The manager of a department store is thinking about establishing a new billing system for the store's credit customers. She determines that the new system will be cost-effective only if the mean monthly account is more than $175. A random sample of 400 monthly accounts is drawn, for which the sample mean is $178. The manager knows that the accounts are approximately normally distributed with a standard deviation of $65. Calculate the test statistics. roughly 2.46 roughly 0.92 roughly 1.12 roughly 1.98

Given that Sample size n=400 Sample mean=178 Standard deviation =65

Answered: The manager of a department store is…

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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The manager of a department store is thinking about establishing a new billing system for the store's credit customers.

She determines that the new system will be cost-effective only if the mean monthly account is more than $175. A random sample of 400 monthly accounts is drawn, for which the sample mean is $178.

The manager knows that the accounts are approximately normally distributed with a standard deviation of $65.

Calculate the test statistics.

roughly 2.46

roughly 0.92

roughly 1.12

roughly 1.98

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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