Practice Quiz-Lecture 6

Question 1

Continuous variables can be summarized using

Answer 1

mean and standard deviation

Question 2

P-value is

Answer 2

Probability of getting the observed absolute test statistic or something more extreme under the null hypothesis

Question 3

A bivariate association examines

Answer 3

The relationship between two variables

Question 4

A critical value corresponding to type I error alpha is

Answer 4

The percentile of a (standard normal or t) distribution such that the area under the distribution outside the critical value is equal to alpha

Question 5

In the quinoa example given in slides 7 and 8 of your video, each individual provides 2 measurements

Answer 5

True

Question 6

To compare blood pressure in the morning versus evening, I would use a paired t test

Answer 6

True

Question 7

Given sample size n, the distribution and degrees of freedom of a paired t test statistic are

Answer 7

t distribution, n-1 degrees of freedom

Question 8

In the computer output for the Quinoa example in slide 14, the value of the test statistic is

Answer 8

3.596

Question 9

In the computer output for the Quinoa example in slide 14, the p-value is

Answer 9

0.001

Question 10

Based on the p-value in slide 14, you will reject the null hypothesis at type I error of alpha

Answer 10

True

Question 11

For the problem corresponding to the computer output given in slide 14, diet is a

Answer 11

categorical variable

Question 12

For the probem corresponding to the computer output given in slide 30, blood sugar level is a

Answer 12

continuous variable

Question 13

When performing a two group (or independent group) t test, the distribution of the test statistic has a

Answer 13

t distribution

Question 14

For the example given in slide 31, the value of the test statistic is

Answer 14

3.519

Question 15

For the example, when comparing the average blood sugar level in quinoa versus salmon diet group, the p-value is

Answer 15

0.001

Question 16

Suppose you conduct the hypothesis test using type I error of alpha = 0.05 and your p-value is 0.001. Then, you will reject the null hypothesis

Answer 16

True

Question 17

A medical assistant sampled the blood pressures of 20 randomly selected patients with high blood pressure before and after they receive a dose of a new medicine. Which hypothesis test should she use?

Answer 17

paired t test

Question 18

Suppose you perform paired t-test to compare the reading speed of twins using 15 sets of twins, and get a p-value of 0.02, what does this mean for a type I error of 0.05?

Answer 18

Reject H0: twins have the same reading speed