True or false?  In contrast to the population mean, μ, which can never be known unless all members of the population are known, the population standard deviation, σ, can be exactly determined from a sample.TrueFalse

Which of the following statements about populations and samples is FALSE?The spread in data set A is greater than that in data set B. Data set A likely has a higher variance than that of data set B.Sample standard deviation is the square root of sample variance.Population variance and mean are estimators for the sample variance and mean.Sample variance and mean are estimators for the population mean and variance.

Which one of the following is incorrect?*Standard deviation of a sample is a statistic.Variance of population is a parameter.Mean of a sample is a parameter.Standard deviation of a population is a parameter.

If many samples are taken from the same population, their means will be different.Question 7Select one:TrueFalse

The standard deviation is computed by dividing the sum of the squared deviations by the number of observations. A. TRUE B. FALSE C. I don't know

When is the z-statistic used to estimate the population mean?a.When the population standard deviation is knownb.When the population standard deviation is unknownc.When the sample size is smalld.When the sample size is large