The nonparametric methods, or distribution-free methods as they are also known, do not depend on the distribution of the population being sampled, but they depend on the distribution of the sample itself.
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Q. 2When sampling without replacement, the appropriate probability distribution is:
a. a binomial distribution
b. a hypergeometric distribution
c. a Poisson distribution
d. all of these
Q. 3Which of the following best defines an interval estimate?
a. It is a sampling procedure that matches each unit from population A with a twin from population B so that any sample observation about a unit in population A automatically yields an associated observation about a unit in population B.
b. It is an estimate of a population parameter that is expressed as a range of values within which the unknown but true parameter presumably lies.
c. It is a sample statistic such that the mean of all its possible values equals the population parameter the statistic seeks to estimate.
d. It is the sum of an estimator's squared bias plus its variance.
e. It is the sum of an estimator's squared bias plus the population mean .
Q. 4The Runs test is the nonparametric counterpart of the parametric t-test for two dependent means.
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Q. 5A warehouse contains six parts made by company A and ten parts made by company B. If four parts are selected at random from the warehouse, the probability that all four parts are from company B is approximately .008.
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Q. 6The lower limit of a confidence interval at the 95 level of confidence for the population proportion if a sample of size 100 had 30 successes is:
a. 0.3898
b. 0.2102
c. 0.2959
d. 0.3041
e. 0.3126
Q. 7When choosing between parametric and nonparametric tests, we are interested primarily in the control of error, the relative power of the test, and efficiency.
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