A researcher is interested comparing quality of sleep between people who work ov

Question

A researcher is interested comparing quality of sleep between people who work overnight shifts and people who work day shifts. A sample of 50 day shift workers and 50 night shift workers are asked to complete a quality of sleep measure, which the researcher will treat as an interval scale measure. The researcher will compare the mean levels of each group to see if there is a statistically significant difference between the groups. Which analysis would be acceptable to use? one-sample t-test Independent samples t-test Pearson's r Paired-samples t-test

Explanation / Answer

ANSWER : independent-samples t-test

ANSWER B

The independent-samples t-test (or independent t-test, for short) compares the means between two unrelated groups on the same continuous, dependent variable.

Assumptions:

Assumption #1: Your dependent variable should be measured on a continuous scale (i.e., it is measured at the interval or ratio level).

Assumption #2: Your independent variable should consist of two categorical, independent groups

Assumption #3: You should have independence of observations, which means that there is no relationship between the observations in each group or between the groups themselves

Assumption #4: There should be no significant outliers.

Assumption #5: Your dependent variable should be approximately normally distributed for each group of the independent variable.

Assumption #6: There needs to be homogeneity of variances

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