A manufacturer of personal computers purchases disk drives from five different companies. According.

A manufacturer of personal computers purchases disk
drives from five different companies. According to the claims of these five
companies, the following table lists their percentage of defective hard drives:

To monitor these percentages, the company keeps careful
records of the defective hard drives for each of the five companies. The
following table lists the total number of defective disks:

(a). State H_{o} and H_{a}.

(b). Complete the table:

(c). Compute χ^{2}. For α = 0.05, would
the null hypothesis be rejected? Explain.

(d). For α = 0.01, would the null hypothesis be
rejected? Explain.