e 30. The first of two sub-groups has 10 items with mean 15 and standarddeviation 3. If the whole group has 250 items. with mean 15.6 and standard deviationV13.44, find the standard deviation of the second.sub-group.00081

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Answered: 30. The first of two sub-groups has 10…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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9. The number of births per woman in China is 1.6 down from 5.91 in 1966. This fertility rate has been attributed to the law passed in 1979 restricting births to one per woman. Suppose that a group of students studied whether or not the standard deviation of births per woman was greater than 0.75. They asked 50 women across China the number of births they had had. The results are shown in the following table. Does the students’ survey indicate that the standard deviation is greater than 0.75? Use α = 0.01. # of Births Frequency 0 5 1 30 2 10 3 5
A data set consists of the 11 data points shown below, plus one additional data point. When the additional point is included in the data set, the sample standard deviation of the 12 points is computed to be 15.225. If it is known that the additional data point is 25 or less, find the value of the twelfth data point. 48, 42, 12, 56, 33, 23, 24, 21, 37, 21, 27 Value of the additional data point =
24.
When I need to determine which standard deviation would give the better grade, what if the z-score is negative such as -.8 and -.4. Wouldn't the .-4 score provide a better grade because it's closer to m=42? The oridinga score is 38 and the mean is 42 but there are two standard deviation scores of 5 (answer was -.8) and 10 (answer was -.4) and I need to decide which one give the better grade.
14.
Suppose that you have a set of data that has a mean of 34 and a standard deviation of 6. a) Is the point 28 above, below, or the same as the mean. How many standard deviations is 28 from the mean. b) Is the point 46 above, below, or the same as the mean. How many standard deviations is 46 from the mean. c) Is the point 43 above, below, or the same as the mean. How many standard deviations is 43 from the mean. d) Is the point 20 above, below, or the same as the mean. How many standard deviations is 20 from the mean.
suppose that a category of world-class runners are known to run a marathon (26 miles) in an average of 143 minutes with a standard deviation of 14 minutes. consider 49 of the races. Let x̅ = the average of the 49 races. I need help finding the median of the average running times. if someone could explain how to solve this problem that would be great
17.
In one math class, the first exam had an average score of 81.2% with a standard deviation of 10.9%. The second exam had a mean score of 79.3%, with a standard deviation of 19.9%. Based on these numbers, tell whether each statement is true or false. 1. There were probably some students that took a zero on Exam 1. The statement is ▼(Choose one(True/False)). 2. Most students did better on the second exam. The statement is ▼(Choose one(True/False)).

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30. The first of two sub-groups has 10 items with mean 15 and standard deviation 3. If the whole group has 250 items. with mean 15.6 and standard deviation V13.44, find the standard deviation of the second. sub-group.