Central Day School, a charter school dedicated to teaching first and second grade students, collected data on their students' favorite ice cream flavors; the results are presented in the crosstabulation below and to the left.
|
|
Chocolate
|
Strawberry
|
|
|
First Grade
|
70
|
26
|
|
|
Second Grade
|
60
|
44
|
|
|
|
|
|
|
a) Use the blank table above and to the right to create a joint probability table.
b) Are the events "the student is in second grade" and "the student prefers chocolate ice cream" dependent or independent? Justify your answer.