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, An interval estimate may or may not contain the true value of True
the parameter being estimated
The confidence level of an interval estimate of a parameter is True
the probability that the interval estimate will contain the
parameter.
The term Z ∝⁄2 ( σ/√n) describes maximum error of estimate
the formula for the confidence interval of the mean for a x̄ - z ∝⁄2 ( σ/√n)<μ<x̄ + z ∝⁄2 ( σ/√n)
specific ∝ is
What value of z ∝⁄2 is used in confidence interval shown 1.65
below (90%=μ)
A sample of 35 different payroll departments found that 235.4<μ<245.8
employees worked an average of 240.6 days a year. If the
population standard deviation is 18.8 days, find the 90%
confidence interval for the average number of days μ worked
by all employees who are paid through payroll departments
A student looked up the number of years served by 35 of the 11.4<μ<16.2
more than 100 supreme court justices. The average number of
years served by those 35 justices was 13.8. If the standard
deviation of the entire population is 7.3 year, find the 95%
confidence interval for the average number of years served
by all supreme court justices.