Liberty University PSYC 354 Exam 4
· Question 1
2.5 out of 2.5 points
According to the textbook, a(n) ________ has more statistical

... [Show More] power; however, a ________ is more conservative.
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· Question 2
2.5 out of 2.5 points
Increasing sample size:
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· Question 3
2.5 out of 2.5 points
If the sample mean is 56.2, with an upper limit to the confidence interval of 59.94, what is the lower limit?
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· Question 4
2.5 out of 2.5 points
Which of the following reports of statistical results are in appropriate APA format?
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tp
· Question 5
2.5 out of 2.5 points
A confidence interval is a(n) _____ that includes the population mean a certain percentage of time with repeated sampling.
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· Question 6
0 out of 2.5 points
As sample size increases, the:
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· Question 7
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If the standard deviation for a population, as estimated from a sample, is s
= 10.23, then the standard error for a sample size of N = 20 is:
Selected Answer:
sM
· Question 8
2.5 out of 2.5 points
The practical use of statistical power is that it informs you the researcher:
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· Question 9
2.5 out of 2.5 points
The numerator (top portion) of the ratio for calculating all the t
statistics contains:
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· Question 10
2.5 out of 2.5 points
Michelle is a cognitive psychologist studying reading times for stories that contain either consistent or inconsistent information. She runs 38 people through her study and concludes that reading times slow when coherence breaks occur in a story. Specifically, she concludes reading times slow by 6.9 milliseconds on average. Michelle’s prediction is a(n):
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· Question 11
2.5 out of 2.5 points
The larger the effect size, the:
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· Question 12
2.5 out of 2.5 points
Increasing sample size:
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· Question 13
2.5 out of 2.5 points
According to Cohen’s convention, a value of ________ is a large effect size.
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· Question 14
2.5 out of 2.5 points
The formula for the degrees of freedom for the single-sample t test is:
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· Question 15
2.5 out of 2.5 points
A researcher collects 15 data points that yield a mean of 9.164 and a standard deviation (based on N – 1) of 2.377. If the researcher is comparing the sample to a population mean of 10.6, what is the value of the test statistic?
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· Question 16
2.5 out of 2.5 points
To remove the adjustment for the influence of sample size, Cohen’s d
uses the ________ rather than the ________ as part of its formula.
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· Question 17
2.5 out of 2.5 points
What falls within the 95% confidence interval?
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· Question 18
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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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· Question 19
0 out of 2.5 points
The single-sample t test compares a sample mean to a population mean when:
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· Question 20
2.5 out of 2.5 points
Statistical convention for the minimal acceptable power is:
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· Question 21
2.5 out of 2.5 points
When performing a single-sample t test, an effect size of 0.80 would be interpreted as a:
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· Question 22
2.5 out of 2.5 points
Identify the formula for the single-sample t test.
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· Question 23
0 out of 2.5 points
According to Cohen’s convention, a value of _____ is a medium effect size.
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· Question 24
2.5 out of 2.5 points
When we report that something is statistically significant, it means that
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· Question 25
2.5 out of 2.5 points
If the standard deviation for a population, as estimated from a sample, is s
= 5.6, then the standard error for a sample size of N = 16 is sM
= _____.
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· Question 26
2.5 out of 2.5 points
If the mean difference between levels of the independent variable are exaggerated, statistical power:
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· Question 27
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Statistical power is a measure of the ability to reject the null hypothesis when:
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· Question 28
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A negatively skewed distribution would most likely violate which assumption?
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· Question 29
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If a confidence interval of [212, 296] is centered around a mean of 254, what is the margin of error?
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· Question 30
2.5 out of 2.5 points
The formula “H0: µ1 = µ2” is used to represent the:
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· Question 31
2.5 out of 2.5 points
When performing a single-sample t test, an effect size of 0.50 would be interpreted as a _____ effect.
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· Question 32
2.5 out of 2.5 points
A behavioral neuroscientist is testing the effects of adrenaline on memory using a group of 12 rats. The researcher is unsure about how much adrenaline might produce an effect on memory. One group of rats will be injected with placebo saline (0 micrograms of adrenaline). The other group will be injected with a dose of adrenaline. When deciding between a 2-microgram dose or an 8-microgram dose (both of which are safe), the researcher opts to use the 8-microgram dose. The researcher has:
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· Question 33
2.5 out of 2.5 points
When performing a single-sample t test, an effect size of 0.20 would be interpreted as a _____ effect.
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· Question 34
2.5 out of 2.5 points
In statistics, what does “homogeneous” mean?
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· Question 35
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A meta-analysis is:
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· Question 36
2.5 out of 2.5 points
Using the percentage approximations for the normal curve, the percentage of scores between the mean and one standard deviation below the mean is ______
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· Question 37
2.5 out of 2.5 points
If the cutoff z score on the comparison distribution is ±2.31, a psychologist can reject the null hypothesis if the sample z score on this distribution is
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· Question 38
2.5 out of 2.5 points
A psychologist is most likely to calculate z scores in order to ______
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· Question 39
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In a distribution of z scores, the mean is always ______
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· Question 40
0 out of 2.5 points
A population is normally distributed with μ = 30, σ = 10, and our sample N = 25. What are the mean and standard error of the distribution of means, respectively?
Selected Answer:
MM
Sunday, April 15, 2018 9:10:19 PM EDT [Show Less]