People tend to be more generous after receiving good news. Are they less generous after receiving bad news? The average tip left by adult Americans is 19%.19%. Say that a server gives 2020 patrons of a restaurant a message on their bill warning them that tomorrow's weather will be bad and record the percentage tip they leave.The tips as a percentage of the total bill are given in the table.Tips (percentage)18.019.119.218.818.419.018.516.116.818.2114.017.0113.6117.520.020.218.818.023.219.4Suppose that percentage tips are Normal with ?=1.8.with . Information about the NAEP test can be found online at https://www.nationsreportcard.gov. SOLVE: We have a random sample of ?=20 customers and were told to assume tips have a Normal distribution.Find ?⎯⎯⎯. Give your answer to two decimal places.?⎯⎯⎯=�¯= %Find the ?� statistic. Give your answer to two decimal places.?= Using the software of your choice or Table A, find the ?-value.�-value. Give your answer to four decimal places.?-value:

The observed tips as a percentage of total bill are given as: It is given that, for the…

Answered: People tend to be more generous after…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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People tend to be more generous after receiving good news. Are they less generous after receiving bad news? The average tip left by adult Americans is 19%.19%. Say that a server gives 2020 patrons of a restaurant a message on their bill warning them that tomorrow's weather will be bad and record the percentage tip they leave.

The tips as a percentage of the total bill are given in the table.

Tips (percentage)
18.0	19.1	19.2	18.8	18.4	19.0	18.5	16.1	16.8	18.21
14.0	17.01	13.61	17.5	20.0	20.2	18.8	18.0	23.2	19.4

Suppose that percentage tips are Normal with ?=1.8.with .

Information about the NAEP test can be found online at https://www.nationsreportcard.gov.

SOLVE: We have a random sample of ?=20 customers and were told to assume tips have a Normal distribution.

Find ?⎯⎯⎯. Give your answer to two decimal places.

?⎯⎯⎯=�¯=

Find the ?� statistic. Give your answer to two decimal places.

Using the software of your choice or Table A, find the ?-value.�-value. Give your answer to four decimal places.

?-value:

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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