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An advertisement for Jewel, a supermarket chain in Chicago, claims that Jewel has had consistently lower prices than Dominic. As part of a survey conducted by an "independent market basket pricechecking company", the average weekly total, based on the prices of approximately 95 items, is given for two different supermarket chains recorded during 4 consecutive weeks in a particular month.
Week Jewel Dominic1 264.40 266.172 250.76 265.793 242.04 265.264 244.27 271.32
Is there a significant difference in the average prices for these two different supermarket chains? Test at α = 0.05
Identify the sampling distribution to be used: the standard normal distribution or the Student's t distribution. Find the critical value(s).
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Find a 99% confidence interval for the mean pH in rainfall and interpret the interval and what assumption must be made for the confidence interval to be valid?
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