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LCD screen manufacturer tests a random sample of 500 screens and finds 32 defective units. a)...

LCD screen manufacturer tests a random sample of 500 screens and finds 32 defective units.

a) (7 pts) Find a 98% confidence interval to estimate the proportion of defective units and indicate the margin of error for your estimate.

b) (5 pts) What should be the size of the sample to obtain a maximum margin of error of 0.02, with a confidence level of 98%?

c) (5 pts) Assume that the sample is taken from a batch of 4000 LCD screens. Recalculate the interval of confidence required in a) and indicate the corresponding margin of error

Math   Statistics-And-Probability   
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