Hand out chapter 9

Hand out chapter 9 - Handout chapter 9 1. Five experts have...

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Handout chapter 9 1. Five experts have tested two brands of coffee; Brand A and Brand B. They have given a rating of 0-100. The table below shows the ratings. The manager of coffee shop believes Brand A tastes better than Brand B. Brand A Brand B C. J 70 60 A. N 85 85 J. M 95 90 O. J 80 60 P. V 78 78 a) At the 0.025, level of significance, is there evidence that Brand A has a better taste than Brand B? b) Find a 95% confidence interval for the true difference in mean ratings of the two brands. 2. A new brand of battery for use in calculators and cameras is said to last significantly longer than another brand. A camera manufacturer is to test this brand ( Y ) with brand ( X ) to see if brand Y has a longer life. If brand Y does last longer, the camera manufacturer will equip their new cameras with them. If not, they will equip them with brand X that is less costly. Twenty cameras are equipped as follows: nine with brand Y batteries and eleven with brand X batteries and the life of the batteries measured. Sample data are:
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This note was uploaded on 01/11/2012 for the course STATS 1305 taught by Professor Shahmai during the Spring '11 term at NYU.

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Hand out chapter 9 - Handout chapter 9 1. Five experts have...

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