question

When the point in a scatter plot cluster closely around the regression line, the correlation can be

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strong.

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In a hypothesis test, which of the following will cause a decrease in B, the probability of making a type II error?

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A: increasing x while keeping the sample size n, fixed B: Increasing the sample size n, while keeping x fixed A and B

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The owner of a football team claims that the average attendance at games is over 70,400, and he is therefore justified in moving the team to a city with a larger stadium. Identify the type II error for the test.

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The error of failing to reject the claim that the mean attendance is at most 70,400, when it is actually greater than 70,400.

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The principal of a middle school claims that test scores of the seventh-graders at his school vary less than the test scores of the seventh-graders at a neighboring school, which have variation described by x=14.7. Identify the type I error for the test.

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The error of rejecting the claim that the standard deviation is less than 14.7 when it really is less than 14.7.

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The variable being predicted in a regression analysis is called the:

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dependent variable

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question

a researcher claims that the amounts of acetaminophen in a certain brand of cold tablets have a standard deviation different from the o= 3.3 mg claimed by the manufacturer. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure to reject the null hypothesis, state the conclusion in nontechnical terms.

answer

There is not sufficient evidence to support the claim that the standard deviation is different from 3.3mg.

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question

A cereal company claims that the mean weight of the cereal in its packets is at least 14 oz. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is to reject the null hypothesis, state the conclusion in nontechnical terms.

answer

There is sufficient evidence to warrant rejection of the claim that the mean weight is at least 14 oz.

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question

In what section of a research article should the authors describe each analysis in a systematic fashion?

answer

methods

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question

When conducting a t test for independent means, a typical research hypothesis might be

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the mean of Population 1 is greater than the mean of Population 2

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a researcher claims that the amounts of acetaminophen in a certain brand of cold tablets have a standard deviation different from the o= 3.3 mg claimed by the manufacturer.

answer

Ho: o ==3.3mg Ha: o =/= 3.3mg

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question

a researcher claims that 62% of voters favor gun control.

answer

Ho: p ==0.62 Ha: p =/=0.62

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Before embarking on a new study, experienced researchers plan what statistical method(s) they will use when the study is complete. Why is it important to carry out this step?

answer

all of the above

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The set of frequencies obtained in an actual frequency distribution are the:

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observed frequencies

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The variation observed between group means is referred to as:

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between group variation.

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a regression line

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shows the relation between values of the predictor and criterion variables.

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question

Before running statistical analyses, researchers should check their data for:

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all of the above

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A chi-square test of significance is essentially concerned with:

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the distinction between expected and observed frequencies.

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question

The variation found among raw scores in a particular group is referred to as:

answer

within group variation.

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Once a researcher has an idea for a research question, the next step is to:

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develop a specific research plan to address the question

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question

Parametric tests require:

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a normal distribution

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In the Discussion section of a research article, one should:

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all of the above

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question

An analysis of variance differs from a t test for independent means in that an analysis of variance

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can be used to compare three or more groups, while a t test for independent means cannot be used to compare more than two groups.

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In a one-way analysis of variance with three groups, the null hypothesis states:

answer

at least two of the groups differ

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Regression analysis creates a mathematical function which predicts the value of the _______ on the basis of the __________________.

answer

dependent variable; independent variable

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Expected frequencies represent:

answer

the frequencies one would expect if the null hypothesis were true.

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question

In a regression analysis

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one variable is believed to be influenced by the other.

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question

A researcher takes a sample and wants to compare the results to the population from which it was drawn. The independent variable is "gender" and the dependent variable is a yes/no response to whether they favor the abortion. Which test would the researcher use to see if results are significant?

answer

a difference between means test

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question

Which of the following is the best way to reduce the variances in the distributions of means when conducting a t test for independent means?

answer

increasing the size of the samples

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question

Which of the following is not a component of the regression equation?

answer

error

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Mr. Ellis: Exam Review III – Flashcards

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