True or False: The chi-square distribution is a symmetric distribution is negative when the degrees of freedom become large.
A) False B) True
Q. 2A farmer wishes to test the effects of a new fertilizer on her soybean 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 Cs are treated with no fertilizer. At harvest time, the soybean yield is recorded for each section of land. What is the treatment in this experiment? A) the fertilizers
B) the soybean yield recorded for each section of land
C) the section of land (A, B, or C)
D) the four types of soil
Q. 3You are taking a multiple-choice test that has 9 questions. Each of the questions has 5 choices, with one correct choice per question.
If you select one of these options per question and leave nothing blank, in how many ways can you answer the questions? A) 1,953,125 B) 45 C) 59,049 D) 14
Q. 4Suppose a population has a mean weight of 180 pounds and a standard deviation of 25 pounds. A sample of 100 items is drawn from this population. What is the standard error of the mean?
A) 2.5 B) 1.8 C) 18.0 D) 0.25
Q. 5True or False: The chi-square distribution is a symmetric distribution for all degrees of freedom.
A) False B) True
Q. 6A farmer wishes to test the effects of a new fertilizer on her potato 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 Cs are treated with no fertilizer. At harvest time, the potato yield is recorded for each section of land. What is the response variable in this experiment? A) the potato yield recorded for each section of land
B) the type of fertilizer (old, new, or none)
C) the section of land (A, B, or C)
D) the four types of soil
Q. 7A person can order a new car with a choice of 8 possible colors, with or without air conditioning, with or without heated seats, with or without anti-lock brakes, with or without power windows, and with or without a CD player.
In how many different ways can a new car be ordered in terms of these options? A) 256 B) 128 C) 512 D) 16
Q. 8Suppose a population has a mean of 7 for some characteristic of interest and a standard deviation of 9.6. A sample is drawn from this population of size 64. What is the standard error of the mean?
A) 1.2 B) 0.7 C) 0.15 D) 3.3
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