Over 1,200 bull riders from around the world are members

Over 1,200 bull riders from around the world are members of Professional Bull Riders (PBR) and compete in the more than 300 PBR affiliated bull riding events per year. This data set includes information about the top 50 ranked bull riders for the 2013, according to the PBR standings reported in July of 2013. Rankings are based on a system which awards points for qualified rides at events throughout the season. The average American adult man weighs 190 pounds. Below we will answer the question: Do professional bull riders from the US weigh the same as the American adult males?

1. Which variable tells us how much the rider weighs? The variable name in the dataset is:____________________

2. What will the null hypothesis and alternative hypothesis look like for this one-sample t-test?

(i) Null Hypothesis: _________________________

(ii) Alternative Hypothesis: ____________________

3. Report the following sample statistics for the US bull-rider weights.

(i) Sample mean ________________________

(ii) Sample Standard Deviation __________________

4. Report the one-sample t test results:___________

5. Report the p-value: ___________

6. Using 5% level of significance, what is your decision about the null hypothesis based on the results of the one sample t-test?

(i) Reject

(ii) Do Not reject

7. What is your conclusion?

(i) It appears that the bull-riders actually weigh more than the average American man.

(ii) It appears that the bull riders actually weight less than the average American mane.

8. Report the 95% confidence interval for the mean weight: (i) LCL:______________ (ii) UCL:_______________