BlackFriday 2024! Hurry Up, Grab the Special Discount - Save 25% - Ends In 00:00:00 Coupon code: SAVE25
Welcome to Pass4Success

- Free Preparation Discussions

PRMIA Exam 8002 Topic 2 Question 94 Discussion

Actual exam question for PRMIA's 8002 exam
Question #: 94
Topic #: 2
[All 8002 Questions]

You are to perform a simple linear regression using the dependent variable Y and the independent variable X (Y = a + bX). Suppose that cov(X,Y)=10, var(X)= 5, and that the mean of X is 1 and the mean of Y is 2. What are the values for the regression parameters a and b?

Show Suggested Answer Hide Answer
Suggested Answer: D

Contribute your Thoughts:

Marg
5 days ago
Okay, let's get this straight. If the covariance is 10 and the variance of X is 5, then the slope b is definitely 0.5. Now, the y-intercept a... Hmm, I'm feeling saucy today, so I'm gonna go with C) b=2, a=4. Why? Because I like to keep the examiners on their toes!
upvoted 0 times
...
Kristine
8 days ago
Oof, regression analysis? More like regression headache, am I right? Anyway, let's see here... If the mean of X is 1 and the mean of Y is 2, and the covariance is 10, then the slope b must be 0.5. As for the y-intercept a, I'm gonna have to go with B) b=0.5, a=1.5. Nailed it, I think?
upvoted 0 times
...
Vallie
14 days ago
Hmm, this looks tricky. I'm gonna go with C) b=2, a=4. Why? Because I like the sound of those big numbers, and who doesn't love a confident answer, right? Time to impress the examiner!
upvoted 0 times
Annamaria
2 days ago
I think the answer is A) b=0.5, a=2.5
upvoted 0 times
...
...
Carole
18 days ago
I disagree, I believe the answer is B) b=0.5, a=1.5 because of the covariance between X and Y.
upvoted 0 times
...
Amos
21 days ago
I think the answer is A) b=0.5, a=2.5 because the mean of Y is 2 and the mean of X is 1.
upvoted 0 times
...
Tony
22 days ago
Alright, let's think this through. If cov(X,Y)=10 and var(X)=5, then the slope b must be 0.5. Now, we just need to find the y-intercept a. With the means of X and Y being 1 and 2 respectively, I'd say the answer is B) b=0.5, a=1.5. Easy peasy!
upvoted 0 times
Marci
8 days ago
So, the answer is B) b=0.5, a=1.5.
upvoted 0 times
...
Nicolette
9 days ago
With the means of X and Y being 1 and 2, the y-intercept a must be 1.5.
upvoted 0 times
...
Kattie
10 days ago
I think the slope b is 0.5 because cov(X,Y)=10 and var(X)=5.
upvoted 0 times
...
...

Save Cancel