stats test (independent samples, t tests)

An experiment in which different subjects are assigned to each group is a __________

between subjects design

When we use __________, we randomly determine who serves in each group in an
experiment

random assignment

__________ is the extent to which the results of an experiment can be attributed to the manipulation of the independent variable, rather than to some confounding variable

internal validity

When neither the experimenter nor the subject know the condition to which each
subject has been assigned, a _________ experiment is being used

double blind

A(n) __________ is a parametric inferential test for comparing sample means of two independent group

independent samples t test

__________ is an inferential statistic for measuring effect size with t tests

cohen’s D

Manipulate is to measure as ____ is to ____

independent variable; dependent variable

In an experimental study of the effects of stress on appetite, stress is the

independent variable 

In an experimental study of the effects of stress on appetite, subjects are randomly
assigned to either the no‑stress group or the stress group. These groups represent the ____ and the ____, respectively.

control group; experimental group

The extent to which the results of an experiment can be attributed to the manipulation of the independent variable refers to

internal validity

The value of the t test will __________ as sample variance decreases.

increase

Which of the following t test results has the greatest chance of statistical significance?
a. t(28) = 3.12
b. t(14) = 3.12
c. t(18) = 3.12
d. t(10) = 3.12

a

If the null hypothesis is false, then the t test should be

greater than 1

Imagine that you conducted an independent groups t test with 10 participants in each
group. For a one-tailed test, the tcv at a = .05 would be:
a. ±1.729.
b. ±2.101.
c. ±1.734.
d. ±2.093

b

If a researcher reported for an independent groups t test that t(26) = 2.90, p <
.005,how many subjects were there in the study?
a. 13
b. 26
c. 27
d. 28

28

Cohen’s d is a measure of __________ for a ___________.

effect size; t test

tcv = ±2.15 and tobt = –2.20. Based on these results we

reject the null