Web Quiz 1: Chapter 1 to 15

Web Quiz 1: Chapter 1 to 15

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Indicate the answer choice that best completes the statement or answers the question.

1. A value of 0 within the interval of a confidence interval may indicate:

• an error in the calculation.
• large sample sizes.
• no difference.
• a large confidence interval.

• A researcher is interested in finding the effect of the use of mobile phones and sleep deprivation on students'

exam performance. The result of a multiple regression analysis is as follows: intercept is = 83.03, slope (X1) = – 1.25, and slope (X2) = –1.29. Which of the following is the regression equation?

• = 83.03 – 1.25 (X1mobile phone) – 1.29(X2sleep)
• = 83.03 + 1.25 (X1mobile phone) + 1.29(X2sleep)
• = 83.03 + 1.25 (X1mobile phone) – 1.29(X2sleep)
• = 83.03 – 1.25 (X1mobile phone) + 1.29(X2sleep)

• A researcher sets up a study to examine how lecture comprehension of college students is affected by lecture

type (history, psychology, statistics, or English), classroom size (large or small), presentation method (blackboard, overhead projector, or computer), and instructor (graduate student, assistant professor, or full professor). How many cells are in this design?

• 4
• 12
• 24
• 72

• In Cohen's d, the farther apart the means of two distributions, the _____ the effect size, assuming the standard

deviation is held constant.

• more variable
• less variable
• larger
• smaller

• The _____ estimate acknowledges the amount of uncertainty in the _____ estimate by reporting the margin of

error.

• interval; standard error
• point; interval
• interval; point
• point; standard error

• India converts her raw score on a memory scale to a z score and finds that her score corresponds to a z score

(Essentials of Statistics for the Behavioral Sciences, 4e Susan Nolan, Thomas Heinzen) (Test Bank, Answer at the end of each Quiz) 1 / 4

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of –0.92. She knows her score is below the mean. What percent of people scored lower than India on the memory scale?

• 17.88%
• 32.12%
• 67.88%
• 82.12%

• A researcher wants to examine the effect of drugs and diet on systolic blood pressure. She randomly assigns

20 individuals with high blood pressure to one of four treatments: control (no diet or drugs), diet modification only, drug only, drug and diet modification. What type of design is appropriate for this study?

• one-way within-groups ANOVA
• two-way within-groups ANOVA
• two-way between-groups ANOVA
• mixed-design ANOVA

• 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 by the end of one semester by American college students who major in psychology to that spent by history or physics majors.What is the first step Bernard should follow for testing his hypothesis?

• Identify population 1 as all psychology majors, population 2 as all history majors, and population 3

as all physics majors.

• State the null hypothesis as college students majoring in psychology, history, or physics do not spend

the same amount of money during one semester on average. State the research hypothesis as college students majoring in psychology spend about the same amount of money during one semester on average as do history and physics majors.

• State the null hypothesis as college students majoring in psychology, history, or physics spend about

the same amount of money during one semester on average. State the research hypothesis as college students majoring in psychology, history, or physics do not spend the same amount of money during one semester on average.

• Identify the population as American college students, and randomly sample students until he has a

large enough group of psychology, history, and physics majors.

• The number of avalanche fatalities in Colorado for the last nine seasons was reported as 7, 1, 6, 6, 7, 5, 8, 2,
• What type of distribution do the numbers represent?
• unimodal
• bimodal
• multimodal
• nonmodal

• What is the primary limitation of the correlation coefficient?
• It is not appropriate if the variables are related in a linear fashion.
• It cannot be used to establish causal relations between two variables.
• It can be used to establish the direction of a relation between two variables but not the strength of 2 / 4

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that relation.

• It can only be used if the data are measured on a nominal or ordinal scale.

• A multiple regression analysis revealed the following equation relating the time (in hours) it takes to

complete a puzzle based on the number and size of pieces: = 1.5 + 0.014 (Xnumber of pieces) – 1.2 (Ysize of pieces).If a puzzle has 1000 pieces, with a size value of 0.5 inches, how long will it take to complete?

• 6.3 hours
• 7.9 hours
• 11.9 hours
• 14.9 hours

• In the six steps of hypothesis testing, when are the null and research hypothesis stated in relation to

calculating the test statistic?

• The hypothesis is stated before calculating the test statistic because it is the predicted outcome for the

question of interest and would not be informative or fairly conceived after the data are analyzed.

• The hypothesis is formulated at the end of the process, after the test statistic has been calculated and

a conclusion is reached.

• The hypothesis is the actual outcome of the study and cannot be verified unless it is formulated after

the test statistic is computed.

• The hypothesis is formulated after the data is collected but before the test statistic is calculated.

• Compared to a distribution of scores, the distribution of means has less spread because:
• extreme scores are averaged with less extreme scores or those in the opposite direction.
• sample size is smaller for means than for scores.
• standard error replaces standard deviation.
• central tendency pulls scores to the mean, resulting in less variability.

• In a two-way ANOVA, three _____ statistics are calculated.
• z
• F
• t
• R

2

• In Cohen's d, the closer together the means of two distributions, the _____ the effect size, assuming the

standard deviation is held constant.

• more variable
• less variable
• larger
• smaller

• Sumaya predicted that people with highly symmetric faces will be rated as more attractive than people with

less symmetric facial features. What should she do if her test statistic is in the critical region? 3 / 4

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• reject the null hypothesis
• reject the research hypothesis
• accept the null hypothesis
• increase the sample size

• A given distribution has a mean of 50 and a standard deviation of 5. When comparing a score of 55 to this

distribution of scores, the percentile rank is _____, whereas comparing a mean of 55, based on a sample of 10, to a distribution of means created from this parent population will result in a percentile rank of _____.

• 84.13; 84.13
• 84.13; 99.87
• 99.87; 84.13
• 51.00; 53.16

• A study reports finding a "significant" difference between group means. What can be concluded about this

report?

• The findings must be important and meaningful.
• The conclusion would be that we must also have information about the spread and overlap of the

distributions in order to fully assess the importance and impact of the results.

• The difference between group means, while unlikely to occur by chance, is so small that there is no

practical effect when the findings are generalized to the larger population.

• There is no way to tell the practical importance of these results.

• Overall, rats that received a drug took longer to find their way out of a maze than rats that received a

placebo, F (1, 57) = 7.23, p < 0.05; the drug had a large effect on albino rats and virtually no effect on wild-bred rats, F (1, 57) = 11.01, p < 0.05. However, there was no overall difference in the time of albino rats compared to that of wild-bred rats, F (1, 57) = 1.11, p > 0.10. Which effect(s) must be present for these results to be true?

• main effect of drug
• main effect of rat species
• interaction of drug and rat species
• main effect of drug and an interaction of drug and rat species

• For a distribution of scores, the standard deviation is 30. If we create a distribution of means, drawn from

that sample, based on a sample size of 10, what is the standard error?

• 0.33
• 3.00
• 5.48
• 9.49

• Although nonparametric tests such as chi-square can be used with populations that are not normally

distributed, there is still an important assumption that the data are:

• independently sampled from the population.
• scale variables.
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