Answered: populations are normally distributed.…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

Independent simple random samples are taken to conduct a simple comparative test of the means of two populations. The sample sizes are n1 = 20 and n2 = 30. It is assumed that the variances of the populations are equal and that the populations are normally distributed.

Which is the appropriate statistical test?

a. pooled variance t test

b.paired t test

c. separate variance t test

d. independent samples z test

Which of the following must be used?

a. z distribution

b. t distribution with how many degrees of freedom?

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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