# Question: In a sample of 30 observations the number of successes

In a sample of 30 observations the number of successes equals 18.

a. Construct the 88% confidence interval for the population proportion of successes.

b. Construct the 98% confidence interval for the population proportion of successes.

c. What happens to the margin of error as you move from an 88% confidence interval to a 98% confidence interval?

a. Construct the 88% confidence interval for the population proportion of successes.

b. Construct the 98% confidence interval for the population proportion of successes.

c. What happens to the margin of error as you move from an 88% confidence interval to a 98% confidence interval?

**View Solution:**## Answer to relevant Questions

A survey of 1,026 people asked: “What would you do with an unexpected tax refund?” Forty-seven percent responded that they would pay of debts (Vanity Fair, June 2010).a. At 95% confidence, what is the margin of error?b. ...In an NBC News/Wall Street Journal poll of 1,000 American adults conducted August 5–9, 2010, 44% of respondents approved of the job that Barack Obama was doing in handling the economy.a. Compute the 90% confidence interval ...What is the minimum sample size n required to estimate p with 95% confidence if the desired margin of error E = 0.08 ? The population proportion is estimated as = 0.36 from prior studies. What happens to n if the desired ...A hair salon in Cambridge, Massachusetts, reports that on seven randomly selected weekdays, the number of customers who visited the salon were 40, 30, 28, 22, 36, 16, and 50. It can be assumed that weekday customer visits ...Residents of Hawaii have the longest life expectancies, averaging 81.48 years (http://www.worldlifeexpectancy.com, data retrieved June 4, 2012). A sociologist collects data on the age at death for 50 recently deceased ...Post your question