Answered: a. Complete the ANOVA Table (fill in…

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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a. Complete the ANOVA Table (fill in the question marks)
b. Do the five supermarkets have different average prices? Test at the 5% significance level.
c. Calculate the 95% CIs for the difference in average prices between supermarkets A and B, and between supermarkets A and C. Construct the intervals so that we are 95% confident that both CIs are correct. Use Bonferroni adjustment.

Transcribed Image Text:2. In a comparison of prices of items at five supermarkets, A, B, C, D, and E, six items were randomly selected for comparison. The objective of the study is to see whether there is a difference in the mean prices among the five supermarkets. The prices of items in each supermarket were recorded; actual prices are not shown but are indicated with X's in the accompanying below. |ABCDE X X X X X X X X X X Mushroom soup, band X X x X X X X x x x x Spaghetti sauce, brand X X X x X X |X X X X X Celery 1 Ib. Toothpaste brand X Yogurt, brand X Ketchup, brand X Partial results of software data analysis are shown below. Analysis of Variance for Price Source Market Count Mean Sum of Squares Df Mean Square F-Ratio P-Value 6 |0.950727 6 0.995464 6 1.06 MAIN EFFECTS A:Supermarket B:Food RESIDUAL TOTAL (CORRECTED) E ? ? D 3.83962 ? 6 1.075 0.107081 ? ? C 1.155 4.24937 ? co B.

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