Q1. The probability that an individual is beautiful is 0.45 and is intelligent is 0.4. The

probability that the individual is either beautiful or intelligent is 0.67. From the

information it can be known that the characters beautiful and intelligent

a. are not mutually exclusive

b. are Independent

c. have 18% chances to occur simultaneously

d. have all characters described in a, b, c

Q2. Variable Z is standard normal variable, the standard normal table shows the

probability P(Z2.17) =0.985. If Z=2.17 is used to calculate the confidence interval (CI)

estimate of population proportion , then level of confidence for the CI will be

a. 97.0%

b. 98.5%

c. 97.5%

d. None given in a, b, c