Liberty University Online Academy

BMAL 590

Section 6: Inference About a Population

1)The standard deviation of x?₁ - x?₂ is also called the

2. A robust estimator is one that is unbiased and symmetrical about zero.
3. 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

4. The degrees of freedom for the test statistic for μ when σ is unknown is

5. The statistic (n - 1)s² / σ² has a chi-squared distribution with n - 1 degrees of freedom if

6. Which of the following is an example illustrating the use of variance?

7. Which of the following conditions is needed regarding the chi-squared test statistic for the test of variance?

8. Under what condition(s) does the test statistic for p have an approximate normal distribution?

9. In selecting the sample size to estimate the population proportion p, if we have no knowledge of even the approximate values of the sample proportion p? ,

10. When determining the sample size needed for a proportion for a given level of confidence and sampling error, the closer to 0.50 that p is estimated to be

11. Which of the following would be an appropriate null hypothesis?