Which one of the following probabilities is a cumulative ...

[oliviahorn72]

Which one of the following probabilities is a cumulative probability?
 a. The probability that there are exactly 4 people with Type O+ blood in a sample of 10 people.
  b. The probability of exactly 3 heads in 6 flips of a coin.
  c. The probability that the accumulated annual rainfall in a certain city next year, rounded to the nearest inch, will be 18 inches.
  d. The probability that a randomly selected woman's height is 67 inches or less.

Question 2

Many people now-a-days use e-mail to communicate with family and friends and as a primary source of communication at their job. Is there a difference between the use of e-mail for men with a college education and those without? A survey in a large city reveals that out of 230 males with a college degree, 212 use e-mail more than twice a day. Out of the 150 without a college education, 122 use e-mail more than twice a day. Calculate a 98 confidence interval for the difference in proportions.

[Silverbeard98]

Answer to Question 1

D

Answer to Question 2

(0.0237, 0.1931)

[oliviahorn72]

Excellent

[mcabuhat]

Gracias!