OLS Autograder (Q1 to Q7)

Student Name

Enter your full name.

Answer all parts, then click “Check Q1”.

It still costs 30¢ to play, but the coin is not fair. Enter the probability of heads that makes the expected value exactly 30¢.

Let X take on values 0 through 4 with equal probability. Enter the expected value and the variance.

The sample is x <- c(1,1,1,2,2,2,2,3,3,3). Enter your estimates for E[X] and Var(X). Also paste the R code you used. Your code should use sum() and length().

Take the line y = 3x + 5.

Enter your values for b1 and b0, then paste the R code you used. Your code should use cov(), var(), and mean().

First paste the R code you used to fit the model. Then fill in the two interpretation blanks.

Download a completion PDF that includes your name, a timestamp, and your score.