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7. Illowsky et al,pg 456; #112.
In a recent sample of 84 used car sales costs, the sample mean was $6,425 with a standard deviation of $3,156. Assume the underlying distribution is approximately normal.
a. Which distribution should you use for this problem? Explain your choice.
b. Define the random variable X-- in words.
c. Construct a 95% confidence interval for the population mean cost of a used car.
i. State the confidence interval.
ii. Sketch the graph.
iii. Calculate the error bound.
d. Explain what a "95% confidence interval" means for this study.
Develop an ordered array and plot a percentage histogram, what conclusions can you reach about the differences in the state cigarette tax between the states?
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There are 10 keys and only one of them can open a lock. We do not know which key can open the lock, but we will try them one by one until we find the right key. We record the keys which we have already tried. a. What's the probability of finding th..
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