what are the 95% and 99% confidence intervals for the population mean if the variance is 0.64? given that sample size = 60 sample mean = 11.21.

What are the 95% and 99% confidence intervals for the population mean, if the variance is 0.64? Given that sample size = 60, sample mean = 11.21. => ..

95% confidence interval of a population mean(μ) with a sample size of 60 was found out as 14.5 < μ < 17.6. Another study calculated the 95% confidence interval as 14.3 < μ < 17.8. Which am..

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..

95% confidence interval of a population mean with a sample size of 18 was found out as 6.17 < μ < 6.99. Another study calculated the 95% confidence interval as 5.71 < μ < 7.46. Which among th..

90% confidence interval of a population mean(μ) worked out on a sample size of 50 is, 50 < μ < 56. What is the likely 90% confidence interval of the mean of the same population worked out on a ..

A sample of scores of 250 candidates has a mean of 47.2 with a standard deviation of 18.6. Find 90% and 95% confidence interval of the population mean and determine which is larger? => (45.3, 49.1) and (44.9, 49.5) and 95% or (45..

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 o..

If two samples have means of 30 and 28 and variances of 12 and 14, with 20 and 25 as the sizes, find the z score for difference of two population means. => 2.154 or 2.075 or 2.320 or 1.857..

A manufacturer claims that the rods manufactured in their factory have a diameter of 8.5 cm. A random sample of 80 similar iron bars were tested and found that the mean diameter is 8.43 cm and the variance is 0.032 cm 2 . Is there enough evidence to conclude ..

Select the incorrect statement. I. For a 95% confidence interval for the mean, when the sample size is 26, the value of t ∝ /2 is 2.036. II. For a 98% confidence interval for the mean, when the sample size..