EC315 Quiz Help 1

# EC315 Quiz Help 1 - Quiz Review 1 A new drug has been...

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1. A new drug has been developed that is found to relieve nasal congestion in 90 percent of those with the condition. The new drug is administered to 300 patients with the condition. What is the probability that more than 265 will be relieved of nasal congestion? A: 0.0916 B:0.1922 C:0.8078 D:0.3078 2. For the normal distribution, the mean plus and minus 1.96 standard deviations will include about what percent of the observations? A: 50% B: 99.7% C: 95% D: 68% 3. For a standard normal distribution, what is the probability that z is greater than 1.75? A: 0.0401 B: 0.0459 C: 0.4599 D: 0.9599 4. What is the area under the normal curve between z = 0.0 and z = 1.79? A: 0.4633 B: 0.0367 C: 0.9599 D: 0.0401 5. What is the area under the normal curve between z = – 1.0 and z = –2.0? A: 0.0228 B: 0.3413 C: 0.1359 D: 0.4772 6. The mean amount spent by a family of four on food per month is \$500 with a standard deviation of \$75. Assuming that the food costs are normally distributed, what is the probability that a family spends less than \$410 per

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## This note was uploaded on 11/11/2011 for the course EC 315 taught by Professor Barcus during the Spring '10 term at Park.

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EC315 Quiz Help 1 - Quiz Review 1 A new drug has been...

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