In determining an interval estimate of a population mean when σ is unknown, we use a t distribution with n - 1 degrees of freedom.
举一反三
- In order to use the normal distribution for interval estimation of m when s is known, the population A: must be very large B: must have a normal distribution C: can have any distribution D: must have a mean of at least 1
- In order to construct a confidence interval estimate of the population mean, the value of the population mean is needed.
- So-called “95% confidence interval for population mean” is applied to estimate the location of population mean, with a confidence level 95%.
- The degrees of freedom in the calculation of the population variance is n -- 1.
- The larger the level of confidence used in constructing a confidence interval estimate of the population mean, the narrower the confidence interval.