1. Warm Up
A 2005 study in the journal Nature investigated if “Chimps are Charitable.” Chimps were taught to pull 2 ropes. When one was pulled the chimp pulling the rope received food. When the other rope was pulled both the chimp pulling the rope and a chimp in an adjoining cage received food. The data below shows the number of times, out of 36 trials, that each of 7 chimps chose to pull the rope that dispensed food to both chimps Use this data to construct a 95% confidence interval for the mean number of times out of 36 a chimp will “choose to be charitable.” Based on your answer do you think chimps are charitable?

2. Practice
Do SAT prep classes improve SAT scores? The data below is the score on the SAT math test before and after taking an SAT prep class for 10 randomly selected students. Determine the 95% confidence interval for the mean improvement in SAT math scores after taking a prep class. Student Before After Student Before After

3. Golf Activity
Does a practice shot improve the accuracy of a golf putt? Each “golfer” will have a partner – the person sitting next to you. Each golfer will take 2 golf putts at a target. Your partner will measure and record the distance of each shot from the target in inches (all distances are positive). Write the distances of each of your partner’s shots from the target on the board as an ordered pair (1st shot, 2nd shot)

4. Golf Activity
Construct a 95% confidence interval for the mean difference in distance from the target for the first shot vs. the second shot (1st shot minus 2nd shot). Use the 4 step process. Does your data provide convincing evidence that taking a practice shot improves the accuracy of golfers? I will collect the 4 step process summary and the answer to the final question.