Application of sample mean probability 5.27

pling distribution of $ is approximately normal. Why? performed a memory task as a distraction. The researchers c. Find the probability that the sample mean time until found that students who are video game players took an the first critical-part failure exceeds .13 hour. average of 3.1 seconds to cross the street, with a standard 5.27 Tomato as a taste modifier. Miraculin is a protein naturally deviation of & second. Assume that the time. x to cross produced in a rare tropical fruit that can convert a sour the street for the population of video game players has taste into a sweet taste. Refer to the Plant Science (May a = 5.1 and of = &. Now consider a sample of 30 students 2010) investigation of the ability of a hybrid tomato plant and let & represent the sample mean time (in seconds) to to produce miraculin, Exercise 4.99 (p. 263). Recall that the cross the street in the simulator. amount x of miraculin produced in the plant had a mean of a. Find P(x > 5.5 ). 105.3 micrograms per gram of fresh weight with a standard b. The 30 students in the sample are all non-video game deviation of 8.0. Consider a random sample of n = 64 players. What inference can you make about a andfor o hybrid tomato plants and let & represent the sample mean for the population of non-video game players? Explain. amount of miraculin produced. Would you expect to ob- 5.31 Exposure to a chemical in Teflon-coated cookware. serve a value of & less than 103 micrograms per gram of Perfluorooctanoic acid (PFOA) is a chemical used in Teflon- fresh weight? Explain. coated cookware to prevent food from sticking. The EPA is investigating the potential risk of PFOA as a cancer causing Applying the Concepts-Intermediate agent (Science News Online, August 27 2005). It is known that the blood concentration of PFOA in people in the con