A principal at a local school wants to know how much students gain from being in
ID: 3055104 • Letter: A
Question
A principal at a local school wants to know how much students gain from being in an honors class. He gives students in an honors English class a test prior to the school year and again at the end of the school year to measure how much students learned during the year. What type of design is this?
repeated measures
matched-pairs
What effect would reducing the level of significance from .05 to .01 have on the value of the test statistic for a related samples t-test?
the test statistic would increase
the test statistic would decrease
it would have no effect
A researcher matches right-handed and left-handed siblings to test whether right-handed siblings express greater emotional intelligence than left-handed siblings. Which type of test is most appropriate?
one-independent sample t-test
related samples t-test
two-independent samples t-test
A graduate student selects a sample of 25 participants to test whether the average time students attend to some task is greater than 30 minutes. Which type of test is most appropriate?
one-independent sample t-test
related samples t-test
two-independent samples t-test
What effect would doubling the size of the estimated standard error for the mean difference have on the value of the test statistic for a related samples t-test?
the test statistic would decrease
the test statistic would increase
it would have no effect
What effect would decreasing the mean difference have on the value of the test statistic for a related samples t-test?
it would have no effect
the test statistic would increase
the test statistic would decrease
Explanation / Answer
1. The matched-pair t-test (or paired t-test or paired samples t-test or dependent t-test) is used when the data from the two groups can be presented in pairs, for example where the same people are being measured in before-and-after comparison or when the group is given two different tests at different times.
Hence answer is matched pairs
2. Level of significance will affect critical value but not the test statistics.
So answer is it would have no effect
3. Here they are two independent samples
So answer is two-independent samples t-test
4. Here test is done on a single sample.
So answer is one-independent sample t-test
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