Question
A confidence interval for a population mean has a margin of error of 3.1.
a)Determine the length of the confidence interval.
b)If the sample mean is 56.7, obtain the confidence interval.
a)Determine the length of the confidence interval.
b)If the sample mean is 56.7, obtain the confidence interval.
Answers
a)
± 3.1
b)
56.7 - 3.1 = 53.6
56.7 + 3.1 = 59.8
Interval is 53.6 to 59.8
± 3.1
b)
56.7 - 3.1 = 53.6
56.7 + 3.1 = 59.8
Interval is 53.6 to 59.8
the population of 1500 construction truck has load distributed normally with the mean of 6 tons and the standard deviation of 1 ton. Find the probability that its load is greater than 7?
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