Using the simple random sample of weights of women from a data set, we obtain these
sample statistics: n=40 and x overbar=145.02 lb. Research from other sources suggests
that the population of weights of women has a standard deviation given by σ=30.08 lb.
Find the best point estimate of the mean weight of all women.
b. Find a 95% confidence interval estimate of the mean weight of all women.
Salaries of 34 college graduates who took a statistics course in college have a mean, x
overbar x, of $67,300. Assuming a standard deviation, σ, of $16 comma 03016,030,
construct a 95% confidence interval for estimating the population mean μ.
Which of the following would be a correct interpretation of a 99% confidence interval
such as 4.1 less than<μ<5.6?
Do one of the following, as appropriate. (a) Find the critical value z Subscript alpha
divided by zα/2, (b) find the critical value t Subscript alpha divided by 2tα/2, (c) state that
neither the normal nor the t distribution applies.
95%; n=200200; σ=19.0; population appears to be skewed