Estimated Standard Error, Repeated-Measures T Test, Two-Tailed Test, Statistics Quiz
Sample Mean, Hypothesis, Repeated-Measures, Reject The Null Hypothesis, Estimated Standard Error, Repeated Measures T Test, Sample Variance, Statistics, Two-Tailed Test, Hypothesis Test, Sample Size, Research Design, T Statistic, Independent-Measures, Research Study, Square Root, Variance.
A researcher conducts a repeated-measures study to evaluate a treatment with a sample of n = 16 participants and obtains a t statistic of t = 1.94. The treatment is expected to increase scores and the sample mean shows an increase. Which of the following is the correct decision for a hypothesis test using α = .05.
Reject the null hypothesis with a one-tailed test but fail to reject with two tails
Which set of characteristics will produce the smallest value for the estimated standard error
A large sample size and a small sample variance
If the other factors are held constant, what is the effect of increasing the sample variance
It will increase the estimated standard error and decrease the likelihood of rejecting Ho
With Alpha =.05 and df= 8, the critical values for a two-tailed test are t=+-2.306. assuming all other factors are held constant, if the df value were increased to df= 20, what would happen to the critical values for t
They would decrease (move closer to zero)
Why t statistics variabale than Z scores
The extra variability is caused by variations in the sample variance
For which of the following situations would a repeated- measures research design be appropriate
Comparing pain tolerance with and without acupuncture needles
A repeated-measures study an independent-measures study both produced a t-statistics with df = 16. How many individuals participated each study
17 for repeated- measures and 18 for independent -measures
Which set of characteristics will produce the smallest value for the estimated standard error
A large sample size and a small sample variance
The result of a one sample t-test are reported as follows: t(15) = 2.70, p<.05. Based on this report, how many individuals were in the samples
16
What value is estimated with a confidence interval using the t-statistic (one sample t-test)
The value for an unknown population mean
A researcher reports t(22) =5.30, p<.01 for an independent-measures experiment. how many individuals participated in the entire experiment
24
If the null hypothesis is true, what value is expected on average for the repeated-measures t statistic?
0
One sample has n=5 scores and the second has n=10 scores. if the polled variance for the two sample is 30, then what is the value of the estimated standard error for the sample mean difference
The square root of (30/5 + 30/10)
A research report describing the results from a repeated-measures study states that the data show no significant difference between the two treatments, t(10) = 1.65, p > .05. Based on this report, how many individuals participated in the research study?
11
For which of the following situations would a repeated-measures research design be appropriate?
Comparing pain tolerance with and without acupuncture needles
An independent- measures research study uses two samples, each with n=12 participants. if the data produce a t statistics of tobj =2.50, then which of the following is the correct decision for a two-tailed hypothesis test
Reject the null hypothesis with alpha=.05 but fail to reject with a=.01
If the sample mean difference is 3 points, which of the following sets of data would produce the largest value for Cohen’s d
n=10 for both samples and a pooled variance of 15
n=20 for both samples and a pooled variance of 15
n=30 for both samples and a pooled variance of 15
Cohen’s d is the same for all three of the samples
Which combination of factors is most likely to produce a significant value for an independent-measures t-statistics
Small samples and large variance
For which of the following situations would a repeated- measures research design be appropriate
Comparing pain tolerance with and without acupuncture needles
A repeated-measures study an independent- measures study both produced a t-statistics with df = 16. How many individuals participated each study
17 for repeated-measures and 18 for independent -measures
If the null hypothesis is true, what value is expected on a average for the repeated – measures t- statistic
0
One sample has n=5 scores and the second has n=10 scores. if the polled variance for the two sample is 30, then what is the value of the estimated standard error for the sample mean difference
The square root of (30/5 + 30/10)
A researcher uses a repeated – measures design to compare individuals’ performance before treatment with their performance after treatment. if all of the participants show improved performance of 8 or 9 points after treatment, then the researcher should find
The variance of the difference scores is near zero
Which set of characteristics will produce the smallest value for the estimated standard error
A large sample size and a small sample variance
The result of a one sample t -test are reported as follows: t(15) = 2.70, p<.05. Based on this report, how many individuals were in the samples
16
A researcher reports t(22) =5.30, p<.01 for an independent-measures experiment. how many individuals participated in the entire experiment
24
One sample has n=5 scores and the second has n=10 scores. if the polled variance for the two sample is 30, then what is the value of the estimated standard error for the sample mean difference
The square root of (30/5 + 30/10)
For which of the following situations would a repeated-measures research design be appropriate?
Comparing pain tolerance with and without acupuncture needles
An independent-measures research study uses two samples, each with n=12 participants. if the data produce a t statistics of tobj =2.50, then which of the following is the correct decision for a two-tailed hypothesis test
Reject the null hypothesis with alpha=.05 but fail to reject with a=.01
If the sample mean difference is 3 points, which of the following sets of data would produce the largest value for Cohen’s d
n=10 for both samples and a pooled variance of 15
n=20 for both samples and a pooled variance of 15
n=30 for both samples and a pooled variance of 15
Cohen’s d is the same for all three of the samples
Which combination of factors is most likely to produce a significant value for an independent-measures t-statistics
Small samples and large variance
For which of the following situations would a repeated-measures research design be appropriate
Comparing pain tolerance with and without acupuncture needles
A repeated-measures study an independent-measures study both produced a t-statistics with df = 16. How many individuals participated each study
17 for repeated-measures and 18 for independent-measures
Which set of characteristics will produce the smallest value for the estimated standard error
A large sample size and a small sample variance
One sample has n=5 scores and the second has n=10 scores. if the polled variance for the two sample is 30, then what is the value of the estimated standard error for the sample mean difference