what are class intervals

The 95% confidence interval for the mean number of mangoes in a carton is between 48.12 and 51.88. If a random sample of 27 cartons were used to determine this interval, what was the standard deviation? => 2 or 3 or 4 or 5..

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..

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 - 38 in the stem-and-leaf plot? => 9 or 6 or 8 or 7..

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..

The table shows the number of students admitted in a school from 1995 to 2000. If the number of students admitted is taken on the vertical axis, what should be the appropriate interval to draw the graph? Year 1995 1996 1997 1998 1999 2000 Number of Students 78 76 66 72 85 98 => ..

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 or 0.24 < μ &..