A researcher is studying the effects of aspirin on heart rate. He believes that aspirin will lower heart rate. He has 2 groups the treatment group receives 80mg of aspirin for a week () the control group received a placebo () and their heart rates are compared. Below is his data in which heart rate is measured in beats per minute. He sets his alpha level at .05 and uses a directional test. Placebo             Aspirin                        58                        52                        54                        60 Use the above data to calculate the observed t-score. **Report your answer to 4 decimal places.

The mean of a sampling distribution of the difference between two independent means is always equal to the:

For the previous problem about aspirin and heart rate, what is the correct conclusion? the null hypothesis, the heart rate for the placebo group the heart rate for the group given aspirin.

If a mean difference is 6, the estimated standard error of a mean difference is .50 and the nondirectional critical value of t for an alpha level of .05 is 2, what is the 95% confidence interval for the mean difference

Confidence intervals are used to ________.

The calculation of eta-squared _____ when the statistical test is nonsignificant.

An independent groups t-test can be performed when the dependent variable is ______.

Which of the following is represented by word descriptions, such as red and tall?

Little pieces of DNA on the lagging strand are referred to as

________ is an enzyme that builds RNA primer.