PSY 200 TEST 3.
Perfect Prep for Every Paper | Precision in Every Answer!
The formula for the degrees of freedom for the dependent-samples t test is: - Answer:
N-1
When conducting a paired-samples t test, the sample mean difference is compared to:: -
Answer: a distribution of mean differences.
A researcher is worried that performance on an aptitude test will improve simply
because of repeat exposure to the instrument, which will cloud his ability to assess the
impact of two unique educational interventions he wants to study (Program A and
Program B). Which of these design options includes counterbalancing? - Answer: He
could vary the order of the educational interventions such that half of the participants
experience Program A first and the other half experience Program B first.
According to the null hypothesis, the mean difference for the comparison distribution in
a paired-samples t test is: - Answer: always 0
The denominator (bottom portion) of the ratio for calculating the dependent-samples t
statistic is the: - Answer: estimated standard error of the distribution of mean difference
scores.
The American Psychological Association encourages researchers to report _____ for
paired-samples t tests. - Answer: both effect sizes and confidence intervals
In a paired-samples t test, the null hypothesis posits that the mean of the comparison
distribution is: - Answer: 0
A researcher investigates whether chocolate affects mood. She recruits college students
to take a mood inventory, ingest a quarter pound of chocolate, and then complete the
mood inventory again. Given the confidence interval [2.34, 5.41], what decision about
1
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, the hypothesis should be made? - Answer: Reject the null hypothesis and conclude that
chocolate affected mood because 0, or no effect, does not fall within the confidence
interval.
The formula for the null hypothesis for a paired-samples t test is: - Answer: H0: μ1 = μ2.
What would be the decision for a two-tailed paired-samples t test where the confidence
interval was determined to be [1.34, 6.45]? - Answer: reject the null hypothesis
A paired-samples t test is reported as t(15) = 0.918, p > 0.05, d = 0.17. What is the
effect size for this statistical test? - Answer: This is a small effect.
When conducting a paired-samples t test, the sample mean difference is compared to: -
Answer: a distribution of mean differences.
What would be the decision for a two-tailed paired-samples t test where the confidence
interval was determined to be [-3.45, -0.61]? - Answer: reject the null hypothesis
Single Sample t test - Answer: is similar to the z test where we are comparing a single
sample to the known population
-not using standard error because the population SD/variance is not known
Paired Sample T - Answer: two sample means are compared for a within-groups design
Assumptions - Answer: -scaled dependent variable
-random selection
-normal distribution
Counterbalancing - Answer: minimizes order effect by varying the order of presentation
of different levels of the independent variable from one participant to the next
-can reduce order effects in within-groups research designs
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
Perfect Prep for Every Paper | Precision in Every Answer!
The formula for the degrees of freedom for the dependent-samples t test is: - Answer:
N-1
When conducting a paired-samples t test, the sample mean difference is compared to:: -
Answer: a distribution of mean differences.
A researcher is worried that performance on an aptitude test will improve simply
because of repeat exposure to the instrument, which will cloud his ability to assess the
impact of two unique educational interventions he wants to study (Program A and
Program B). Which of these design options includes counterbalancing? - Answer: He
could vary the order of the educational interventions such that half of the participants
experience Program A first and the other half experience Program B first.
According to the null hypothesis, the mean difference for the comparison distribution in
a paired-samples t test is: - Answer: always 0
The denominator (bottom portion) of the ratio for calculating the dependent-samples t
statistic is the: - Answer: estimated standard error of the distribution of mean difference
scores.
The American Psychological Association encourages researchers to report _____ for
paired-samples t tests. - Answer: both effect sizes and confidence intervals
In a paired-samples t test, the null hypothesis posits that the mean of the comparison
distribution is: - Answer: 0
A researcher investigates whether chocolate affects mood. She recruits college students
to take a mood inventory, ingest a quarter pound of chocolate, and then complete the
mood inventory again. Given the confidence interval [2.34, 5.41], what decision about
1
APPHIA - Crafted with Care and Precision for Academic Excellence.
, the hypothesis should be made? - Answer: Reject the null hypothesis and conclude that
chocolate affected mood because 0, or no effect, does not fall within the confidence
interval.
The formula for the null hypothesis for a paired-samples t test is: - Answer: H0: μ1 = μ2.
What would be the decision for a two-tailed paired-samples t test where the confidence
interval was determined to be [1.34, 6.45]? - Answer: reject the null hypothesis
A paired-samples t test is reported as t(15) = 0.918, p > 0.05, d = 0.17. What is the
effect size for this statistical test? - Answer: This is a small effect.
When conducting a paired-samples t test, the sample mean difference is compared to: -
Answer: a distribution of mean differences.
What would be the decision for a two-tailed paired-samples t test where the confidence
interval was determined to be [-3.45, -0.61]? - Answer: reject the null hypothesis
Single Sample t test - Answer: is similar to the z test where we are comparing a single
sample to the known population
-not using standard error because the population SD/variance is not known
Paired Sample T - Answer: two sample means are compared for a within-groups design
Assumptions - Answer: -scaled dependent variable
-random selection
-normal distribution
Counterbalancing - Answer: minimizes order effect by varying the order of presentation
of different levels of the independent variable from one participant to the next
-can reduce order effects in within-groups research designs
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
