Which of the following studies uses a matched-subjects design? A)None of the other options is a matched-subjects design. 
 B)A sample of children is tested for vocabulary skills at age six and then again at age ten. 
 C)A group of twins is tested for visual acuity on one day and then tested again the following day after receiving a drug. 
 D)Participants are assigned to one of two treatment groups so that each participant in one group has very similar education as a participant in the other group.

You may need to use the appropriate appendix table or technology to answer this question. A national standardized test consists of three parts: critical reading, mathematics, and writing. Suppose each part of the test is scored on a 200- to 800-point scale with a median of approximately 510. Scores for each part of the test can be assumed to be symmetric. Use the following data to test the hypothesis that the population median score for the students taking the writing portion of the test is 510. 635 701 439 447 464 502 405 453 471 476 447 590 337 387 514 State the null and alternative hypotheses. O Ho: Median # 510 H₂: Median = 510 O Ho: Median 2 510 H₂: Median 510 ✓ Find the value of the test statistic. T = Find the p-value. (Round your answer to four decimal places.) p-value = Using a = 0.05, what is your conclusion? O Reject Ho. There is sufficient evidence to conclude that the population median writing test score is not 510. Ⓒ Do not reject Ho. There is not sufficient evidence to…

A warehouse manager wants to know if there is an association between the shift worked and being on time for work. To investigate, he selects a random sample of 70 workers and classifies each one according to the shift they worked most recently and whether they were on time for work. He was unable to classify a substantial number of people as being on time, so he classified those individuals as unknown. The data are displayed in the table.   The manager would like to know if these data provide convincing evidence of an association between the shift worked and being on time in the large population of all workers at this warehouse. The random and 10% conditions are met. Is the Large Counts condition met? Yes, the smallest expected count is 5, so all expected counts are at least 5. Yes, the smallest expected count is 8.54, so all expected counts are at least 5. No, the smallest expected count is 2.56, so the expected counts are not all at least 5. No, the smallest expected count is…

Section 11.2 Question #4 The table below includes results from polygraph​ (lie detector) experiments conducted by researchers. In each​ case, it was known if the subjected lied or did not​ lie, so the table indicates when the polygraph test was correct. Use a 0.05 significance level to test the claim that whether a subject lies is independent of the polygraph test indication. Do the results suggest that polygraphs are effective in distinguishing between truth and​ lies?   View the table   Did the Subject Actually​ Lie?     No​ (Did Not​ Lie) Yes​ (Lied)   Polygraph test indicated that the subject lied. 9 48     Polygraph test indicated that the subject did not lie. 30 12       Determine the test statistic.   χ2= _________ (Round to three decimal places as​ needed.)   Determine the​ P-value of the test statistic.   ​P-value= ___________ (Round to four decimal places as​ needed.)