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22. A random sample of n=25 scores is selected from a normally distributed population with a mean of 500 and a standard deviation of 100. What is the probability that the sample mean will be less than 490? a. 0.01 b. 0.15 C. 0.30 d. 0.46 20. If all the possible random samples of size n=30 are selected from a population with a mean of 50 and standard deviation of 10 and the mean is computed for each sample, then what shape is expected for the distribution of sample means? a. The sample means tend to form a normal-shaped distribution whether the population is or not. b. The sample means tend to form a normal distribution only if the population distribution is normal. The sample meanns tend to be distributed evely across the scale, forming a rectangular- shaped distribution. c. d. There are thousands of possible samples and it is impossible to predict the shape of the distribution.

22. A random sample of n=25 scores is selected from a normally distributed population with a mean of 500 and a standard deviation of 100. What is the probability that the sample mean will be less than 490? a. 0.01 b. 0.15 C. 0.30 d. 0.46 20. If all the possible random samples of size n=30 are selected from a population with a mean of 50 and standard deviation of 10 and the mean is computed for each sample, then what shape is expected for the distribution of sample means? a. The sample means tend to form a normal-shaped distribution whether the population is or not. b. The sample means tend to form a normal distribution only if the population distribution is normal. The sample meanns tend to be distributed evely across the scale, forming a rectangular- shaped distribution. c. d. There are thousands of possible samples and it is impossible to predict the shape of the distribution.

MATLAB: An Introduction with Applications
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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22. A random sample of n=25 scores is selected from a normally distributed population with a mean of 500 and a standard deviation of 100. What is the probability that the sample mean will be less than 490? a. 0.01 b. 0.15 C. 0.30 d. 0.46
Transcribed Image Text:22. A random sample of n=25 scores is selected from a normally distributed population with a mean of 500 and a standard deviation of 100. What is the probability that the sample mean will be less than 490? a. 0.01 b. 0.15 C. 0.30 d. 0.46
20. If all the possible random samples of size n=30 are selected from a population with a mean of 50 and standard deviation of 10 and the mean is computed for each sample, then what shape is expected for the distribution of sample means? a. The sample means tend to form a normal-shaped distribution whether the population is or not. b. The sample means tend to form a normal distribution only if the population distribution is normal. The sample meanns tend to be distributed evely across the scale, forming a rectangular- shaped distribution. c. d. There are thousands of possible samples and it is impossible to predict the shape of the distribution.
Transcribed Image Text:20. If all the possible random samples of size n=30 are selected from a population with a mean of 50 and standard deviation of 10 and the mean is computed for each sample, then what shape is expected for the distribution of sample means? a. The sample means tend to form a normal-shaped distribution whether the population is or not. b. The sample means tend to form a normal distribution only if the population distribution is normal. The sample meanns tend to be distributed evely across the scale, forming a rectangular- shaped distribution. c. d. There are thousands of possible samples and it is impossible to predict the shape of the distribution.
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