Test 4 Flashcards
Tabulation refers to the orderly arrangement of data in a summary format.
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.
truw
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?
*b. u1 - u2 not equal 0
Which analysis is portrayed by the equation: Y = bo + 1X1 + 2X2 + 3X3… + nXn?
multiple regression
look at formula for 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 2
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.
What is the most useful distribution in inferential statistics?
standardized normal distribution
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
- In the regression equation, Y = a + X, a is the symbol for the ____.
a = y-int of regression line
Suppose the price of MP3 players in Denver range from $59 to $179. Then, the range of these prices is ____.
120
Suppose the price of MP3 players in Denver range from $59 to $179. Then, the range of these prices is ____.
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 stats
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 + X , is the ____.
B is the slope of the 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
look at x^2 test
The midpoint of a set of numbers is referred to as the _____.
median
________ statistics allow inferences about a whole population from a sample.
inferential
________ is the long-run relative frequency with which an event will occur.
probability
_______ is the distance between the smallest and the largest values of a frequency distribution.
range
________ is a graphical way of showing the frequency distribution in which the height of a bar corresponds to the frequency of a category.
histogram
_______ statistical analysis tests hypotheses involving two variables.
bivariante
- Type ___ error occurs when a condition that is really true in the population is rejected based on statistical observations.
one
- Type ____ error occurs when a condition that is not true in the population is accepted based on statistical observations.
two
______ test involves comparing the observed frequencies with the expected frequencies in each cell of the table.
CHi-Square
- ANOVA stands for ______
Analysis of Variance.
