Answered: When do we use z-distribution? A.) when…

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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When do we use z-distribution? A.) when the standard deviation is unknown. B.) when the population is normal and its standard deviation is known. C.) when the sample size is less than 30 and and the sample standard deviation is known. D.) when the sample size is less than 30. What is the difference between the t-distribution and the standard normal distribution? A.) The t-distribution has greater area in the tails compared to the normal distribution. B.) the standard normal distribution is bell-shaped while the t-distribution is not. C.) the standard normal distribution is symmetric while the t-distribution is skewed. D.) none because they are the same thing. Please answer all. Thank you.

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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