Conducting a paired-samples t test
When conducting a paired-samples t test, we compare our sample mean difference to:
Select one:
a. sample means.
b. differences between means.
c. the t distribution.
d. a distribution of mean differences.
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We draw a ball from a bag that contains four red balls and eleven white balls. We replace the ball and draw another ball. What is the probability that both balls are white balls?
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:
When conducting a paired-samples t test, we can assess the practical importance of our obtained results by calculating:
For the single-sample t test, the confidence interval is centered around the:
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:
A researcher studies 45 volunteer citizens from a small community and asks them about the amount of caffeine (in milligrams) they ingest before and after lunch each day, a phenomenon that imagine we know is normally distributed.
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