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Name: The number of cars sold annually by used car salespeople is normally d
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Description: The number of cars sold annually by used car salespeople is normally distributed with a standard deviation of 16. A random sample of 320 salespeople was taken and the mean number of cars sold annually was found to be 65. Find the 96% confidence inter

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

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.3: Measures Of Spread

Problem 11PPS

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The number of cars sold annually by used car salespeople is normally distributed with a standard deviation of 16. A random sample of 320 salespeople was taken and the mean number of cars sold annually was found to be 65. Find the 96% confidence interval estimate of the population mean.

Note: For each confidence interval, enter your answer in the form (LCL, UCL). You must include the parentheses and the comma between the confidence limits.

Confidence Interval =

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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