A popular small-town ice cream parlor collected data from each of its customers for an entire week during the busy season of summer. The customers were classified as either preferring toppings on their ice cream (called "Toppers") or preferring no toppings (called "No Toppers"). Each customer was asked to indicate which of the three classic ice cream flavors (Vanilla, Strawberry, and Chocolate) they liked the most. Of the 160 Toppers, 40 answered "Vanilla", 30 answered "Strawberry", and 90 answered "Chocolate". Of the 80 No Toppers, 20 answered "Vanilla", 40 answered "Strawberry", and 20 answered "Chocolate". Assume that the ice cream shop was interested in determining whether there was a difference in ice cream preference between Toppers and No Toppers (assume 5% of a type 1 error).

a) Identify the null hypothesis.

1 -Toppers and No Toppers do differ in their preference of ice cream flavor

2 -Customers who prefer "Strawberry" are equally likely to be a Topper or a No Topper

3 -Ice cream preference is dependent on Topping Preference

4- Ice cream preference is independent of Topping preference

b) Indicate the value of the chi-square

Number:

c) What is the correct degree of freedom for this chi-square?

Number: