Which statement(s) below is(are) accurate?

2. In a log(X) model if X increases by one unit Y decreases by 1.

3. In a log(X) model if X increases by one unit Y increases by 1.

4. Answers 2 and 3.

1. In a log(X) model a a doubling of X results in a change of () in the mean of Y.

If you are a statistical consultant and do a regression of machine output on temperature, why would you report confidence intervals?

Because you cannot rely on the results of a regression models.

Because error terms are not estimable.

Because a point estimate has variance when estimated from a sample.

All answers are correct.