Final review (stats 2220)

Question 1

Which of the following sets of four numbers has the smallest possible standard deviation?

Accepted Answer

5,5,5,5,5

Question 2

Your statistics instructor is:

Accepted Answer

cool, great, awesome, all of those above

Question 3

Which statement is true about Coefficient of Determination, r2:

Accepted Answer

% of variation in y that can be explained by the linear relationship with x

Question 4

A 95% confidence interval for the mean lifetime of a set of tires as (4000, 4500). Based on this interval, I know

Accepted Answer

Both answers above are correct

Question 5

Lower confident level gives narrower confident interval (think 90% vs 99%)

Accepted Answer

True

Question 6

Event A occurs with probability 0.2. Event B occurs with probability 0.9. Events A and B

Accepted Answer

cannot be disjoint.

Question 7

CLT states: the sample size increases, the sample mean gets closer and closer to the population mean

Accepted Answer

True

Questions 7