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:_______________

Rider	Rank15	Country	YearBorn	Height	Weight
Joao Ricardo Vieira	1	BRA	1984	66	163
Matt Triplett	2	USA	1991	67	160
J.B. Mauney	3	USA	1987	70	140
Kaique Pacheco	4	BRA	1994	68	145
Nathan Schaper	5	USA	1990	73	160
Valdiron de Oliveira	6	BRA	1979	72	170
Guilherme Marchi	7	BRA	1982	70	180
Silvano Alves	8	BRA	1987	67	150
Reese Cates	9	USA	1989	68	135
J.W. Harris	10	USA	1986	70	160
Stetson Lawrence	11	USA	1988	70	155
Mike Lee	12	USA	1983	68	140
Fabiano Vieira	13	BRA	1982	68	175
Cody Nance	14	USA	1987	68	162
Ben Jones	15	AUS	1979	71	163
Cooper Davis	16	USA	1994	69	150
Tanner Byrne	17	CAN	1992	76	160
Shane Proctor	19	USA	1985	68	165
Renato Nunes	20	BRA	1981	67	135
Mason Lowe	21	USA	1993	71	155
Gage	22	USA	1994	66	145
Chase Outlaw	23	USA	1992	65	150
Kasey Hayes	24	USA	1985	69	140
L.J. Jenkins	25	USA	1987	70	140
Eduardo Aparecido	27	BRA	1990	68	160
Stormy Wing	28	USA	1989	66	145
Ryan Dirteater	30	USA	1989	69	155
Bonner Bolton	31	USA	1987	71	175
Dave Mason	32	AUS	1987	68	154
Brady Sims	33	USA	1993	69	160
Douglas Duncan	35	USA	1987	68	155
Neil Holmes	36	USA	1985	68	145
Tyler Harr	39	USA	1990	70	165
Robson Palermo	40	BRA	1983	66	120
Luis Blanco	41	BRA	1986	68	175
Lachlan Richardson	44	AUS	1992	69	141
Claudio Crisostomo	46	BRA	1985	71	160
Sean Willingham	47	USA	1981	70	140
Thad Newell	51	USA	1985	71	165
Jay Miller	52	USA	1992	66	165
Marco Eguchi	53	BRA	1989	67	135
Austin Meier	55	USA	1987	71	165
Jordan Hupp	58	USA	1985	60	188
Dakota Louis	62	USA	1992	72	160
David Kennedy	66	AUS	1984	69	176
Billy Robinson	66	USA	1979	68	150
Skeeter Kingsolver	70	USA	1989	70	165
Scott Schiffner	75	CAN	1980	68	155
Budd Williamson	77	AUS	1986	72	155
Josh Faircloth	77	USA	1989	70	140
Justin Granger	93	USA	1991	66	115
Dakota Beck	100	USA	1991	67	155
Harve Stewart	104	USA	1987	69	150
Brant Atwood	116	USA	1987	67	140
Ty Pozzobon	148	CAN	1991	69	135
Kody Lostroh	279	USA	1985	66	155
Markus Mariluch	279	USA	1985	68	155
Emilio Resende	279	BRA	1987	67	150