Question

Question 3 (1 point)
A random sample of 25 drivers license tests was drawn from the population of all drivers. The sample average score was a 76 with a sample variance of 144. Drivers license test scores are normally distributed, the 99% confidence interval for the average drivers license test score is
Question 3 options:

a)

70.06 to 81.94

b)

69.82 to 82.18

c)

69.29 to 82.71

d)

70.02 to 81.98
Question 4 (1 point)
GGC-2

Researchers take a simple random sample of 81 SUVs traveling on highway 285 showed an average speed of 60 mph. Assume the traveling speed of all SUVs is normally distributed, with a population standard deviation of 13.5 mph.

Refer to Exhibit GGC-2. The 86.9% confidence interval for μ is _____.
Question 4 options:

a)

46.500 to 73.500

b)

57.735 to 62.265

c)

59.131 to 60.869

d)

50 to 70
Question 5 (1 point)
Data on test scores have been standardized into z scores. What is the value of z if the area to the right of z is 0.1401?
Question 5 options:

a)

1.08

b)

0.1401

c)

-1.08

d)

2.16

Answer 1