Flag question: Question 1
Question 10.5 pts
When is the Pearson r correlation coefficient zero?
Group of answer choices
It is never zero
when there is no linear correlation
when there is a perfect positive correlation
when there is a perfect negative correlation
Flag question: Question 2
Question 20.5 pts
If the variance is 1, then the standard deviation is
Group of answer choices
1
.5
2
0
Flag question: Question 3
Question 30.5 pts
Which scenario best fits a simple regression?
Group of answer choices
A study comparing pretest and post-test scores on the same variable
Using hours studied to predict test scores
A longitudinal study with 3 time points
Flag question: Question 4
Question 40.5 pts
Which significance test should be used to see if ADHD predicts grades in school?
Group of answer choices
single sample t-test
independent samples t-test
One-way ANOVA
simple regression
Flag question: Question 5
Question 50.5 pts
Which significance test should be used to see if time studying predicts your grade on this exam?
Group of answer choices
single sample t-test
independent samples t-test
simple regression
Z-test
Flag question: Question 6
Question 60.5 pts
We are testing a new treatment for anxiety. One group gets the treatment and the other group gets no treatment (Control group). Which significance test should we use?
Group of answer choices
single sample t-test
dependent samples t-test
independent samples t-test
One-way ANOVA
Flag question: Question 7
Question 70.5 pts
Use this scenario for the following three questions.
A researcher created a short screening test for anxiety. A comparison was made with the gold standard for diagnosis of anxiety among 200 outpatients. Among the 50 outpatients found to be anxious according to the gold standard, 35 patients were positive for the test. Among 150 patients found not to be anxious according to the gold standard, 30 patients were found to be positive for the test.
Which is correct to the nearest decimal place:
Group of answer choices
The sensitivity was 80%
The specificity was 80%
The positive predictive value was 70%
The prevalence of anxiety was 25%
Flag question: Question 8
Question 80.5 pts
The following measures are identical whether the test is applied to general practice patients or to the psychiatric outpatients:
Group of answer choices
Prevalence of anxiety
Sensitivity
Specificity
Flag question: Question 9
Question 90.5 pts
What was the negative predictive value to the nearest decimal place?
Group of answer choices
88%
89%
88.9%
80%
Flag question: Question 10
Question 100.5 pts
Use the following scenario for the next four questions.
The table below shows the results from looking at the diagnostic accuracy of a new rapid test for HIV in 1,000 subjects, compared to the standard ELISA test. The rows of the table represent the test result and the columns the true disease status (as confirmed by ELISA).
