Answers:
the null hypothesis should be rejected.

their data are insufficient to assess the validity of the null hypothesis.
they failed to find a significant difference between the sample and population
means.
the research hypothesis is supported.
Question 15
5 out of 5 points
The t distribution allows researchers to generalize from

Question 16
5 out of 5 points
The symbol s is a _____ letter that describes a _____ statistic.

Question 17
5 out of 5 points
What would be the decision for the following paired-samples t test: t(24) = 4.11, p <
0.05?

Question 18
0 out of 5 points
What is the correct formula for calculating the standard deviation of a sample when
one is NOT trying to estimate the population standard deviation?
Selected Answer:
Answers:

Question 19
5 out of 5 points
If the standard deviation for a population, as estimated from a sample, is s = 10.23,
then the standard error for a sample size of N = 20 is sM =
Question 20

5 out of 5 points
What would be the decision for a two-tailed paired-samples t test where the t
statistic is 2.67, with cutoffs of ±2.776?

Question 1
5 out of 5 points
Imagine the average time to complete a 4-year bachelor degree is actually 4.7 years
based on national data. You collect data on the 68 psychology students who started
school during the same semester as you, finding an average time to complete at 4.3
years with a standard deviation of 0.6 years. What is your 95% confidence interval?

Question 2
5 out of 5 points
According to the null hypothesis, the mean difference for the comparison
distribution in a paired-samples t test is:

Selected Answer:
almost always zero.
Answers:
almost always zero.
sometimes zero.
almost always 1.
sometimes 1.

Question 3
0 out of 5 points
For the following data, what is the mean of the difference scores?
Before
After
110
103
98
104
89
97
114
127
Answers:

1.17
Question 4
5 out of 5 points
The second step in conducting the single-sample t test involves _____ and _____.

Question 5
5 out of 5 points
When performing a single-sample t test, an effect size of 0.80 would be interpreted
as a _____ effect.