18. Hypothesis Testing

Question 1

Dorian the kitty cat meows when people are in the hallway. He is meowing at the door today, and no one is in the hallway. What type of error did he commit? (MG)

A. Type I
B. Type II
C. False Negative
D. True Positive

Answer 1

A. Type I

= false positive

Question 2

Falsely rejecting the null hypothesis is what type of error? (MG)

A. Type I
B. Type II
C. False Negative
D. True Positive

Answer 2

A. Type I

Question 3

A fire is started by your brilliant roommate trying to make popcorn. The fire alarm does not go off. This is an example of what type of error?

A. Type 1
B. Type 2
C. True Positive
D. True Negative

SZ

Answer 3

Ans. B Type 2

A Type 2 error is when the null is false and the test supports the null. It is a false negative. There is a fire which is dangerous but there is not an alarm to warn you.

Question 4

A study finds that exercising by walking 30 minutes a day is associated with a 45% decrease in future heart attack in men over 60 years of age. p= 0.045. Which of the following is a true?

A. Statistically significant and clinically significant
B. Statistically insignificant and clinically significant
C. Statistically significant and clinically insignificant
D. Statistically insignificant and clinically insignificant
E. None of the above

SZ

Answer 4

Ans. A Statistically significant and clinically significant

A p value of less than 0.045 rejects the null, meaning it is statistically significant. A 45% decrease in heat attack is clinically significant.

Question 5

A study is done on how many bagels are eaten by people in a month. The mean is found to be 7, the SD is 3. If a man has a Z score of +2 how many bagels does he eat?

A.15
B.13
C.1
D.7
E.9

RFA

Answer 5

Ans B. = 13

Z score of +2 is two SDs from the mean 7+3x2=13

Question 6

A study has a p= .00002 is this Clinically relevant?

A. Yes
B. No
C. Maybe

RFA

Answer 6

C. Maybe- P value gives us no determination of clinical relevance.