MA206 Review

Question 1

Using α = .05, and a 1-sided test: Would you Reject, or Fail to Reject the Null Hypothesis?

Accepted Answer

Reject the Null

Question 2

Based on the below R output: Which predictor variable would you remove first?

Accepted Answer

PopF

Question 3

Given: μx = 3, σx = 0.3, n = 100. What is the distribution and parameters of the sample mean?

Accepted Answer

N(3, 0.03)

Question 4

Based on the below R output: Which variable seems to have the largest effect on the response?

Accepted Answer

PovRateAll

Question 5

A paired t-test will not work if I have ....

Accepted Answer

two sets of independent data.

Question 6

The blue shaded region is defined as what?

Accepted Answer

C ∩ B ∩ A'

Question 7

Based on the below Venn Diagram and Given P(A) = 0.3: What is P(C ∩ B ∩ A')?

Accepted Answer

0.05

Question 8

Random variable X has an exponential distribution with λ = 5. What is P(0.25 ≤ X ≤ 0.65)?

Accepted Answer

.248

Question 9

Given: P(A) = 1/2, P(B) = 13/16, & P(A ∩ B) = 3/8 ... Are A and B independent?

Accepted Answer

No

Question 10

What is the expected value of X?

Accepted Answer

2.1

Question 11

As n increases, the standard error _________

Accepted Answer

decreases.

Question 12

Which distribution is used for discrete random variables?

Accepted Answer

Poisson

Question 13

Based on the below tree, what is P(B'|A')?

Accepted Answer

.9000

Question 14

A 95% CI is _______ than a 99% confidence interval?

Accepted Answer

smaller

Question 15

If f(x) = 1/8 + 3/8*x when 0≤x≤2, what is the cdf along the same range?

Accepted Answer

x/8+3*x2/16

Question 16

A 4-sided die is rolled twice. Event A occurs when the sum of the two rolls is ≥ 4. Find P(A).

Accepted Answer

13/16

Question 17

If the arrival rate = 5 per hr. What is the probability that exactly 4 arrivals occur in 1 hr?

Accepted Answer

0.175

Question 18

Using α = .05, and a 2-sided test: Would you still Reject the Null Hypothesis?

Accepted Answer

No

Question 19

Based on the below tree: The value of 0.1250 would equal what?

Accepted Answer

P(B'∩A)

Question 20

Do you think a LINEAR regression model would be appropriate for the data set?

Accepted Answer

No

Questions 20