Assume that a sample is used to estimate a population proportion p. Find the 80% confidence interval for a sample of size 375 with 268 successes. Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places. C.I. =

In a survey of 2345 ​adults, 729 say they believe in UFOs.   Construct a 90 % confidence interval for the population proportion of adults who believe in UFOs.   A 90%confidence interval for the population proportion is ​ ​(Round to three decimal places as​ needed.)   Interpret your results. Choose the correct answer below.     A. With 90​% ​confidence, it can be said that the sample proportion of adults who believe in UFOs is between the endpoints of the given confidence interval.   B. With 90​% ​probability, the population proportion of adults who do not believe in UFOs is between the endpoints of the given confidence interval.   C. The endpoints of the given confidence interval shows that 90​% of adults believe in UFOs.   D. With 90% ​confidence, it can be said that the population proportion of adults who believe in UFOs is between the endpoints of the given confidence interval.

Find the sample size needed to estimate the percentage of adults who can wiggle their ears. Use a margin of error of 3 percentage points and use a confidence level of 90%. Complete parts (a) and (b) below. a. Assume that p and q are unknown. n= (Round up to the nearest integer.)

Assume that a sample is used to estimate a population proportion p. Find the 99.5% confidence interval for a sample of size 324 with 230 successes. Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places. 99.5% C.I. =

It is desired to estimate the proportion of cannabis users at a university. What is the sample size required to if we wish to have a 95% confidence in the interval and an error of 10%? 385 68 10 97

Tina catches a 14-pound bass.  She does not know the population mean or standard deviation.  So she takes a sample of five friends and they say the last bass they caught was 9, 12, 13, 10, and 10 pounds.  Find the t and calculate a 95% (α = .05) confidence interval.

Assume that a sample is used to estimate a population proportion p. Find the 80% confidence interval for a sample of size 392 with 102 successes. Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places. 80% C.I. =

Find the sample size needed to estimate the percentage of adults who can wiggle their ears. Use a margin of error of 5 percentage points and use a confidence level of 90%. Complete parts (a) and (b) below. a. Assume that p and q are unknown. n = (Round up to the nearest integer.)

assume that a sample is used to estimate a population proportion p. find the margin of error E that corresponds to the given statistics and confidence level. 98% confidence; the sample size is 730, of which 30% are successes

Assume that a sample is used to estimate a population proportion p. Find the 95% confidence interval for a sample of size 331 with 182 successes. Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places.C.I. =