What is a t test, when is it used, and what does it tell us?
What will be an ideal response?
A t test is a parametric inferential statistical test of the null hypothesis for a single sample where the population variance is not known. It is used for samples of 30 or less, when the distribution is bell-shaped but not normal, and the data are interval or ratio. It tells us whether a sample mean differs significantly from a population mean.
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Which of the following is MOST likely to be studied by a cognitive psychologist?
a. strategies used by college students to solve a particular problem b. play behavior in preschool children c. whether or not a job incentive program is effective d. factors that determine group cohesiveness
In positive practice overcorrection, what must the learner do following the problem behavior?
a. correct the environment damaged by the behavior b. comply with the task that was requested prior to the problem behavior c. repeatedly engage in the correct behavior d. engage in an effortful behavior that is not related to the problem behavior.
Which of the following conditions affects the long-term quality of a marriage?
not living together before marriage the childhood experiences of only the wife the partners' personalities the childhood experiences of only the husband
The degrees of freedom determine the ______ the t distribution.
A. mean of B. variance of C. shape of D. range of