Need clear and simple solutions to help me to study for stats test. Document Preview: ECMT1010 Workshop 8 Problems 1. (Chapter 9, problem 9.2) Use the data given to test the following hypotheses. Assume the data are normally distributed in the population. 2. (Chapter 9, problem 9.6) According to a study several years ago, the average BMW driver earns $82 600 per year. Suppose a researcher believes that the average annual earnings of a BMW driver are lower now, and he sets up a study in an attempt to prove his theory. He randomly samples 18 BMW drivers and finds out that the average annual salary for this sample is $78 974, with a population standard deviation of $7810. Use a = .01 to test the researchers theory. Assume annual salaries are normally distributed. 3. (Chapter 9, problem 9.10) A random sample of size 20 is taken, resulting in a sample mean of 16.45 and a sample standard deviation of 3.59. Assume x is normally distributed and use this information and a = .05 to test the following hypotheses. 4. (Chapter 9, problem 9.16) Suppose that in past years the average price per square metre for warehouses has been $322.80. A national real estate investor wants to determine whether that figure has changed now. The investor hires a researcher who randomly samples 19 warehouses that are for sale and finds that the mean price per square metre is $316.70, with a standard deviation of $12.90. If the researcher uses a 5% level of significance, what statistical conclusion can be reached? What are the hypotheses? 5. (Chapter 9, problem 9.20) Suppose you are testing H0: p = .29 versus Ha: p ? .29. A random sample of 740 items shows that 207 have this characteristic. With a .05 probability of committing a Type I error, test the hypothesis. For the p-value method, what is the probability of the calculated z value for this problem? If you had used the critical value method, what would the two critical values be? How do the sample results compare with the critical values? 6. (Chapter 9, problem 9.24) Eighteen per cent of multinational companies provide an Attachments: Workshop-8.pdf