to check weather silicon chip sales are independent of where the economy is in the business cycle, data have been collected on the weekly sales of zeppy chippy, a silicon valley firm and on weather the economy was nsing to cycle peak at a peak falling a cycle through, or at acycle trough. the results are

Weekly Chip Sales

Economy High Medium Low Total

At peak 20 7 3 30

At trough 30 40 30 100

Rising 20 08 02 30

Falling 30 05 05 40

Total 100 60 40 200

a. State the Null & Alternate hypothesis

b. Calculate The X 2(Chi- Square) Value.

c. At 0.10 significance level, what is your conclusion?