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36 Cards in this Set
- Front
- Back
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Fred has concluded that there is no difference in driving ability between drivers who have consumed one versus three cans of beer. However, there really is a difference in ability between the drivers. Fred has made an
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Type ll
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The purpose of using factorial designs is to:
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To compare means of more than 2 IV’s
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A consumer analyst asks participants to rate the comfort of the ride for two brands of all-terrain tires: Trail Cushion and Mud Handler. Trail Cushion was rated more comfortable with a mean of 5.5 than Mud Handler with a mean of 4.3. The Type II error would be to conclude that Trail Cushion was
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no more comfortable than Mud Handler when Trail Cushion is actually more comfortable .
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A researcher interested in the use of discipline practices by males versus females predicted that men would use power-oriented practices more frequently than women. The research or experimental hypothesis would be that
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Men use power techniques more than women.
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Rejecting the null hypothesis when it is true is called a _________ error, whereas, not rejecting a false null hypothesis is called a ___________error.
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Type l; Type ll
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In testing differences between means, the_____________ hypothesis would suggest any observed difference is due to_____________.
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null; random error
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Choosing a sample size should be dictated by
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A type II error is a decision to
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A manipulation check is especially important when
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_______ is a type of correlation coefficient that indicates the_______ the effect of the independent variable.
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Effect size r; magnitude of
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How do you calculate systematic variance?
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Find the deviation of the group means about the grand mean.
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Which of the following is least correct regarding a type II error? The probability of making a type II error is
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?
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Results are generally said to be statistically significant when there is a________ probability of the results occurring if the population means are equally actually equal.
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low
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The likelihood of recurrence of some event or outcome is referred to as
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Probability
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A researcher employees inferential statistics to examine the difference in mean scores obtained by fourth-grade boys and girls on a standardized math test inferential statistics
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Indicate the probability that the difference between means reflect random error.
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What is the difference between descriptive and inferential statistics? Descriptive statistics__________ while inferential statistics_____________.
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Inferential statistics are techniques that allow us to use these samples to make generalizations about the populations from which the samples were drawn.
descriptive statistics provide information about our immediate group of data. |
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A type l error is a decision to
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reject the null hypothesis when it is true
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Confidence intervals are often calculated when examining differences between means. The confidence interval
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Imagine that a survey reports that 57% of individuals preferred the Democratic candidate and that 43% report that they prefer the Republican candidate. The survey reports a confidence interval, 95% + /-3. What can we conclude from these results?
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That we have a 95% chance of making incorrect prediction about the election.
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A nonsignificant (negative) result may be caused by a
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All the above
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Juan wants to test the hypothesis that the mean amount of sales dollars will vary between Oak Ridge, Oak Wood, and Oak Park shopping malls. The appropriate statistical tests would be the
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Analysis of variance (ANOVA).
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Error variance is the deviation of
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The individual scores about the group mean.
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A researcher is interested in studying whether responses to lowering the legal age for drinking alcohol (for or against) varies by gender (male or female). Which statistical test would be most appropriate for this type of data?
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Chi Square
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The expected value of t if the null hypothesis is true, would
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?
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The desired probability of correctly rejecting the null hypothesis is the
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Power of the test.
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Which of the following is least correct regarding a type II error? The probability of making a type II error is
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Equal to your alpha level
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In testing differences between means, the_________ hypothesis would suggest the population means are different.
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?
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The_____________ refers to the strength of association between variables.
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Effect size
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Which statistical test would be most appropriate to examine the relationship between temperature and number of ice cream cones sold during the month of July?
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Pearson correlation
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With 3 independent variables and a single dependent variable, you the most appropriate statistical tests to analyze the data would be an
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analysis of variance
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In an experiment, one group of research participants is given 10 pages of material to proofread for errors. Another group who freeze the same material on the computer screen. The DV is the number of errors detected in a 5-minute period. What statistical test would you use?
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Independent (between) samples T-tasks.
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The researcher wants to determine if cholesterol level is lower for vegetarians vs. nonvegetarians. But statistical test would be most appropriate to analyze the data?
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T-test.
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An interaction occurs whenever
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The effect of one independent variable changes across levels of the 2nd independent variable.
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In a factorial design, a main effect is the effect of the____________ variable by itself.
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Independent
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Which statement is true for factorial design?
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All levels of each independent variable are combined with all levels of other independent variable.
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The purpose of using factorial designs is to:
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Compare means of more than 2 independent variables.
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