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Author Question: We are interested in comparing the average supermarket prices of two leading colas. Our sample was ... (Read 128 times)

c0205847

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We are interested in comparing the average supermarket prices of two leading colas. Our sample was taken by randomly selecting eight supermarkets and recording the price of a six-pack of each brand of cola at each supermarket. The data are shown in the following table:

Price


If the problem above represented a paired difference, what assumptions are needed for a confidence interval for the mean difference to be valid?
◦ The population variances are equal.
◦ The population of paired differences has an approximately normal distribution.
◦ The samples were independently selected from each population.
◦ All of the above are needed.


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Marked as best answer by c0205847 on Feb 14, 2020

xthemafja

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c0205847

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Reply 2 on: Feb 14, 2020
Excellent


abro1885

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Reply 3 on: Yesterday
:D TYSM

 

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