Express the confidence interval 0.666 less than pless than 0.888 in the form Modifying Above p with caret plus or minus Upper E.

Use the given confidence interval to find the point estimate ?̂p^.   0.14<?<0.84

A random sample of 22 commercials made since the year 2010 have a mean length of 25 seconds with a standard deviation of 14 seconds.   The margin of error that corresponds to a 90% confidence interval for the mean length of all commercials made since 2010 is   A similar study to the one above was conducted, and the interval was found to be (14.1, 24.1). Can we claim that the mean length of all commercials made since 2010 is more than 15 seconds?

An article claims that babies spend twice as much time in REM (rapid eye movement) sleep than adults. This implies that babies have an average of 6 hours of REM sleep per night. A doctor would like to test the hypotheses = 6 versus  ≠ 6 where  = the true mean amount of REM sleep per night for babies. A 95% confidence interval for the true mean amount of REM sleep per night for babies is (5.45, 6.25) hours. Based on the confidence interval, what conclusion would you make for a test of these hypotheses? The 95% confidence interval  include  as a plausible value, so we  H0. We  convincing evidence that the true mean amount of REM sleep per night for babies  6 hours.

According to statistics released by CNBC, the number of vehicles that are not insured is staggering. CNBC's sample results indicate that 44 out of 80 vehicles were uninsured. Give a 95% confidence interval for the population proportion of the form p^ ± E where p^ is the point estimator of the proportion and E is the margin of error. Select one: a. The interval is 0.450 ± 0.109. b. The interval is 0.550 ± 0.143. c. The interval is 0.450 ± 0.091. d. The interval is 0.550 ± 0.091. e. The interval is 0.550 ± 0.109.

Quon wants to advertise how many chocolate chips are in each Big Chip cookie at his bakery. He randomly selects a sample of 69 cookies and finds that the number of chocolate chips per cookie in the sample has a mean of 10.2 and a standard deviation of 3.5. What is the 95% confidence interval for the number of chocolate chips per cookie for Big Chip cookies? Assume the data is from a normally distributed population. Round answers to 3 decimal places where possible. <μ<

An SRS of 350 high school seniors gained an average of ?⎯⎯⎯=45points in their second attempt at the SAT Mathematics exam. Assume that the change in score has a Normal distribution with standard deviation ?=26.deviation      Find a 90% confidence interval for ?� based on this sample. Give your answers to three decimal places. What is the lower bound?     What is the upper bound ?

The people who survived the titani are more from lower class department than upper class department. A sample of 200 people of upper class department who survived with a mean age of 28 and standard deviation of 1.6 and a sample of 505 people of lower class department who survived with a mean age of 35 and standard deviation of 1.2.Test the hypothesis wih 0.05 level of significance?

A simple random sample of 30 has been collected from a population for which it is known that s = 10.0. The sample mean has been calculated as 240.0. Construct and interpret the 90% and 95% confidence intervals for the population mean.   i'would like to chcek my home work. Not point !

Milan n.n