Choose the best answer to the given questions or statement

10. . If the variance is unknown and the sample size is small, which test statistic is appropriate? A. t-test C. two-tailed test B. z-test D. one-tailed test . One-sample z~statistic is used instead of one-sample t-statistic when A. 1.1 is known. C. 1.1 is unknown. B. o is known. D. o is unknown . Based on the Central Limit Theorem, when the sample (n) is extremely large and the variance is known, what is the statistical test to be used? A. t-test C. two-tailed test B. ztest D. one-tailed test Which of the following characteristics can be considered in using 2- test/ statistic as an appropriate test? A. Sample standard deviation is known. B. Population is not normally distributed. C. The sample size is greater than 30. D. Population standard deviation is unknown. What test is appropriate if the distribution is not normal, there is a suiciently large sample size, and population variance is unknown? A. t-test C. null test B. ztest D. hypothesis test Which of the following notations is needed in identifying the test statistic to be used in computing test value? A. p B. d C. o D. x . In a sample n=100 selected from a normal population 92 = 56 and S = 12, what statistical test is applicable? A. t-test C. left-tailed test B. z-test D. two-tailed test The t-test for single sample mean may be used when all the following conditions are true except A. Sample size is less than 30. B. Sample standard deviation (5) is known. C. Population standard deviation (6) is known. D. Data are approximately normally distributed. . A simple random sample of 150 observations was taken from a large population. The sample average and the sample standard deviation were determined to be 70 and 16, respectively. What is the value of the s? A. 1.6 B. 16 C. 70 D. 150 A tire manufacturer tests the braking performance of one of its tire models on a test track. From long-term records, the company knows the value of o. The company tried the tires on 10 different cars, recording the stopping distance for each car on both wet and dry streets. Which test statistic is appropriate to use? A. t-test C. one-tailed test B. ztest D. hypothesis test 2 ll. 12. 13. 14. 15. "The average production of corn in the Philippines is 3,000 kgs. A new plan on food has been developed and is tested on 60 plots. The mean yield with the new plan on food is 3,200 kgs with standard deviation of 600 kgs. At a = 0.05 level of signicance, can you conclude that the production increased?\" What test statistic is to be used on the given problem? A. t-test C. left-tailed test B. z-test D. right-tailed test In the given situation below, identify the population standard deviation- \"In a recent survey, the average amount of money a college student gets is P200.00 with a standard deviation of P6200. A teacher feels that the average amount is higher. She surveys 80 randomly selected students and nds that the average amount is P245.\" A. a = 80 B. a = 1'62.00 C. a = P200110 D. a = 1245.00 An agent believes that the average closing cost of purchasing a new home is F328,250. She selects 40 new home sales at random and nds that the average closing cost is F333,300. The standard deviation of the population is F6360. What is the test statistic appropriate to used? A. t-test C. standard deviation B. ztest D. Central Limit Theorem What test static is appropriate to use in the given problem below? \"A random sample of 29 medical doctors showed that they work an average of 55 hours per week with a standard deviation of 7.5 hours per week. If the average is 48 hours per week, is this given evidence signicantly greater than the rest of the medical doctors?\" A. t-test C. variance B. z-test D. two-tailed test Last 2015, the government made a claim that the average income of the Filipino people was P18,000. However, a sample was taken recently showing an average income of P20,000 with a population standard deviation of f1,300. Which test statistic is appropriate to use? A. t-test C. one -tailed test B. z-test D. two-tailed test