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A Rollercoaster s auditors estimate that the average daily loss from those illegally riding without tickets is never more than $200, but wants to determine the accuracy of this statistic. The company researcher takes a random sample of losses over 49 days and finds that = $187 and s = $30....
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The mall carousel has a set of data with rider's age (X) and the corresponding number of on-the-ride-accidents. Analysis on the set finds that the regression equation is Y=175-4.9X. a. What can be said of the correspondence between age and accidents? b. Are older riders safer or...
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You are the shipping manager at the Postham Company. You are interested in the percentage of packages delivered damaged. A simple random sample of 500 packages yields 16 delivered damaged and 484 delivered undamaged. How many packages should be sampled in order to be 90% confident of being...
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A confidence interval of 90% was used to estimate the proportion of customers who buy at least two items during their shopping mall experience. A random sample of 200 customers produced the following confidence interval: 35% +/- 7%. What is the best way to explain these results?
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Suppose an Insurance company reports that approximately 85% of all automobile damage liability claims were made by people less than 25 years of age. A random sample of six automobile insurance liability claims is under study. Make a histogram showing the probability that r = 0 to 6 claims are...
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One of the stores is a proud sponsor of the college soccer team. They constantly try to raise money for the team and they want to determine if there is any type of relationship between the amount of contribution and the years that the alumnus has been out of school. Years (X) 1 5 3 10 7 6 2...
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can you help me with question 3 and 4 on my assignment?
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can you help me finish my assignment?
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4. The makers of a soft drink want to identify the average age of its consumers. A sample of 16 consumers is taken. The average age in the sample was 22.5 years with a standard deviation of 5 years. a. Construct a 95% confidence interval for the true average age of the consumers. b....
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1.8. Suppose that we selected 12 outstanding accounts and measured the time that was required to convert each into cash after the first billing. The results in days are as follows: 120, 50, 40, 180, 230, 250, 30, 60, 70, 180, 270, 190 Use these data to construct a 98% confidence interval...
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- 1. A school administrator wonders if students whose first language is not English score differently on the math portion of the sat exam than students whose first language is English. The mean SAT math score of students whose first language is english is 516 on the basis of data obtained from the college board. A simple random sample of 20 students whose first language is not English result in a sample mean SAT math score of 522. SAT math score are normally distributed with a population standard deviation of 114. Why is it necessary for SAT math scores to be normally distributed to test the hypothesis?
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