Exam 7: Statistical Inference

Identify the power of the test from the following probabilities.

For a two-sample test for means with the population variance being known, the Excel procedure used is the Excel z-test.

What is the confidence coefficient when the level of significance is 0.03?

Which of the following is true about chi-square distribution?

Explain how to draw a conclusion for one- and two-tailed hypothesis tests. LO2: Compare and contrast the major types of hypothesis testing for one-sample tests -Which of the following is true about one-tailed and two-tailed tests?

Which of the following is true about determining the proper form of the hypotheses?

A manufacturer wishes to determine if the average profit from the sale of his product exceeds $6,710. Which of the following is the appropriate hypothesis test?

State the proper forms of hypotheses for two-sample hypothesis tests. -For a lower-tail test, the p-value in the output from an Excel tool:

If the alternative hypothesis includes the symbol <, the rejection region is in the upper tail.

In a two-sample test for differences in means, the hypotheses are of the form:

Level of significance is the probability of:

Which of the following is a valid one-sample hypothesis test?

Which of the following probabilities gives the confidence coefficient?

Use the data given below to answer the following question(s). The following extract from a manufacturer's database shows a sample of 10 suppliers, their transportation charges, and the estimated and actual total costs of supplying materials. (Note: Assume a significance level of 0.05 wherever necessary.) Supp lier Transportation Charges Estimated Total Cost Actual Total Cost Peter 340 4,500 4,680 John 560 4,500 4,790 Martin 480 4,500 5,110 Philip 290 4,500 4,780 Mark 370 4,500 4,810 Thomas 520 4,500 4,770 Jaison 350 4,500 5,250 David 430 4,500 4,930 Carter 510 4,500 5,010 Leonard 270 4,500 4,810 -Conduct the appropriate type of one-sample test-statistic to determine whether the average transportation charge is less than $430. Apply a decision rule using the observed level of significance and draw a conclusion.

Use the data given below to answer the following question(s). In a lower one-tailed hypothesis test, chosen level of significance = 0.10, sample size = 55, and t- test statistic = -1.76. -Which of the following is the conclusion?

The confidence coefficient is denoted by:

Use the data given below to answer the following question(s). The following extract from a manufacturer's database shows a sample of 10 suppliers, their transportation charges, and the estimated and actual total costs of supplying materials. (Note: Assume a significance level of 0.05 wherever necessary.) Supp lier Transportation Charges Estimated Total Cost Actual Total Cost Peter 340 4,500 4,680 John 560 4,500 4,790 Martin 480 4,500 5,110 Philip 290 4,500 4,780 Mark 370 4,500 4,810 Thomas 520 4,500 4,770 Jaison 350 4,500 5,250 David 430 4,500 4,930 Carter 510 4,500 5,010 Leonard 270 4,500 4,810 -Conduct the appropriate type of one-sample test-statistic to determine whether the average transportation charge is less than $430.