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What is the difference between probability sampling and simple random sampling?

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1) What is the difference between probability sampling and simple random sampling?;A. There is no difference.;B. Probability sampling is a type of simple random sample.;C. Simple random sampling is a type of probability sampling.;D. In probability sampling each item has an identical chance of being chosen.;2) A poll is planned to determine what proportion of all students favor an increase in fees to support a new track and field stadium. A questionnaire will be published and the first 1000 completed questionnaires will be analyzed. Which of the following errors will be associated with the sample?;A. Sampling errors and errors due to selection bias;B. Errors due to interviewer bias and selection bias;C. Only non-sampling errors;D. Sampling errors only;3) A statistician working for the Department of the Interior is constructing a systematic random sample of trees in a forest preserve. All trees have been identified and numbered with a non-invasive number attached to the bark. The statistician wishes to estimate the mean height of the trees in the forest preserve, and has calculated an appropriate sample size of n=43 trees. The 587th of the 731 trees in the preserve was selected as the first observation in the sample. What is the tree number of the second observation in the sample?;A. 544;B. 588;C. 604;D. 630;4) Which of the following is not a characteristic of an ideal statistician?;A. Technically current (e.g. software);B. Communicates well (both written and oral);C. Adapts answers to client desires;D. Can deal with imperfect information;5) Which of the following statements is false?;A. A summary measure calculated from all items of interest is a parameter.;B. A summary measure calculated from some of the items of interest is a statistic.;C. The main goal of descriptive statistics is to estimate characteristics of populations.;D. Statistical inference is the process of making a prediction based on only a small piece of information.;6) Which of the following is an example of statistical inference?;A. Counting the number of patients who file malpractice suits after being discharged from hospitals in New York State.;B. Calculating the mean number of fruit trees damaged by Mediterranean fruit flies in California last year.;C. Calculating the mean age of patients discharged from hospitals in New York State in 1997.;D. Calculating the amount of fly spray needed for your orchard next season.

 

Paper#32033 | Written in 18-Jul-2015

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