Use the following information for problems 15 through 21. Thirty-two 1-Liter specimens of water were drawn from the wate
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Use the following information for problems 15 through 21. Thirty-two 1-Liter specimens of water were drawn from the water supply for a city and the concentration of lead in the specimen was measured. The average level of lead was 7.3 kg/Liter, and the standard deviation for the sample was 3.1 wg/Liter. Using a significance level of 0.05, do we have evidence the mean concentration of lead in the city's water supply is less than 10 we/Liter?
15. The t critical value is (fill in the blank). 16. If the true mean equals the null mean the probability the test statistic value will be less than the t critical value is (fill in the blank) 17. The test statistic value is (fill in the blank) 18. You reject the null hypothesis (a) Yes (b) No (c) it is not possible to know if the null hypothesis should be rejected. 19. Our test result cannot be (a) A correct decision (b) a Type I error (c) a Type Il error 20. Given below are some possible values for the true mean given in units of ws/Liter). Which value will give the largest probability of a Type II error? (a) 7.2 (b) 8.6 (c) 9.4 (d) 11.3 21. Given below are some possible values for the true mean (given in units of ws/Liter). Which value will give the smallest probability of a Type II error? (a) 7.2 (b) 8.6 (e) 9.4 (d) 11.