During a recent drought, a water utility in a certain town sampled 100 residential water bills and found that 79 of the residences had reduced their water consumption over that of the previous year. Find a 99% confidence interval for the proportion of residences that reduced their water consumption. Round the answers to three decimal places. The 99% confidence interval is

Q: If n=13, (x-bar)=48, and s=12, construct a confidence interval at a 95% confidence level. Assume the…

A: Mean = 48Standard deviation = 12Sample size = 13

Q: sample of 35 students was taken from the local university. These students spent an average of $180…

A:

Q: A sample of 500 applications to a nursing programme included 400 applications from women with the…

A: Given Information: Sample size n=500 If 400 were applications from women, then 500-400=100…

Q: The 90% confidence interval is from to. (Round to three decimal places as needed.)

A: A poll of 1030 adults in a country was conducted by telephone. Of those surveyed, 139 had…

Q: What is the value of Z for this confidence interval?

A: Given,sample size(n)=14795no.of people who said yes=2219no.of people who said no =12576

Q: In a sample of 300 people, 154 said that they watched news on television. Find the 90% confidence…

A: According to the given information in this question We need to find the 90% confidence interval of…

Q: In a sample of 310 adults, 177 had children. Construct a 87% confidence interval for the true…

A: Find z-critical value:…

Q: If n 28, = 37, and s = 6.2, construct a confidence interval at a 97% confidence level. Assume the…

A: Solution: The following information is given to us: s=6.2 n =28 A 97% confidence interval is…

Q: In a random sample of 145 students, we find that 53% have attended a baseball game at some point in…

A: Given,sample size (n)=145sample proportion(p^)=0.53α=1-0.95=0.05α2 =0.025z0.025 =1.96

Q: An environmentalist wants to find out the fraction of oil tankers that have spills each month.…

A: The sample proportion oil tankers that have spills each month is, The level of significance is,…

Q: If n = 440 and X = 352, construct a 90% confidence interval for the population proportion, p. Give…

A:

Q: thirty randomly selected students took the calculus final. if the sample mean was 91 and the…

A:

Q: Find the margin of error for the​ 99% confidence interval used to estimate the population…

A: The random variable X follows normal distribution. The sample size is 1100. The proportion value is…

Q: Suppose you compute a 93% confidence interval. What will happen to the confidence interval if you…

A: Increasing the confidence level increases the margin of error. This will increase the width or range…