More on con?dence level and interval width

Assignment Help Basic Statistics

Reference no: EM131011922

1. More on con?dence level and interval width. Refer to Exercise 8.19. Would a 99% con?dence interval be wider or narrower than the one that you found in that exercise? Verify your results by computing the interval.

2. Can we use the z test? In each of the following cases state whether or not the Normal approximation to the binomial should be used for a signi?cance test on the population proportion p.

(a) n = 30 and H0: p = 0.2.

(b) n = 30 and H0: p = 0.6.

(d) n = 200 and H0: p = 0.01.

Reference no: EM131011922

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