The former manager of the coffee shop in a local bookstore claimed that the mean daily sales were $3,250. Heather Davis is hired as the new department manager, and she suspects that the former manager’s claim is high. Having taken a statistics course, Heather randomly selects 11 days and finds that the average sales for those days was $2,956.14 with a sample standard deviation of $370. Assuming the sales data are normally distributed, test the hypothesis that the mean daily sales is lower than $3,250. Use α = 0.01.

The former manager of the coffee shop in a local bookstore claimed that the mean daily sales were $3,250. Heather Davis is hired as the new department manager, and she suspects that the former manager’s claim is high. Having taken a statistics course, Heather randomly selects 11 days and finds that the average sales for those days was $2,956.14 with a sample standard deviation of $370. Assuming the sales data are normally distributed, test the hypothesis that the mean daily sales is lower than $3,250. Use α = 0.01.

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

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.4: Distributions Of Data

Problem 19PFA

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Question

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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