involved in a particular research
question or hypothesis
true
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
true
The purpose of a table in a research report is to summarize and communicate the meaning of the data to the reader
true
Multivariate statistical analysis permits the researcher to consider more than one dependent variable at the same time
true
The main reason a large sample size is desirable is that sample size is related to random sampling error
true
In multiple regression, the dependent variable must be continuous and interval-scaled
true
Cross-tabulation allows the inspection and comparison of differences among groups based on nominal or ordinal
categories
true
The t-test is appropriate for small sample sizes with unknown standard deviations
true
Coding involves assigning some representative value to units of data having similar meaning
true
When the difference between two groups is measured, bivariate statistics are used.
true
One hundred percent of the scores in a normal distribution fall within plus or minus two standard deviations of the
mean
false
A Type II error occurs when the researcher rejects the null hypothesis when, in fact, it is true
false
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
false
Multiple regression analysis includes a single independent variable but several dependent variables
false
Nonresponse bias causes problems because it means that the sampling units that participated are different from those
that did not participate
true
The mode is the measure of central tendency that identifies the value that occurs most often
true
The row and column totals in a contingency table are called subtotals because they are less than the total
false
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
false
ANOVA and Linear Regression are among the most common forms of the general linear model (GLM)
true
What are some of the most common statistical software packages?
SPSS, SAS and EXCEL
What is another form of the alternative hypothesis when testing the difference between the means of the two groups?
1 - 2 0
Which analysis is portrayed by the equation:
multiple regression
The formula below is used to compute
variance
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
independent; dependent
Failing to identify a hypothesized difference using a sample result when a difference really does exist in the
population is a ____ error
type II
All of the following are characteristics of the standardized normal distribution EXCEPT that it ____
has a mean of 1 and a standard deviation of 0
What is the first step in interpreting a multiple regression model?
Examine the model F-test
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 ___
80
What is the most useful distribution in inferential statistics
standardized normal distribution
In the regression equation, Y = a +
X, a is the symbol for the ___
intercept of the regression line
Suppose the price of MP3 players in Denver range from $59 to $179. Then, the range of these prices is __
120
Which of the following is the symbol for the sample standard deviation?
S
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:
Inferential statistics
Counting the different ways respondents answered a question and arranging them in a simple summary form yields
a(n) ____
marginal tabulation
In the regression equation, Y = a +
B X ,
B is the
slope of the regression line
In comparing the difference of the means between two groups, the null hypothesis can also be stated as ____
u1 - u2 = 0
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:
37
The formula given below represents the method for calculating the
x2 test
The midpoint of a set of numbers is referred to as the __
median
