(06.05 MC) A food distributor conducts regular surveys of consumer spending on its products. The average weekly household spending (in dollars) on regular pasta and gluten-free pasta for each of 12 states was recorded. A scatterplot of spending on regular pasta versus gluten-free pasta is shown. Which of the following statements is true? (3 points)
Read Details(04.06 MC) The 200-meter race times at a state track meet are normally distributed with a mean of 13.56 seconds and a standard deviation of 2.24 seconds. Using the Standard Normal Probabilities table, what is the approximate probability that a runner chosen at random will have a 200-meter time less than 13.5 seconds? (5 points)
Read Details(05.01 LC) A polling company has decided to increase the size of its random sample of voters from about 2,000 people to about 4,500 people right before an election. A poll was designed to estimate the proportion of voters who favor a new law to set an 11 p.m. curfew for teenagers. What is the effect of this increase? (4 points)
Read Details(04.02 MC) A coin is weighted so that the probability of heads is 0.8. The coin is tossed 20 times, and the number of heads is recorded. This procedure is repeated 75 times with the number of heads being noted each time. What kind of distribution is simulated? (4 points)
Read Details(05.02 MC) The amount of cream sauce on the fettuccine at Al Fred-O’s follows a Normal distribution, with a mean of 3.78 ounces and a standard deviation of 0.14 ounce. A random sample of 12 plates of fettuccine is selected every day and the sauce is measured. What is the probability that the mean weight will exceed 3.81 ounces? (4 points)
Read DetailsA beam has dimensions of b = 14 in., h = 26 in., and d = 23.5 in. and is reinforced with 5 No. 7 bars. The concrete strength is 4,600 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth to the neutral surface is c = 4.010088 in., determine the strain in the reinforcement.
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