Identify __ < p < ____.  A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study, 598 babies were​ born, and 299 of them were girls. Use the sample data to construct a 99​% confidence interval estimate of the percentage of girls born. Based on the​ result, does the method appear to be​ effective?

A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n=935 and x=561 who said "yes." Use a 95% confidence level.

A quality-conscious disk manufacturer wishes to know the fraction of disks his company makes which are defective. Step 2 of 2:  Suppose a sample of 542 floppy disks is drawn. Of these disks, 37 were defective. Using the data, construct the 95% confidence interval for the population proportion of disks which are defective. Round your answers to three decimal places.

A study determined that 60% of women older than age 50 have annual mammograms. A researcher believes that the 60% rate is no longer valid and the proportion should be higher. To see if this proportion is still valid, he surveys 100 women, 75 of whom say they have annual mammograms. if a=0.05, caculate the sample proportion, confidence interval, margin of error, and p value.

A survey​ asked, "How many tattoos do you currently have on your​ body?" Of the 1205 males​ surveyed, 199 responded that they had at least one tattoo. Of the 1030 females​ surveyed, 127 responded that they had at least one tattoo. Construct a 99​% confidence interval to judge whether the proportion of males that have at least one tattoo differs significantly from the proportion of females that have at least one tattoo. Interpret the interval. Let p1 represent the proportion of males with tattoos and p2 represent the proportion of females with tattoos. Find the 99​% confidence interval for p1−p2.   The lower bound is nothing. The upper bound is nothing. ​(Round to three decimal places as​ needed.)

A survey of 240 teachers found that two-thirds of those surveyed do not live in Sydney. Can you conclude statistically that the population proportion who do not live in Sydney is less than ​0.75? Use a​ 95% confidence interval. What is the confidence interval and is 0.75 within the interval?

The question was asking for 99% confidence interval for pop

When solving a problem related to one sample and the confidence interval of variance. Suppose the sample size is n. What is the degree of freedom we will use?

Online News In a Harris poll of 2036 adults, 40% said that they prefer to get their news online. Construct a 95% confidence interval estimate of the percentage of all adults who say that they prefer to get their news online. Can we safely say that fewer than 50% of adults prefer to get their news online?