Chi-Square Homework

 Trix cereal comes in five fruit flavors, and each flavor has a different shape. A curious student methodically sorted an entire box of cereal and found the following distribution of flavors for the pieces of cereal in the box:

Flavor

Frequency

Grape

530

Lemon

470

Lime

420

Orange

610

Strawberry

585  Test the null hypothesis that the flavors are uniformly distributed versus the alternative that they are not.

13.11 T

RIX ARE FOR

K

IDS

 How are the smoking habits of students related to their parents’ smoking? Here are data from a survey of students in eight Arizona high schools:

Student Smokes Student does not Smoke

Both Parents Smoke 400 1380 One Parent Smokes Neither Parent Smokes 416 188 1823 1168

13.20 S

MOKING BY

T

HEIR

P

ARENTS

S

TUDENTS AND

 A random survey of autos parked in the student lot and the staff lot at a large university classified the brands by country of origin, as seen in the table. Are there differences in the national origins of cars driven by students and staff?

American European Asian

Student

107 33 55

Staff

105 12 47

Cars (not from our book)