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Chapter 12: Q. 22 (page 764)
What is the correlation between the selling price and appraised value?
(a) 0.1126
(c) -0.861
(e) -0.928
(b) 0.861
(d) 0.928
(d) 0.928
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An experimenter wishes to test whether or not two types of fish food (a standard fish food and a new product) work equally well at producing fish of equal weight after a two-month feeding program. The experimenter has two identical fish tanks (1 and 2) to put fish in and is considering how to assign , each of which has a numbered tag, to the tanks. The best way to do this would be to
(a) put all the odd-numbered fish in one tank, the even in the other, and give the standard food type to the odd-numbered ones.
(b) obtain pairs of fish whose weights are virtually equal at the start of the experiment and randomly assign one to Tank 1 and the other to , with the feed assigned at random to the tanks.
(c) proceed as in part (b), but put the heavier of the pair into .
(d) assign the fish at random to the two tanks and give the standard feed to .
(e) not proceed as in part (b) because using the initial weight in part (b) is a nonrandom process. Use the initial length of the fish instead.
Snowmobiles
(a) If we choose a survey respondent at random, what鈥檚 the probability that this individual (i) is a snowmobile owner? (ii) belongs to an environmental organization or owns a snowmobile? (iii) has never used a snowmobile given that the person belongs to an environmental organization?
(b) Are the events 鈥渋s a snowmobile owner鈥� and 鈥渂elongs to an environmental organization鈥� independent for the members of the sample? Justify your answer.
(c) If we choose two survey respondents at random, what鈥檚 the probability that (i) both are snowmobile owners? (ii) at least one of the two belongs to an environmental organization?
A set of cards consists of red cards and black cards. The cards are shuf铿俥d thoroughly, and you choose one at random, observe its color, and replace it in the set. The cards are thoroughly reshuf铿俥d, and you again choose a card at random, observe its color, and replace it in the set. This is done a total of four times. Let be the number of red cards observed in these four trials.
The random variable has which of the following probability distributions?
(a) The Normal distribution with mean and standard deviation
(b) The binomial distribution with androle="math" localid="1650534915843"
(c) The binomial distribution with and
(d) The binomial distribution with and
(e) The geometric distribution with
Which of the following sampling plans for estimating the proportion of all adults in a medium-sized town who favor a tax increase to support the local school system does not suffer from undercoverage bias?
(a) A random sample of names from the local phone book
(b) A random sample of parents whose children attend one of the local schools
(c) A sample consisting of people from the city who take an online survey about the issue
(d) A random sample of homeowners in the town
(e) A random sample of people from an alphabetical list of all adults who live in the town
Below are boxplots of SAT Critical Reading and Math scores for a randomly selected group of female juniors at a highly competitive suburban school.
Which of the following cannot be justified by the plots shown above?
(a) The maximum Critical Reading score is higher than the maximum Math score.
(b) Critical Reading scores are skewed to the right, whereas Math scores are somewhat skewed to the left.
(c) The median Critical Reading score for females is slightly higher than the median Math score.
(d) There appear to be no outliers in the SAT score distributions.
(e) The mean Critical Reading score and the mean Math score for females are about the same.
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