Unit 2 Quiz #1: Pesky Statistics Terminology

25+30+25+22+26 = 128
128 ➗5 = 25.6

25.6 is an example of: 

• The median

• The mode

• The mean

• The standard deviation

A. Patients who take Tylenol daily will have increased liver enzymes compared to placebo.

B. Patients who take Tylenol daily will have no changes in liver enzymes compared to placebo.

Which one is the Null Hypothesis?

• A

• B

• C

• Wait...there's more?

Sugar intake affects cavity creation in 12-15 year old girls.

The independent variable is:

• 12-15 year old girls

• cavity creation

• sugar intake

• None of the above

If your alternative hypothesis is NON-directional, which result would you look for on an Excel output?

• Only the t-stat

• One-tail results

• Two-tail results

• One or Two tail results

Alpha = 0.05

p = 0.71

Reject or fail to reject the null hypothesis?

• Reject!

• Fail to reject!

• Accept!

• Run away!

Data analysis results = p < 0.001

Alpha is set to 0.01

Interpret.

• Data is statistically significant

• Data is not statistically significant

• We fail to reject the null hypothesis

• Reject the null hypothesis

Which of the following is the p-value for a NON-directional alternative hypothesis?

• 0.374745

• 1.739607

• 0.74949

• 2.109816

I want to see if caffeine has an impact on test scores in P5. I give P5 a test, wait a couple of hours, then give everyone a cup of coffee. Then, I test the same students 20 minutes after drinking the coffee. What type of test is this?

• Independent t-test

• Dependent t-test

• f-test

• p-value test

If we fail to reject the null hypothesis, the difference in results between two groups most likely happened due to chance.

• True

• False

If the researcher states that their alternative hypothesis shows that the mean of group 1 will be greater than the mean of group 2, we call this hypothesis:

• Randomized Controlled Trial

• Null hypothesis

• Nondirectional alternative hypothesis

• Directional alternative hypothesis