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Exam 13: Understanding Research Results: Statistical-Inference Basics

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Question 31

Multiple Choice

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The appropriate statistical test for interval or ratio level data derived from measuring the dependent variable (for more than two groups) is the

A) t-test.
B) Pearson correlation.
C) chi-square.
D) F test (analysis of variance) .

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Question 32

Multiple Choice

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The expected value of t if the null hypothesis is true would

A) equal 1.
B) equal 0.
C) depend on the degrees of freedom.
D) vary depending on the alpha level.

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Question 33

Multiple Choice

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A researcher employs inferential statistics to examine the difference in mean scores obtained by fourth grade boys and girls on a standardized math test.Inferential statistics

The _____ the t or F ratio,the more likely the results are _____.

A researcher asked participants to rate the softness of two well-known brands of toilet tissue: Fuzzy and Luvvy.Fuzzy was rated softer than Luvvy with mean ratings of 5.50 and 3.25,respectively.This difference was statistically significant at the .05 probability level.The null hypothesis for the population was that

Jenny reports that individuals who follow her diet plan lose more weight than individuals who follow Richard's diet plan.In actuality,there is no difference in weight loss between those on Jenny's versus those on Richard's plan.Jenny's claim illustrates a _____ error.

Which of the following is least correct regarding a Type II error? The probability of making a Type II error is

In comparing differences in ratings of responsibility for an automobile accident between male and female drivers,the null hypothesis would be

Your lab group must choose a significance test to determine if the mean scores of two groups are significantly different.The appropriate test is a(n)

The appropriate statistical test for nominal level data derived from measuring the dependent variable (for two groups) is

The statement that the independent variable had no effect is called the ________ hypothesis.

Which of the following is least correct regarding the use of statistical tests?

Which statistical test would be most appropriate to examine the relationship between daily temperature and number of ice cream cones sold during the month of July?

The research hypothesis states that the

The null hypothesis

Which significance level would minimize the probability of a Type I error?

If we say we have statistically significant results,we mean the results are

A student is interested in the effect of environmental condition on task performance.She has participants complete a series of math problems under different temperatures (cold,warm,hot) and noise condition (quiet,noisy) .The most appropriate test to analyze the data would be a(n)

A sampling distribution is a distribution of the kinds of outcomes one expects if the ________ hypothesis is ________.

How does sample size affect determinations of statistical significance? The ______ the sample,the _______.