iQuestion 1 (6 points) A 99% confidence interval for the population proportion i

Question

iQuestion 1 (6 points) A 99% confidence interval for the population proportion is found to be confidence level is reduced to 95%, the confidence interval for the population proportion .24 to 0.34. If the becomes wider becomes narrower remains unchanged None of the above answers are correct. Save - Question 2 (7 points) of 150 high school softball players. 24 suffered an injury while playing the sport. Find a right end point (upper limit, upper boundary)of a 90% confidence interval for the population proportion

Explanation / Answer

1) Option-B (becomes narrower)

2) P = 24/150 = 0.16

At 90% cinfidence interval the critical value = 1.645

Cinfidence interval = P +/- Z * sqrt(P * (1 - P)/n)

= 0.16 +/- 1.645 * sqrt(0.16 * (0.84)/150)

= 0.16 +/- 0.05

= 0.11, 0.21

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