The following information was obtained from matched samples taken from two populations. The daily production rates for a sample of workers before and after a training program are shown below. Assume the population of differences is normally distributed. Worker Before After 1 19 23 2 24 24 3 26 28 4 22 21 5 21 26 6 19 20 7 16 19

The following information was obtained from matched samples taken from two populations. The daily production rates for a sample of workers before and after a training program are shown below. Assume the population of differences is normally distributed. Worker Before After 1 19 23 2 24 24 3 26 28 4 22 21 5 21 26 6 19 20 7 16 19

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.1: Measures Of Center

Problem 9PPS

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Question

Worker	Before	After
1	19	23
2	24	24
3	26	28
4	22	21
5	21	26
6	19	20
7	16	19

Find the point estimate for the difference between the population means for the rates after the program and before the program.

answers:

−2

−1

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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