Some people who bought X-Game gaming systems complained about having received defective systems. The industry standard for such systems has been ninety-eight percent non-defective systems. In a sample of 120 units sold, 6 units were defective. a.

Compute the proportion of defective items in the sample.

b.

Compute the standard error.

c.

At 95% confidence using the critical value approach, test to see if the percentage of defective systems produced by X-Game has exceeded the industry standard.

d.

Show that the p-value approach results in the same conclusion as that of part b.