samples t test has three assumptions, including all but:There are fewer than 30 sample data.9.
We have learned three t tests, including all of the following exceptExperimental10. The
single-sample t test compares a sample mean to a population mean when:The population
standard deviation is unknown12. According to the null hypothesis, the mean difference for
the comparison distribution in apaired-samples t test is:Always 0
14. A researcher conducts a single-sample t test and finds statistical significance at the 0.01
level.The effect size is then calculated and found to be 0.04. What might you conclude about
thefindings?While the results of the test are statistically significant, the effect size indicates
that theymay not be practically significant. It might be the case that a very large sample was
studied,driving up the test statistic value.16. In an ______, one sample is compared to a
population for which we only know the meanduring hypothesis testing.
test22. The critical cutoffs for a two-tailed, paired-samples t test with seven participants at a p
levelof 0.01 are:-3.708 and 3.70824. Researchers were interested in whether relaxation
training decreases the number ofheadaches a person experiences. They randomly assigned 20
participants to a control group or arelaxation training group and noted the change in number
of headaches each group reported fromthe week before training to the week after training.
If the standard deviation for a population, as estimated from a sample, is s =
5.6, then the standard error for a sample size of N = 16 is:
Why do we divide by N - 1 rather than by N when estimating a
population standard deviation from the sample standard deviation?
11. What mean is the confidence interval centered around in a single-sample
12. With very few degrees of freedom, the test statistic:
In a paired-samples t test, the null hypothesis posits that the mean
of the comparison distribution is: