## Statistics for the Behavioral Sciences Study Set 5

Psychology

## Quiz 12 :

One-Way Between-Groups Anova

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Q04 Q04 Q04

If the p level is.0.05 and the null hypothesis is true, the probability of making a Type I error when performing a single hypothesis test is _____, but if three hypothesis tests are performed, then the probability of NOT making a Type I error is _____, which means that the probability of making a Type I error at least once in these three hypothesis tests is _____.

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Q12 Q12 Q12

Interested in the effects of different kinds of instruction on video game performance, Martin asks 30 college freshmen to each play one hour of Ratchet and Klank.Participants are randomly assigned to one of three instruction groups: (1) complete the tasks as quickly as possible, (2) conserve as much health as possible find gold bolts (worth lots of money in equipment and ammunition).If Martin averages the scores for each instruction group and then compares them, any differences in the means of the instruction groups reflect:

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Q13 Q13 Q13

Interested in the effects of different kinds of instruction on video game performance, Martin asks 30 college freshmen to each play one hour of Ratchet and Klank..Participants are randomly assigned to one of three instruction groups: (1) complete the tasks as quickly as possible, (2) conserve as much health as possible find gold bolts (worth lots of money in equipment and ammunition).Obviously, even in a single instruction group, not all players will obtain the same final score.These differences in an instruction group reflect:

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Multiple Choice

Q42 Q42 Q42

Lucille is interested in the effects of alcohol consumption on style of play while playing the video game Sims.She asks a group of 15 college students to play Sims under one of the following conditions: no alcohol, 1 ounce of alcohol, 2 ounces of alcohol, or 3 ounces of alcohol.Lucille measures on a scale of 1 to 10 how prosocial the students' style of play is.After collecting the data, Lucille performs an ANOVA and finds that she can reject the null hypothesis.On this basis, what does Lucille know?

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Multiple Choice

Q87 Q87 Q87

A researcher compares bone density in retired professional athletes across three different sports.He computes a series of three t tests to examine all between-group differences, running each test with a p level of 0.01.What is the probability of a Type I error when making these comparisons?

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Multiple Choice

Q89 Q89 Q89

Clara works for an advertising firm and needs to understand how an individual's levels of experience with cooking (novice, intermediate, or expert) affect how he or she will rate a new group of cookware advertisements.What type of design would be best for Clara to use?

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Multiple Choice

Q91 Q91 Q91

Bernard thinks some college students spend more money during the semester than others, and that this difference is related to the students' majors.He wants to compare the total amount of money spent at the end of one semester by American college students who major in psychology to that spent by history or physics majors.What is the second step Bernard should follow for testing his hypothesis?

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Multiple Choice

Q92 Q92 Q92

A researcher compares depression levels of people residing in five different climate regions.She collects data from 15 randomly selected people in each region.If she compares her groups using a between-groups, one-way ANOVA at a p level of 0.05, the critical value for her F statistic would be:

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Multiple Choice

Q96 Q96 Q96

Ana is comparing spatial ability scores for four groups.She finds that the F statistic for her test is 4.01, and the cutoff value she identified prior to her analysis was 3.45.Should Ana reject or fail to reject the null hypothesis and what, if any, other steps does she need to take?

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Multiple Choice

Q102 Q102 Q102

Henry is examining the effectiveness of using scare tactics to manipulate the behaviors of people living on the same island but in different regions, categorized as the beach, the valley, and the mountains.What is the first step Henry should follow for hypothesis testing?

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Multiple Choice

Q104 Q104 Q104

A researcher found a significant result using a one-way ANOVA to compare the mean of four age groups (3 years old, 5 years old, 8 years old, and 12 years old) on a test of language ability.What specific conclusions can the researcher draw from this result?

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Multiple Choice

Q107 Q107 Q107

A Tukey HSD is computed to compare two groups following an ANOVA that compared five groups.The within-groups degrees of freedom for the test are 7, and the computed HSD value is 6.24.What could be concluded about this analysis if evaluated at a p level of 0.05?

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