PSYC 354 Review Test Exam 4

PSYC 354 Review Test Exam 4

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Instructions

Time limit: 1 hour and 30 minutes

40 multiple­choice questions

Open­book/open­notes

Results Displayed Submitted Answers

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1                                 Imagine that the confidence interval around a group's mean is [980, 1160], what is the mean?

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2                                 A negatively skewed distribution would most likely violate which assumption?

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3                                 A researcher conducts a single­sample t test and finds statistical significance at the 0.01 level.

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4                                 The formula “                           ” is used to represent the:

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5                                 Cohen's d is one measure of:

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6                                 The single­sample t test compares a sample mean to a population mean when:

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do we use to compare a sample to the population?

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8                                 Why are effect sizes rather than test statistics used when comparing study results?

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9                                 What falls within the 95% confidence interval?

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10                                 We calculate a statistical power and find that it is 0.93. This means that if the null hypothesis is                , we have a                % chance of rejecting the null hypothesis.

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11                                 A confidence interval is a(n.                  that includes the population mean after repeatedly sampling.

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12                                 One of the roles of the researcher performing a meta­analysis is to:

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13                                 The statement “The findings based on a sample of 1000 participants were statistically significant, providing evidence for our hypothesis” would be strengthened by:

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14                                 We can increase statistical power with each of the following except:

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15                                 Imagine that a study of memory and aging finds that younger participants correctly recall 55% of studied words, older participants correctly recall 42% of studied words, and the size of this effect is Cohen's d = 0.49. This effect size indicates that the memory performance of:

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16                                 That a results is statistically significant does not mean that it is

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17                                 When we report that something is statistically significant, it means that

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18                                 Increasing sample size:

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19                                 Many companies that manufacture light bulbs advertise their 60­watt bulbs as having an average life of 1000 hours. A cynical consumer bought 30 bulbs and burned them until they failed. He found that they burned for an average of M = 1233, with a standard deviation of s =

232.06. What statistical test would this consumer use to determine whether the average burn time of light bulbs differs significantly from that advertised?

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20                                 The correct formula for effect size using Cohen's d for a single­sample t test is:

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21                                 In statistics, what does “homogeneous” mean?

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22                                 According to Cohen's convention, a value of                 is a small effect size.

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23                                 Meta­analysis involves:

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24                                 The practical use of statistical power is that it informs you the researcher:

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25                                 Alpha refers to:

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26                                 The larger the effect size, the:

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27                                 Candidate #2 received 32% of the votes and candidate #3 received 14% of the votes, with a margin of error of 6%. What does this information tell us about the popularity of these candidates?

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28                                 Statistical convention for the minimal acceptable power is:

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29                                 The numerator (top portion) of the ratio for calculating all the t statistics contains:

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30                                 Identify the formula for the single­sample t test.

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31                                 The second step in conducting the single­sample t test involves                 

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32                                 Which of the following reports of statistical results are in appropriate APA format?

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33                                 According to Cohen's convention, a value of                 is a large effect size.

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34                                 Effect size assesses the degree to which two:

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35                                 The formula for the degrees of freedom for the single­sample t test is:

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36                                 Using the following information, convert the z score to a raw score: z = ­2.3, mu = 15.5, sigma = 4.

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37                                 In a distribution of Z scores, the mean is always

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38                                 A population is normally distributed with μ = 30, σ =

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10, and our sample N = 25. What are the mean and standard error of the distribution of

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39                                 A population is normally distributed with μ = 50, σ =

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40                                 If the mean of a test is 13 and its standard deviation is 3, the Z score for a person with a raw score of 7 is