Does Practice Make Perfect?

Training	Performance
27	19
24	16
12	12
22	17
13	10
29	19
14	15
20	14
16	15
21	21
22	14
25	22
23	22
18	15
20	14
15	15
13	16
20	15

Use the Data set PRACTICE, to answer the following questions. It is a sample of eighteen randomly selected factory line workers. Training time (in hours) and Performance time (minutes)

First, create 1) a scatterplot and 2) run a simple regression of PERFORMANCE = F(TRAINING)

A). Interpret the meaning of the intercept Bo and the slope B1 in this problem.

1. B) Still interpreting B1, check if it is statistically significant
2. i) what is its p-value
3. ii) conduct a hypothesis test of the null hypothesis that B1 = 0 What is the T-statistic? Do we reject or fail to reject the null hypothesis at the 0.05 error level?

• What is the 95% confidence interval of B1? Does this include 0? What does it mean?

1. Does the regression line look like it fits the data well?

1. What percent of the variation in PERFORMANCE can be explained by TRAINING?

1. If someone has 20 hours of training, what do we predict their performance time will be?