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expresslmnop
30.03.2020 •
Mathematics
A transportation worker takes a simple random sample of 162 toll booth receipts for one day and finds that the mean is $7.38 with a standard deviation of $1.45. What is the 99% confidence interval for the mean amount of all the receipts that day?
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Ответ:
99% Confidence interval: (7.09,7.67)
Step-by-step explanation:
We are given the following in the question:
Sample mean,
= $7.38
Sample size, n = 162
Alpha, α = 0.05
Sample standard deviation, σ = $1.45
99% Confidence interval:
Putting the values, we get,
Degree of freedom = n - 1 = 161
is the required 99% confidence interval for the mean amount of all the receipts that day.
Ответ:
a=20 because the rate of change is -3 is the right answer
Step-by-step explanation: