Question
A random sample of state gasoline taxes in cents is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does you interval contain the national average of 44.7 cents?
38.4 40.9 67 32.5 51.5 43.4
38 43.4 50.7 35.4 39.3 41.4
38.4 40.9 67 32.5 51.5 43.4
38 43.4 50.7 35.4 39.3 41.4
Answers
MathGuru
Formula:
CI90 = mean + or - 1.645(sd/√n)
You will need to calculate mean and standard deviation from the data given. Sample size (n) = 12.
Plug values into the formula and compute the confidence interval.
I'll let you take it from here.
CI90 = mean + or - 1.645(sd/√n)
You will need to calculate mean and standard deviation from the data given. Sample size (n) = 12.
Plug values into the formula and compute the confidence interval.
I'll let you take it from here.
Anonymous
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mike
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Anonymous
12