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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

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:_______________

RiderRank15CountryYearBornHeightWeight
Joao Ricardo Vieira1BRA198466163
Matt Triplett2USA199167160
J.B. Mauney3USA198770140
Kaique Pacheco4BRA199468145
Nathan Schaper5USA199073160
Valdiron de Oliveira6BRA197972170
Guilherme Marchi7BRA198270180
Silvano Alves8BRA198767150
Reese Cates9USA198968135
J.W. Harris10USA198670160
Stetson Lawrence11USA198870155
Mike Lee12USA198368140
Fabiano Vieira13BRA198268175
Cody Nance14USA198768162
Ben Jones15AUS197971163
Cooper Davis16USA199469150
Tanner Byrne17CAN199276160
Shane Proctor19USA198568165
Renato Nunes20BRA198167135
Mason Lowe21USA199371155
Gage22USA199466145
Chase Outlaw23USA199265150
Kasey Hayes24USA198569140
L.J. Jenkins25USA198770140
Eduardo Aparecido27BRA199068160
Stormy Wing28USA198966145
Ryan Dirteater30USA198969155
Bonner Bolton31USA198771175
Dave Mason32AUS198768154
Brady Sims33USA199369160
Douglas Duncan35USA198768155
Neil Holmes36USA198568145
Tyler Harr39USA199070165
Robson Palermo40BRA198366120
Luis Blanco41BRA198668175
Lachlan Richardson44AUS199269141
Claudio Crisostomo46BRA198571160
Sean Willingham47USA198170140
Thad Newell51USA198571165
Jay Miller52USA199266165
Marco Eguchi53BRA198967135
Austin Meier55USA198771165
Jordan Hupp58USA198560188
Dakota Louis62USA199272160
David Kennedy66AUS198469176
Billy Robinson66USA197968150
Skeeter Kingsolver70USA198970165
Scott Schiffner75CAN198068155
Budd Williamson77AUS198672155
Josh Faircloth77USA198970140
Justin Granger93USA199166115
Dakota Beck100USA199167155
Harve Stewart104USA198769150
Brant Atwood116USA198767140
Ty Pozzobon148CAN199169135
Kody Lostroh279USA198566155
Markus Mariluch279USA198568155
Emilio Resende279BRA198767150

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