Answered: A random sample is selected from a…

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

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.4: Distributions Of Data

Problem 19PFA

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Question

A random sample is selected from a normally distributed population. The following sample statistics are obtained: n = 20, sample mean=30, and s = 10. Based on this information, and using a 95% confidence level, which of the following is a valid calculation from the sample statistics?

Question 13 options:

	The critical value is 1.96.
	The critical value is 1.7921.
	The margin of error is approximately within 4.68.
	The standard deviation of the sampling distribution is 0.50.

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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