Find the area under the standard normal curve between z = 1.5 and z = 2.5.
A) 0.0606 B) 0.9938 C) 0.9332 D) 0.9816
Q. 2A medical researcher obtains a sample of adults suffering from diabetes. She randomly assigns 30 people to a treatment group and 30 to a placebo group.
The treatment group receives a medication over a period of three months and the placebo group receives a placebo over the same time frame. At the end of three months the patients' symptoms are evaluated. A) experiment B) observational study
Q. 3A teacher designs a test so a student who studies will pass 89 of the time, but a student who does not study will pass 6 of the time. A certain student studies for 91 of the tests taken.
On a given test, what is the probability that student passes? Round to the nearest thousandth when necessary. A) 0.815 B) 0.81 C) 0.475 D) 0.054
Q. 4Find the area under the standard normal curve between z = -1.5 and z = 2.5.
A) 0.9270 B) 0.7182 C) 0.6312 D) 0.9831
Q. 5True or False: Variance is the square root of standard deviation.
A) False B) True
Q. 6category of storm (gale, hurricane, etc.)
A) ordinal B) ratio C) nominal D) interval
Q. 7Two stores sell a certain product. Store A has 36 of the sales, 2 of which are of defective items, and store B has 64 of the sales, 4 of which are of defective items.
The difference in defective rates is due to different levels of pre-sale checking of the product. A person receives one of this product as a gift. What is the probability it is defective? Round to the nearest thousandth when necessary. A) 0.033 B) 0.03 C) 0.017 D) 0.38
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