Researchers want to test the effectiveness of a new pain medication. Four hundred people were recruited to participate in the clinical trial. In clinical testing, 40 out of 201 people taking the medication reported pain symptoms. Of the other 199 people receiving a placebo, 20 reported pain symptoms. Combining the two samples together, what is the overall proportion of those who reported pain symptoms among all participants?

0.34

0.47

0.15

0.19

In simple linear regression, the dependent variable is:

the variable we wish to explain

the variable used to explain the outcome

none of the above.

the variable which is uncorrelated with the independent variable X

Which of the following indicates a strong positive correlation?

-.81

0

.45

.93

A biostatistician finds the relationship between the number of weeks (X) spent in a hospital and number of seizures per week (Y) andis described by the following equation:.This is based on a sample size of 50 patients and the associated coefficient of correlation is r = .93.

Using this information above, answer the following question: How do you interpret r = -.93?

There is a strong negative relationship between the number of weeks spent in a hospital and the number of seizures recorded.

There is a perfect positive relationship between the number of weeks spent in a hospital and the number of seizures recorded.

There is a perfect negative relationship between the number of weeks spent in a hospital and the number of seizures recorded.

There is a strong positive relationship between the number of weeks spent in a hospital and the number of seizures recorded.