__________ occurs between two variables when one tends to decrease as the other increases.
A) no association B) a curvilinear association
C) a positive association D) a negative association
Q. 2The number of road construction projects that take place at any one time in a certain city follows a Poisson distribution with a mean of 7. Find the probability that more than four road construction projects are currently taking place in the city.
A) 0.827008 B) 0.081765 C) 0.918235 D) 0.172992
Q. 3Based on this data, how many days out of 200 warm days would you expect to be cloudy?
A) cannot determine B) 60 C) 120 D) .6
Q. 4The number of road construction projects that take place at any one time in a certain city follows a Poisson distribution with a mean of 3. Find the probability that exactly six road construction projects are currently taking place in this city.
A) 0.014936 B) 0.089235 C) 0.301168 D) 0.050409
Q. 5For two events A and B, suppose P(A ) = 0.7, P(B) = 0.6, and P(A B) = 0.5. Then P(A B) = 0.8.
Indicate whether the statement is true or false
Q. 6What is the relative frequency of cloudy days that are cold?
A) .4 B) .8 C) .2 D) .6