What can be said about the relationship between the significance and the effect size of a hypothesis test?
Group of answer choices
a.) The significance of a test is not determined by the effect size.
b.) The effect size is always the same as the test statistic, which determines the significance of a test result.
c.) A significant test result leads to a large effect size while a non-significant test result leads to a small effect size.
d.) The effect size is determined by the alpha level while the significance of a test is not.
When conducting an independent samples t test, a typical alternative hypothesis might be ________.
Group of answer choices
a.) The mean of the population of change scores is significantly different from 0.
b.) The mean of the population of interest is significantly different from the mean of the general population.
c.) The mean of sample 1 is different from the mean of the general population.
d.) The mean of population 1 is significantly different from the mean of population 2.
When you conduct a t test for independent means, ____.
Group of answer choices
a.) You should only use an alpha level of .01 because of the lower power of this test compared to dependent-means t test.
b.) You reject the null hypothesis if the t score is more extreme than the cutoff (criterion) t score.
c.) You need to make sure that the medians of the two populations are equal.
d.) You need to make sure that the two sample sizes are exactly the same.
Which statement best describes the DSM in an independent samples t test?
Group of answer choices
a.) The comparison distribution has a standard deviation that is the average of the standard deviations of the two populations being compared.
b.) The comparison distribution consists of all possible samples mean drawn from the original population.
c.) The pooled variance represents the variance of the comparison distribution.
d.) The comparison distribution has a mean of 0.
A market researcher would like to know if there is a relationship between the decision to take a cruise trip and the traveler's income level. She conducts a survey by recruiting people who regularly travel outside of the contiguous US to find out whether they have taken a cruise trip and their annual income. She then compares the average income of the people who have taken cruise trips and the average income of the people who have not taken cruise trips with a statistical test. What would be the appropriate test for this study?
Group of answer choices
a.) Independent-samples t test
b.) Repeated measures t test
c.) Bivariate (Pearson's) correlation
d.) Chi-square test for independence
Calculate Cohen's d effect size for an independent-samples t test, based on the following information:
Group 1 has 10 subjects and the sample mean is 23.
Group 2 has 10 subjects and the sample mean is 11.
The pooled variance for the populations is 25.
Group of answer choices
a.) .08
b.) .58
c.) 1.27
d.) 2.4