a)
± 3.1
b)
56.7 - 3.1 = 53.6
56.7 + 3.1 = 59.8
Interval is 53.6 to 59.8
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.
2 answers
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?
2 answers