Mr. Sawyer drove his car from his home to New York at the rate of 45 mph and returned over the same road at the rate of 40 mph.
1 answer:
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Answer is C. This is because in quadrant 2, so
is also true.
Answer:
Step-by-step explanation:
The confidence interval for the population mean x can be calculated as:
Where x' is the sample mean, s is the population standard deviation, n is the sample size and is the z-score that let a proportion of
on the right tail.
is calculated as: 100%-99%=1%
So,
Finally, replacing the values of x' by 308, s by 17, n by 15 and by 2.576, we get that the confidence interval is: