A variable of two populations has a mean of 45 and a standard deviation of 24 for one of the populations and a mean of 45 and a standard deviation of 40 for the other population. Moreover, the variable is normally distributed on each of the two populations. Complete parts (a) through (c). a. For independent samples of size 16 and 25, respectively, determine the mean and standard deviation of x1−x2. The mean of x1−x2 is __________ (Type an integer or a decimal. Do not round.) The standard deviation of x1−x2 is ____________ (Round to four decimal places as needed. b. Can you conclude that the variable x1−x2 is normally distributed? Explain your answer. Choose the correct answer below. A. Yes, since the variable is normally distributed on each of the two populations, x1−x2 is normally distributed. B. No, since x1−x2 must be greater than or equal to 0, the distribution is right skewed, so cannot be normally distributed. C. Yes, x1−x2 is always normally distributed because of the central limit theorem. D. No, x1−x2 is normally distributed only if the sample sizes are large enough. c. Determine the percentage of all pairs of independent samples of sizes 16 and 25, respectively, from the two populations with the property that the difference x1−x2 between the sample means is between −10 and 10.
A variable of two populations has a mean of 45 and a standard deviation of 24 for one of the populations and a mean of 45 and a standard deviation of 40 for the other population. Moreover, the variable is normally distributed on each of the two populations. Complete parts (a) through (c). a. For independent samples of size 16 and 25, respectively, determine the mean and standard deviation of x1−x2. The mean of x1−x2 is __________ (Type an integer or a decimal. Do not round.) The standard deviation of x1−x2 is ____________ (Round to four decimal places as needed. b. Can you conclude that the variable x1−x2 is normally distributed? Explain your answer. Choose the correct answer below. A. Yes, since the variable is normally distributed on each of the two populations, x1−x2 is normally distributed. B. No, since x1−x2 must be greater than or equal to 0, the distribution is right skewed, so cannot be normally distributed. C. Yes, x1−x2 is always normally distributed because of the central limit theorem. D. No, x1−x2 is normally distributed only if the sample sizes are large enough. c. Determine the percentage of all pairs of independent samples of sizes 16 and 25, respectively, from the two populations with the property that the difference x1−x2 between the sample means is between −10 and 10.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 13PPS
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Question
A variable of two populations has a
a. For independent samples of size 16 and 25, respectively, determine the mean and standard deviation of x1−x2.
The mean of x1−x2 is __________
(Type an integer or a decimal. Do not round.)
The standard deviation of x1−x2 is ____________
(Round to four decimal places as needed.
b. Can you conclude that the variable x1−x2 is normally distributed? Explain your answer. Choose the correct answer below.
c. Determine the percentage of all pairs of independent samples of sizes
16 and 25, respectively, from the two populations with the property that the difference x1−x2 between the sample means is between −10 and
10.
_________%
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