One hundred teachers attended a seminar on mathematical problem solving. The attitudes of representative sample of 12 of the teachers were measured before and after the seminar. A positive number for change in attitude indicates that a teacher's attitude toward math became more positive. The twelve change scores are as follows.4; 7; −1; 2; 0; 4; −3; 1; −1; 5; 4; −2Part (a)What is the mean change score? (Round your answer to two decimal places.) Part (b)What is the standard deviation for this sample? (Round your answer to two decimal places.) Part (c)What is the median change score? (Round your answer to one decimal place.) Part (d)Find the change score that is 2.2 standard deviations below the mean. (Round your answer to one decimal place.)

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Description: One hundred teachers attended a seminar on mathematical problem solving. The attitudes of representative sample of 12 of the teachers were measured before and after the seminar. A positive number for change in attitude indicates that a teacher's atti

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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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One hundred teachers attended a seminar on mathematical problem solving. The attitudes of representative sample of 12 of the teachers were measured before and after the seminar. A positive number for change in attitude indicates that a teacher's attitude toward math became more positive. The twelve change scores are as follows.

4; 7; −1; 2; 0; 4; −3; 1; −1; 5; 4; −2

Part (a)

What is the mean change score? (Round your answer to two decimal places.)
Part (b)

What is the standard deviation for this sample? (Round your answer to two decimal places.)
Part (c)

What is the median change score? (Round your answer to one decimal place.)
Part (d)

Find the change score that is 2.2 standard deviations below the mean. (Round your answer to one decimal place.)

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

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