class intervals

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 as population mean. => I only ..

The 95% confidence interval for the mean number of tablets in a bottle of calcium tablets is between 149.04 and 150.96. The standard deviation is 3 tablets. Find the size of the random sample that was used to determine this interval. => 40 or 38 or 6 or 150..

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..

A sample of the reading scores of 35 sixth graders has a mean of 82. If the 95% confidence interval for the population mean of the reading scores of all fifth graders is between 77 and 87, then which among the following choices represents the 99% confidence interval? => 74 < ..

How many leaves are there in the interval 20 - 32 in the stem-and-leaf plot? => 6 or 7 or 5 or 4..

How many leaves are there in the interval 20 - 44 in the stem-and-leaf plot? => 10 or 8 or 9 or 7..

Approximate the area under the given curve over the interval [-2, 2] by using 8 rectangles using LRAM. => 6 square units or 3 square units or 4 square units or 7.5 square units..

Convert interval notation [- 2, 2] to inequality notation. => - 2 ≤ x ≤ 2 or - 2 < x < 2 or - 2 > x > 2 or - 2 ≤ x < 2..

Convert interval notation [- 3, 0] to inequality notation. => - 3 < x < 0 or - 3 ≤ x ≤ 0 or - 3 > x > 0 or - 3 ≤ x < 0..

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 sample size of 100? => 25 < μ < 28 or 51 < μ < 55 or 100..