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
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