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The average cost of a gallon of unleaded gasoline in Greater Cincinnati was reported to be $2.41 (The Cincinnati Enquirer, February 3, 2006). During periods of rapidly changing prices, the newspaper samples service stations and prepares reports on gasoline prices frequently. Assume the standard de-viation is $.15 for the price of a gallon of unleaded regular gasoline, and recommend the appropriatesample size for the newspaper to use if they wish to report a margin of error at 95% con dence.
a. Suppose the desired margin of error is $.07.b. Suppose the desired margin of error is $.05.c. Suppose the desired margin of error is $.03.
Consider the sample data for plants A, B, C & D of the above company, which are tabulated in table 1. Test whether the four means are equal at the 5% level of significance. Perform
Lifts usually have signs indicating their maximum capacity. Consider a sign in a lift that reads “maximum capacity 1400kg or 20 persons”. Suppose that the weights of lift-users are
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a clinical psychologist claims that on average, at least twenty five clients visit her per week. for a random sample of 8 weeks, the following numbers of clients were recorded; 25
In an examination 600 candidates appeared, boys outnumbered girls by 16% of all candidates. number of passed candidates exceeded the number of failed candidates by 310. Boys failin
1. Mention the characteristics of Statistics. Explain any two applications of Statistics. 2. Distinguish between primary and secondary data. What are the methods of collecting prim
Managers are very interested in how a consumer makes choice among alternatives. In this exercise, we ask you to consider the price of gasoline you may purchase to operate
The National Center for Health Statistics recently released a report that stated 70% of adults do not exercise regularly. A researcher decided to test whether the results on a stat
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