Statistics

Grade and Section: Parent's Signature: A. Multiple Choices: Choose the letter of the best answer to the given questions, Shade only the letter of the correct answer in the provided answer sheet at the back of this paper. 1. In a left-tailed test with a-0.01, the critical value of z is: B. -2.330 C. -1.960 D. -1.645 A. -2.576 2. Which of the following defines the area encompassed by the values not included in the non-rejection region or also the area of the tails of the distribution? A. critical value C. population variance B. level of significance D. rejection region 3, For a two-tailed test with variance unknown, n= 16, and a=0.05, what is the critical value? A +2.092 B. #2,134 C. 42,145 D. +2.145 4. If the level of significance decreased from 0. 1 to 0.05, then the boundaries for the critical region move farther away from the center of the distribution. A true C. both A and B B. false D. cannot be determined 5. Based on the graph, which of the following is TRUE? A. This is a two-tailed test. B. This is a right-tailed test. -1.725 C. Level of significance is 0.025. D. The rejection region is to-1.725. 6. What test statistic will be used if the sample size is below 30? A. population mean B. standard deviation C. t-test D. z-test 7. How many samples are best when dealing with t-test? A. cannot be determined C. smaller than 30 B. exactly 30 D. equal or larger than 30 8. When should you use the z-test? 1. When you are testing for a population mean II. When the population standard deviation is given III. When the sample standard deviation ONLY is given IV. When you are testing with small sample sizes, n 400 B. Ho: H = 400 and Haik