22. A researcher reports an F-ratio with df = 3/36 for an independent-measures experiment. How many treatment conditions were compared in this experiment? а. 3 b. 36 C. 39 d. 4
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- Naini, Cobourne, McDonald and Donaldson (2008) reported that a specific ratio of height to face length of 1 to 8.5 tended to be rated as most attractive—almost exactly what Da Vinci’s idealized Vitruvian Man, predicts as “perfection” in the human form. For this study, we want to see if there is a relationship between a person’s height and head circumference. We get a random sample of 40 people and measure both their height and their head size to the nearest centimeter. What test should you use and why?It is thought that a new process for producing a certain chemical may be cheaper than the currently used process. Each process was run 6 times, and the cost of producing 100 L of the chemical was determined each time. The results, in dollars, were as follows: New Process: 51 52 55 53 54 53 Old Process: 50 54 59 56 50 58 Can you conclude that the mean cost of the new method is less than that of the old method?Suppose that 25% of patients with MI in 2000 died within24 hours. This proportion is called the 24-hour case-fatalityrate. 7.14 Of the 15 new MI cases in the preceding study,5 died within 24 hours. Test whether the 24-hour casefatality rate changed from 2000 to 2010
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- In response to concerns about the nutritional contents of fast foods, McDonald’s announced that it would use new cooking oil for its french fries that would decrease substantially trans fatty acid levels and increase the amount of more beneficial poly-unsaturated fat. The company claimed that 97 out of 100 people cannot detect a difference in taste between the new and old oils. Assuming that this figure is correct (as a long-run proportion). Let X denote the number of individuals who can taste the difference between the two oils in a random sample of 1000 individuals who have purchased fries at McDonald’s. Use the normal approximation with continuity correction to find the probability that at most 5% can taste the difference between the two oils.A researcher reports an F-ratio with df between = 2 and dfwithin = 30 for an independent-measures ANOVA. a. How many treatment conditions were compared in the experiment?b. How many subjects participated in the experiment?You are in charge of assessing two different Malaria vaccines, to determine if one should be preferred over the other. Overall, you know that the base rate of infection for Malaria in these populations is 20%, or p=0.2. For the first (Vaccine A), a trial of 1200 people observed that 80 came down with Malaria after having been vaccinated. For the second (Vaccine B), in a trial of 1600 people, 84 people came down with the disease. So, using statistical arguments, make the case for what appropriate policy should be. Answer the following questions:1) is their strong evidence that both vaccines work? 2) should one vaccine be favored over the other? Why or why not?