A random sample of 81 trucks manufactured by the gecko


A random sample of 81 trucks manufactured by the Gecko Company results in the following: sample mean = 9.80 years; sample standard deviation = 1.80 years. Suppose you want to construct a 90% CIE for the population mean μ, what's the Z-value that you need to use?

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Basic Statistics: A random sample of 81 trucks manufactured by the gecko
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