6 7 110% + 25. Which of the following is an example of a matched pairs design? a. A teacher compares the pre-test and post-test scores of students. b. A teacher compares the scores of students using a computer- based method of instruction, with the scores of other students using a traditional method of instruction. c. A teacher compares the scores of students in her class on a standardized test with the national average score. 6 d. A teacher calculates the average of scores of students on a pair of tests and wishes to see if this average is larger than 80%.Las tecnologias que 2/7 90% + 7. Twenty-five seniors from a large metropolitan area school district volunteer to allow their Math SAT test scores to be used in a study. These 25 seniors had a mean Math SAT score of x = 450. Suppose we know that the standard deviation of the population of Math SAT scores for seniors in the district is o = 100. Assuming the population of Math SAT scores for seniors in the district is approximately normally distributed, a 90% confidence interval for the mean Math SAT score / for the population of seniors computed from these data is a. 450 + 32.9. b. 450 + 39.2. c. 450 + 164.5. d. not trustworthy. 2 8. In formulating hypotheses for a statistical test of significance, the null hypothesis is often a. a statement of "no effect" or "no difference." b. the probability of observing the data you actually obtained. c. a statement that the data are all ( d. 0.055 /7 110% 17. The time needed for college students to complete a certain paper and pencil maze follows a normal distribution with a mean of 70 seconds and a standard deviation of 15 seconds. You wish to see if the mean time u is changed by meditation, so you have a group of nine college students meditate for 30 minutes and then complete the maze. It takes them an average of * = 64 seconds to complete the maze. Use this information to test the hypotheses Ho: M = 70, Hai u # 70 at significance level a = 0.01. You conclude a. that Ho should be rejected. b. that Ho should not be rejected. c. that Ha should be accepte d. this is a borderline case and no decision should be made.X + V blackboardcdn.com/60952172d527a/2121339?X-Blackboard-Expiration=1666850400000&X-Blackboard... @ 2 x que.. 3 17 110% 10. The mean area u of the several thousand apartments in a new development by a certain builder is advertised to be 1250 square feet. A tenant group thinks this may be different, because it is based on the square footage of apartments in an older development by the same builder. The group hires an engineer to measure a sample of apartments to verify its suspicion. The appropriate null and alternative hypotheses, Ho and Ha, for u are a. Ho: 4- 1250 and Hatu # 1250. b. Ho: = 1250 and Ha: 4 - 1250. c. Ho: # = 1250 and Ha: (> 1250 d. cannot be specified without knowing the size of the sample used by the engineer