21.) X has a uniform distribution from 5 to 10. What is f(x)?

a) 0

b) 1/5

c) 1/10

d) Not enough information to tell.

22.) Suppose 90% of OSU students own an iPad. You take a random sample of 2 OSU students and let X = the number of students in the sample who own an iPad. What's the chance that X is exactly 1?

a) 0.90

b) 0.18

c) 0.09

d) 0.19

e) Not enough information to tell.

23.) The t-value in a confidence interval for mu when sigma is unknown is larger than the Z-value in a confidence interval for mu when sigma is known. Assume everything else is the same

a) True

b) False

24.) Suppose someone reports that the average gas price in Ohio is $3.85 and you believe it's less than that. You sample 31 gas stations at random in Ohio and calculate the sample mean, $3.77, and sample standard deviation, $0.35. What is the test statistic?

a) 3.77

b) Not enough information to tell.

c) 1.27

d) -1.27

e) -.23

25.) Which of the following statements is FALSE?

a) Statement 3: The margin of error decreases if the confidence level decreases.

b) None of these three statements are false.

c) Statement 2: The margin of error decreases if the standard deviation were to decrease.

d) All three statements are false.

e) Statement 1: The margin of error increases if n were to increase.