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The Healthy Drinks store stated that the average consumption of water per day was at least 100 gallons. To test the hypothesis that this figure may no longer be true, a researcher randomly selected 150 people and found that they used on average 105 gallons per day and s=10 gallons.
a) At α = .01, is there enough evidence to say that their statement might no longer be correct?
b) What are the lower-limit and the upper-limit of the 90% two-sided confidence interval?
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At the 0.10 level of significance, does the location in the store have an effect on the product's mean sales?
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What descriptive summary measures would you use to present the data. which measure is the best to use and which is the worse and why?
Calculate Mean of a Probability Distribution
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30% of the college of business students major in finance. A random sample of 20 students is selected. What is the probability that no more than 3 students of the selected students are majoring in finance?
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