For Statistical Inference About the Mean of a Single Population

question 25

Multiple Choice

For statistical inference about the mean of a single population when the population standard deviation is unknown,the degrees for freedom for the t-distribution equal n − 1 because we lose one degree of freedom by using the:

• A)sample mean as an estimate of the population mean.
• B)sample standard deviation as an estimate of the population standard deviation.
• C)sample proportion as an estimate of the population proportion.
• D)sample size as an estimate of the population size.