Answered: uppose the retirement age in the U.S.…

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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uppose the retirement age in the U.S. is normally distributed with an unknown population mean and standard deviation. A random sample of 22 retirees is taken and results in a sample mean of 59 years old and sample standard deviation of 5 years.

df...1819202122t0.10…1.3301.3281.3251.3231.321t0.05…1.7341.7291.7251.7211.717t0.025…2.1012.0932.0862.0802.074t0.01…2.5522.5392.5282.5182.508t0.005…2.8782.8612.8452.8312.819

Find the margin of error for a 95% confidence interval estimate for the population mean using the Student's t-distribution. Use the portion of the table above.

Round the final answer to two decimal places.

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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