what does a confidence interval

The formula for the confidence interval for a variance is _________ . => IV. or II. or III. or I...

The formula for the confidence interval for a standard deviation is ________ . => III or II or IV or I..

A report states that the average height of females in the U.S who are in between 18 and 25 years of age are approximately 64.8 inches. The mean of the height of 10 females in the age group of 18 to 25 years is found as 62.4 inches with a standard deviation of 2.5 inches. Can one reject the report a..

If 95% confidence interval for the average age of the club members is 39 < μ < 41, then which of the following could be 99% confidence interval? => 39.4 < μ < 40.6 or 39.5 < μ < 40.5 or 39 < μ < 41 or 38 < μ < 42 o..

Select the correct statement(s). I. Increase in sample size will make the confidence interval of the population mean wider. II. A 90% confidence interval will be wider than a 99% confidence interval. III. Sample mean can never be the same ..

Select the correct statement(s). I. An interval estimate always contains the value of the parameter being estimated. II. To be more confident that the interval contains the true population mean, the interval shall be more narrow. => I only or II only or none ..

A random sample of 100 similar iron bars manufactured at a factory had a mean diameter of 6.43 mm and a variance of 0.032 mm 2 . Find 95% confidence interval and 99% confidence interval. Which interval is smaller? => (6.40, 6.47) and (6.38, 6.48) an..

The 95% confidence interval for the mean weight of a sack of potatoes is between 4.92 and 5.08. If a random sample of 32 sacks was used to determine this interval, what was the standard deviation? => 0.04 or 0.16 or 3.92 or 0.23..

The 95% confidence interval for the mean number of sheets of paper in a ream is between 452.76 and 447.24. If the standard deviation is 10 papers, find the size of the random sample that was used to determine this interval. => 5.52 or 50 or 1.41 or 7.09..

95% confidence interval of a population mean worked out on a sample size of 10 is, 0.26 < μ < 0.38. What is the likely 95% confidence interval of the mean of the same population worked out on a sample size of 20? => 0.28 < μ < 0.36..