Author Question: Elizabeth has just put 4 new spark plugs in her car. For each spark plug, the probability that it ... (Read 107 times)

brutforce · **on:** Jul 24, 2018

Elizabeth has just put 4 new spark plugs in her car. For each spark plug, the probability that it will fail in the next 50,000 miles is 1/100 (which is 0.01), and is independent from one spark plug to the next. What is the probability that none of the spark plugs will fail in the next 50,000 miles?
a. (0.01)(0.01)(0.01)(0.01)
b. 1 - (0.01)(0.01)(0.01)(0.01)
c. (0.99)(0.99)(0.99)(0.99)
d. 1 - (0.99)(0.99)(0.99)(0.99)

Question 2

In a nationwide survey of n = 1,030 adults, 6 answered yes to the question During the last year did anyone break into or somehow illegally get into your home or apartment? A 90 confidence interval for the proportion of all Americans who had their homes broken into is
a. 0.048 to 0.072
b. 0.045 to 0.075
c. 0.043 to 0.077
d. 0.041 to 0.079