BESC 3010 FINAL PREPARATION
TEST QUESTIONS WITH COMPLETE
A+ SOLUTIONS
When conducting a z-test, which probability distribution would be appropriate to use? -
Answer-z-distribution
Which effect size is most appropriate for z-tests? - Answer-Cohen's d
Which z-score is closest to the mean? - Answer-.02
In a normal distribution, it is very unusual to find scores outside of what range of z-
scores? - Answer--3 and 3
If a raw score distribution has a mean of 12 and a standard deviation of 3, what number
would have a z-score of -2? - Answer-6
A researcher uses alpha as the criteria or critical value for the maximum probability of
incorrectly rejecting the null hypothesis. She conducts a z-test with alpha = .05 and finds
the p-value is .02. The researcher should: - Answer-Reject the null hypothesis
Which of the following is MOST sensitive to extreme scores? - Answer-Range
Most data sets in social science studies are from ________. - Answer-Samples
A sampling distribution of means is: - Answer-A distribution of means from many
samples
The sample mean is a(n) ________ of the population mean. - Answer-Unbiased point
estimate
According to the Central Limit Theorem, it is safe to assume that given an infinite
number of samples: - Answer-The shape of the distribution of sample means will
approximate a normal curve if the sample size (n) used to calculate each mean > 30.
In hypothesis testing, if the null hypothesis has been rejected, what hypothesis do we
assume? - Answer-The alternative hypothesis
In null hypothesis testing, if the critical value is less extreme than the observed value
(i.e., test value), then: - Answer-The null hypothesis is retained (i.e., not rejected)
, Which of the following is always true for "statistically significant" results? - Answer-None
of the above
Which of the following statements below is inappropriate when discussing results of
statistical significance tests? - Answer-The null hypothesis has been proven true
What would be the advantage of increasing N in null hypothesis significance testing? -
Answer-The null hypothesis would be more likely to be rejected
p-values are: - Answer-Influenced by sample size
Which of the following is an impossible value for both p and alpha? - Answer-.00
If we use alpha as the criteria or critical value for the maximum probability of incorrectly
rejecting the null hypothesis, then when the p-value is less than alpha: - Answer-The
null hypothesis is rejected
A researcher conducts two studies on relational satisfaction with the same independent
and dependent variables. After conducting a two-sample t-test, Study A was found to
have an effect size of .65 and a p-value of .0001. Study B was found to have an effect
size of .65 and a p-value of .076. Which study has the smaller sample size? - Answer-
Study B
A researcher conducts two studies on depression severity with the same independent
and dependent variables. Study A had a sample size of 500 and the p-value was
calculated at .002. Study B also had a sample size of 500 and the p-value was
calculated at .033. Which study had the smaller effect size? - Answer-Study B
The effect size is calculated as d = .89. What does this mean? - Answer-The sample
mean is .89 standard deviations away from the population mean
If Cohen's d = 2.25, then which of the following is always true? - Answer-There are 2.25
standard deviations between the two sample means
If Cohen's d is very small, the two means are ______ each other - Answer-close to
Committing a Type II error is defined as: - Answer-Not rejecting (i.e., Retaining) the null
hypothesis when it should have been rejected
After a researcher rejects the null hypothesis, she needs to be aware of - Answer-Type I
error
A two-sample t-test is conducted: - Answer-When two sample means are being
compared
TEST QUESTIONS WITH COMPLETE
A+ SOLUTIONS
When conducting a z-test, which probability distribution would be appropriate to use? -
Answer-z-distribution
Which effect size is most appropriate for z-tests? - Answer-Cohen's d
Which z-score is closest to the mean? - Answer-.02
In a normal distribution, it is very unusual to find scores outside of what range of z-
scores? - Answer--3 and 3
If a raw score distribution has a mean of 12 and a standard deviation of 3, what number
would have a z-score of -2? - Answer-6
A researcher uses alpha as the criteria or critical value for the maximum probability of
incorrectly rejecting the null hypothesis. She conducts a z-test with alpha = .05 and finds
the p-value is .02. The researcher should: - Answer-Reject the null hypothesis
Which of the following is MOST sensitive to extreme scores? - Answer-Range
Most data sets in social science studies are from ________. - Answer-Samples
A sampling distribution of means is: - Answer-A distribution of means from many
samples
The sample mean is a(n) ________ of the population mean. - Answer-Unbiased point
estimate
According to the Central Limit Theorem, it is safe to assume that given an infinite
number of samples: - Answer-The shape of the distribution of sample means will
approximate a normal curve if the sample size (n) used to calculate each mean > 30.
In hypothesis testing, if the null hypothesis has been rejected, what hypothesis do we
assume? - Answer-The alternative hypothesis
In null hypothesis testing, if the critical value is less extreme than the observed value
(i.e., test value), then: - Answer-The null hypothesis is retained (i.e., not rejected)
, Which of the following is always true for "statistically significant" results? - Answer-None
of the above
Which of the following statements below is inappropriate when discussing results of
statistical significance tests? - Answer-The null hypothesis has been proven true
What would be the advantage of increasing N in null hypothesis significance testing? -
Answer-The null hypothesis would be more likely to be rejected
p-values are: - Answer-Influenced by sample size
Which of the following is an impossible value for both p and alpha? - Answer-.00
If we use alpha as the criteria or critical value for the maximum probability of incorrectly
rejecting the null hypothesis, then when the p-value is less than alpha: - Answer-The
null hypothesis is rejected
A researcher conducts two studies on relational satisfaction with the same independent
and dependent variables. After conducting a two-sample t-test, Study A was found to
have an effect size of .65 and a p-value of .0001. Study B was found to have an effect
size of .65 and a p-value of .076. Which study has the smaller sample size? - Answer-
Study B
A researcher conducts two studies on depression severity with the same independent
and dependent variables. Study A had a sample size of 500 and the p-value was
calculated at .002. Study B also had a sample size of 500 and the p-value was
calculated at .033. Which study had the smaller effect size? - Answer-Study B
The effect size is calculated as d = .89. What does this mean? - Answer-The sample
mean is .89 standard deviations away from the population mean
If Cohen's d = 2.25, then which of the following is always true? - Answer-There are 2.25
standard deviations between the two sample means
If Cohen's d is very small, the two means are ______ each other - Answer-close to
Committing a Type II error is defined as: - Answer-Not rejecting (i.e., Retaining) the null
hypothesis when it should have been rejected
After a researcher rejects the null hypothesis, she needs to be aware of - Answer-Type I
error
A two-sample t-test is conducted: - Answer-When two sample means are being
compared
