Karen, Stephanie, and Aaron investigated the association between gender and fries preference. They also drew inference on which brand of fries is most preferable among the three choices.

1. FIGHT OF THE FRIES
AVILA MENDIETA SANDOVAL
Whose fries will meet their demise?

2. •Originally called Insta-Burger
•Dubbed Burger King in 1955
by Dave Edgerton and James
McLamore.
Nutritional Facts
Large Fries
Calories: 500
Sodium: 820mg Large Fries
Fat: 28g
$2.49

3. Large Fries
$2.19
Nutritional Facts
• Founded in 1948 by Dick Large Fries
and Mac McDonald. Calories: 500
Sodium: 350mg
• Franchised by Ray Kroc Fat: 25g
in 1954

4. •Founded by Robert O.
Peterson in 1951.
• Originally named Topsy’s
Drive- In.
Nutritional Facts
Large Fries
Calories: 580
Large Fries Sodium: 960mg
$2.38 Fat: 28g

5. Are Gender & French Fry Preference
INDEPENDENT?
Ho: Gender and French fry preference are
INDEPENDENT.
Ha: Gender and French fry preference are
NOT INDEPENDENT.

6. Testing

8. Hypotheses
Ho: Gender and fries preference
are independent.
Ha: Gender and fries preference
are not independent.

9. We Will Run A…

10. Conditions
Random
Independent
Normal

11. McDonald’s Jack in the Burger King Total
Box
Female 8 16 1 25
Expected
(7.5) (15.5) (2)
Male 7 15 3 25
Expected
(7.5) (15.5) (2)
Total 15 31 4 50

12. CALCULATIONS
χ = 1.1
2
p -value = 0.58
df = 2

13. Conclusion
Because our p-value was high….
We fail to reject the Ho,
we cannot conclude Ha.

14. We Will Run A…

15. Hypotheses
Ho: The 3 brands are equally
preferred. (1/3)
Ha: Jack in the Box fries are
more preferred. (>1/3)

16. McDonald’s Jack in the Burger King Total
Box
Observed 15 31 4 50
Expected (16.67) (16.67) (16.67) 50

17. CALCULATIONS
χ = 22.12
2
p -value ≈ 0
df = 2

18. Conclusion
Because our p-value was low….
We reject the Ho,
Jack in the Box fries are more
preferred.

19. Potential ERRORS
•Fries got cold after awhile.
•Not very fresh.
•Subjects tried to figure out what
restaurant the fries came from
and based their decision on their
favorite restaurant.

20. FIGHT OF THE FRIES
AVILA MENDIETA SANDOVAL
Whose fries will meet their demise?