Question: We are interested in comparing the avg. supermarket prices of two leading colas in the Tampa area. Our sample was taken by randomly going to each of eight supermarkets and recording the price of s-pack of cola of each brand. The data are shown in the following table:

Price

Supermarket Brand 1 ($) Brand 2 ($) Difference

1 $2.25 $2.30 $-0.05

2 2.47 2.45 0.02

3 2.38 2.44 -0.06

4 2.27 2.29 -0.02

5 2.15 2.25 -0.10

6 2.25 2.25 0.00

7 2.36 2.42 -0.06

8 2.37 2.40 - 0.03

x ₁ = 2.3125 x ₂ = 2.3500 d = -0.0375

s ₁ = 0.1007 s ₂ = 0.0859 s _d = 0.0381

Find a 98% confidence interval for the difference in mean price of brand 1 and brand 2.

Price: $2.99

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Deliverable: Word Document