HW 6: z-test, t-test for independent samples, t-test for related
samples, 1-way ANOVA
Researchers wanted to...
HW 6: z-test, t-test for independent samples, t-test for related
samples, 1-way ANOVA
Researchers wanted to explore different treatment methods to
effect memory skills in high school freshmen. Subjects were given a
memory test (under multiple conditions) these were the results:
Group 1
10, 8, 9, 11,
8, 9, 7, 6,
9, 8
Group 2
12, 10,
11, 9, 13, 8, 9, 12, 11, 11
Group 3
10, 9, 10, 9, 11,
8, 7, 9, 10, 11...
For questions 1 through 3 state the proper t-test (one
sample, paired samples, independent samples) that...
For questions 1 through 3 state the proper t-test (one
sample, paired samples, independent samples) that should be used to
evaluate the research question: (*Just state the test)
1) A developmental psychologist wants to determine if
a recently created computer training program can increase the
working memory ability of high-school students. A sample of 40
students are given the reverse digit span test at the beginning of
the school year and then again after 4 weeks of training. Are there...
1. A researcher is comparing scores from two treatment groups
using independent samples t test. Use...
1. A researcher is comparing scores from two treatment groups
using independent samples t test. Use a Hartley’s
F-max test to examine this assumption (each group has 6
participants, s2 in group 1 is 20, and s2 in
group 2 is 15, set alpha level at .05). Also, how should this
researcher estimate the standard error in the independent samples
t test?
What is the appropriate statistical analysis to use: t-test for
two independent samples, t-test for dependent...
What is the appropriate statistical analysis to use: t-test for
two independent samples, t-test for dependent samples, ANOVA, or
chi-square test of independence? Please identify and explain why it
is appropriate. (a) A study was conducted to see whether monetary
incentives to use less water during times of drought had an effect
on water usage. Sixty single-family homeowners were randomly
assigned to one of two groups: 1) monetary incentives and 2) no
monetary incentives. At the end of three months,...
An independent-samples t test is performed on the
samples below:
Sample 1: M = 24.1, s2...
An independent-samples t test is performed on the
samples below:
Sample 1: M = 24.1, s2 = 32.02,
n = 10
Sample 2: M = 19.4, s2 = 44.46,
n = 10
a.)Calculate the standard error for the t test
(sM1-M2). (Round to 4 decimal
places.)
b.)Calculate the degrees of freedom for the t test.
c.)Find the critical value of t with two tails and
alpha = 0.05. (Keep 3 decimal places.)
d.)Calculate the t test. (Round answer to two decimal
places.)
: Identify IV, DV, and hypotheses and evaluate
the null hypothesis for an independent samples t...
: Identify IV, DV, and hypotheses and evaluate
the null hypothesis for an independent samples t test.
Data: Use the information from Problem Set
3.7.
Instructions: Complete the following:
Minutes of practice:
Group 1: 34, 25, 4, 64, 14, 49, 54
Group 2: 24, 78, 59, 68, 84, 79,
57
a. Identify the IV and DV
in the study.
b. State the null
hypothesis and the directional (one-tailed) alternative
hypothesis.
c. Can you reject the null
hypothesis at α =...