A survey was mailed to a total of 400 students; 100 were randomly selected from

Question

A survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used?
A. Systematic sample
B. Stratified sample
C. Simple random sample
D. Cluster sample



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. Only non-sampling errors
B. Errors due to interviewer bias and selection bias
C. Sampling errors only
D. Sampling errors and errors due to selection bias



3) A sufficiently large coverage error will result in which of the following?
A. Statistics about the actual population rather than the target population
B. Probability sampling
C. Inability to perform inferential statistics
D. Non-response bias



4) Which of the following is an example of statistical inference?
A. Calculating the mean age of patients discharged from hospitals in New York State in 1997.
B. Calculating the mean number of fruit trees damaged by Mediterranean fruit flies in California last year.
C. Calculating the amount of fly spray needed for your orchard next season.
D. Counting the number of patients who file malpractice suits after being discharged from hospitals in New York State.



5) Which of the following statements is false?
A. The main goal of descriptive statistics is to estimate characteristics of populations.
B. A summary measure calculated from some of the items of interest is a statistic.
C. Statistical inference is the process of making a prediction based on only a small piece of information.
D. A summary measure calculated from all items of interest is a parameter.



6) The collection and summarization of the socioeconomic and physical characteristics of the employees of a particular firm is an example of
A. a parameter.
B. descriptive statistics.
C. a statistic.
D. inferential statistics.



7) The _______ is a statement expressing a relationship between two variables or indicating differences between groups.
A. null hypothesis
B. alternative hypothesis
C. nondirectional hypothesis
D. directional hypothesis



8) In which of the following situations would a researcher prefer NOT to use a sample?
A. population is extremely large
B. census is expensive
C. no time constraints
D. sampling process is destructive

Explanation / Answer

1) Stratified Sample 2) D if you want more answers.. than post 1 question at a time please good luck

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