Now, instead, assume you’ve bought all the buses from a single dealership that maintains that these type of  buses  have an average maintenance cost of $440 per year. Test whether your sample of 80 buses cost significantly more than that at the 5% significance level. what type of test is this? Group of answer choices t; one tail z; one tail t; two tail z; two tail

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Now, instead, assume you’ve bought all the buses from a single dealership that maintains that these type of  buses  have an average maintenance cost of $440 per year. Test whether your sample of 80 buses cost significantly more than that at the 5% significance level.

what type of test is this?

Group of answer choices
t; one tail
z; one tail
t; two tail
z; two tail
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