Questions from Statistics Principles

Q: For each situation, state if a binomial distribution is reasonable for

For each situation, state if a binomial distribution is reasonable for the random variable X. Justify your answer. (a) A multiple-choice examination consists of 10 problems, each of which has 5 sugge...

Q: A school newspaper claims that 70% of the students support its

A school newspaper claims that 70% of the students support its view on a campus issue. A random sample of 20 students is taken, and 10 students agree with the newspaper. Find P[10 or less agree] if 70...

Q: At one large midwest university, about 40% of the college

At one large midwest university, about 40% of the college seniors have a social science major. Fourteen seniors are selected at random. Let X denote the number that have a social science major. Determ...

Q: Refer to the population of social science majors in Exercise 5.

Refer to the population of social science majors in Exercise 5.115 but change the sample size to n = 5. Using the binomial table, (a) List the probability distribution. (b) Plot the probability hist...

Q: For a binomial distribution with p = .15, find the

For a binomial distribution with p = .15, find the smallest number n such that 1 success is more probable than no successes in n trials.

Q: Only 30% of the people in a large city feel that

Only 30% of the people in a large city feel that its mass transit system is adequate. If 20 persons are selected at random, find the probability that 10 or more will feel that the system is adequate....

Q: Jones claims to have extrasensory perception (ESP). In order to

Jones claims to have extrasensory perception (ESP). In order to test the claim, a psychologist shows Jones five cards that carry different pictures. Then Jones is blindfolded and the psychologist sele...

Q: A Poisson distribution describes X = the number of bad checks a

A Poisson distribution describes X = the number of bad checks a mega-store receives each day. If this store receives an average of 2 bad checks per day, (a) Find the mean and variance. What are the p...

Q: Among the library's books purchased in the past three years, 1

Among the library's books purchased in the past three years, 1.2 % cannot be located. A random sample of 150 books is selected from a much larger number purchased in the last three years. Approximate...

Q: An inspector samples bags of potato chips to see if they fall

An inspector samples bags of potato chips to see if they fall short of the weight, 14 ounces, printed on the bag. Samples of 20 bags are selected and the number with weight less than 14 ounces is reco...