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Homework answers / question archive / 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   A robust estimator is one that is unbiased and symmetrical about zero

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   A robust estimator is one that is unbiased and symmetrical about zero

Statistics

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

 

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

 

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

 

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

 

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

 

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

 

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

 

  1. 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? ,

 

  1. 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

 

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

 

 

  1. In developing an interval estimate for a population mean, a sample of 50 observations was used. The interval estimate was 19.76 +- 1.32. Had the sample size been 200 instead of 50, the interval estimate would have been

 

  1. A sample variance of s^2 is an unbiased estimator at the population variance when the denominator of s^2 is                                                               .

 

 

  1. In the sample proportion, represented by p=x/n, the variable x refers to                   . Sample size

 

  1. An unbiased estimator is

 

  1. Thirty-six months were randomly sampled and the discount rate on new issues of 91- day Treasury Bills was collected. The sample mean is 4.76% and the standard deviation is

171.21. What is the unbiased estimate for the mean of the population?

 

  1. A 98% confidence interval estimate for a population mean is determined to be 75.38 to 86.52. If the confidence level is reduced to 90%, the confidence interval for population mean

 

  1. Suppose the population of blue whales is 8,000. Researchers are able to garnish a sample of oceanic movements from 100 blue whales from within this population. Thus,

 

 

  1. In the sample proportion, represented by p = x / n, the variable x refers to

 

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