Justin (varsity football captain) and Joe (varsity wresting captain) investigate the preference between two NBA superstars. Who do students prefer? The data suggest that lower classmen prefer Lebron James while upper classmen prefer Michael Jordan.

1. MJ vs. LBJ
By: Joseph Osorio
&
Justin Sloan

2. Is there a preference between Michael Jordan or
Lebron James based on grades level?

3. Random Samples (met)
Independent (met)
Normality (met)
Conditions

4. Proportions
n=110 (sample size)
MJ= 85/110
LJ= 25/110

5. Chi-Square Test
Ho: Pick + Grade are Ha: Not Independent
Independent
Grade Level Michael Lebron James
Jordan
9 14 (18.5) 10 (5.5)
10 18 (20.1) 8 (5.9)
11 22 (19.3) 3 (5.7)
12 31 (27.0) 4 (8)

6. Younger students tend to pick
Lebron James

7. Older students tend to pick
Michael Jordan

8. 1-Proportion Z Test
Since our p-value is low, we reject Ho.

9. Jordan Wins !!!

10. Convenience Sampling
Doesn’t Care
◦ (Doesn’t like basketball)
Potential Errors

11. MJ vs. LBJ
By: Joseph Osorio
&
Justin Sloan