Easy statistics homework

Question 1

Question 2

The result of tossing a coin once will be either head or tail. Let A and B be the events of observing head and tail, respectively. The events A and B are:

A.unilateral

B.mutually exclusive

C.independent

D.conditional

Question 3

If A and B are mutually exclusive events with P(A) = 0.30 and P(B) = 0.40, then the probability that either A or B or both occur is:

A.0.12

B.0.10

C.0.30

D.0.70

Question 4

Which of following statements are true regarding the probability distribution of a random variable X?

A.The probabilities must be nonnegative

B.The probabilities must sum to 1

C.The random variable must be continuous

D.Both (a) and (b)

Question 5

Question 6

A discrete probability distribution:

A.is the distribution of multiple random variables
B.can be estimated from long-run proportions
C.is a tool that can be used to incorporate uncertainty into models
D.lists all of the possible values of the random variable and their corresponding probabilities Question 7 The mean of a probability distribution is a: A.measure of variability of the distribution B.measure of central location C.measure of skewness of the distribution D.measure of relative likelihood
Question 8

The standard deviation of a probability distribution must be:

A.a number between 0 and 1
B.a negative number
C.less than the value of the mean
D.a nonnegative number
Question 9

Question 10

Question 11

Question 12

Using the standard normal curve, the Z- score representing the 75th percentile is approximately 0.674.

True

False