A farmer wishes to test the effects of a new fertilizer on her wheat yield. She has four equal-sized plots of land-- one with sandy soil, one with rocky soil, one with clay-rich soil, and one with average soil.
She divides each of the four plots into three equal-sized portions and randomly labels them A, B, and C. The four A portions of land are treated with her old fertilizer. The four B portions are treated with the new fertilizer, and the four C's are treated with no fertilizer. At harvest time, the wheat yield is recorded for each section of land. What is the treatment in this experiment?
A) the section of land (A, B, or C)
B) the fertilizers
C) the wheat yield recorded for each section of land
D) the four types of soil
Q. 2A population proportion is to be estimated and a 95 degree of confidence is desired. In general, if one wishes to decrease the margin of error by a factor of 3 (for example from E = 0.03 to 0.01), how will the necessary sample size change?
A) It will decrease by a factor of 9 B) It will increase by a factor of 9
C) It will increase by a factor of 3 D) It will decrease by a factor of 3
Q. 3In a random sample of 360 women, 65 favored stricter gun control laws. In a random sample of 220 men, 60 favored stricter gun control laws.
At the 0.05 significance level, do the data provide sufficient evidence to conclude that the proportion of women favoring stricter gun control is higher than the proportion of men favoring stricter gun control?
Q. 4time spent playing basketball
A) ratio B) nominal C) interval D) ordinal
Q. 5The amount of soda a dispensing machine pours into a 12 ounce can of soda follows a normal distribution with a mean of 12.36 ounces
and a standard deviation of 0.24 ounce. The cans only hold 12.60 ounces of soda. Every can that has more than 12.60 ounces of soda poured into it causes a spill and the can needs to go through a special cleaning process before it can be sold. What is the probability a randomly selected can will need to go through this process?
A) 0.6587 B) 0.3413 C) 0.1587 D) 0.8413
Q. 6Suppose that you know the area under the standard normal curve to the right of -1.7. How could you use this to find the area under the standard normal curve to the right of 1.7? Explain your reasoning.
What will be an ideal response?
Q. 7A student scores 62 on a geography test and 285 on a mathematics test. The geography test has a mean of 80 and a standard deviation of 15. The mathematics test has a mean of 300 and a standard deviation of 10.
If the data for both tests are normally distributed, on which test did the student score better relative to the other students in each class?
A) The student scored better on the mathematics test.
B) The student scored better on the geography test.
C) The student scored the same on both tests.
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