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Question
When calculating prediction intervals for predicted values of y based on a given x, all 95 percent prediction intervals will be of equal width.
Answer
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Related questions
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Data gathered from a structured interview is generally easier to analyze than data collected from an unstructured interview.
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Data collected using open-end questions is generally easier to analyze than data collected from closed-end questions.
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When an interviewer asks a specified series of questions in the course of a personal interview, he/she is conducting an unstructured interview.
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One way to improve the response rate for a survey is to administer the surveys directly to the respondents.
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Typically, it is possible to include a larger number of questions in a phone survey than in a mail survey since it takes less time to complete the survey over the phone.
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Descriptive statistical tools include graphs, charts, and numerical measures.
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An accountant has recently prepared a report for a client that contains a variety of graphs and charts. In doing so, she has used descriptive statistical methods.
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Descriptive statistics allow a decision maker to reach a conclusion about a population based on a subset from the population.
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A stem and leaf diagram is an alternative to using:
A) a pie chart.
B) a bar chart.
C) a histogram.
D) an ogive.
Q:
Which of the following is true about the difference between stem and leaf diagrams and histograms?
A) There is no difference.
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D) The stem and leaf diagram shows less information than a histogram.
Q:
Which of the following is a false statement?
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In forming the classes for a frequency distribution and histogram, suppose there were a number of empty classes. You should:
A) increase the class width.
B) decrease the class width.
C) keep the current class width.
D) use an ogive instead.
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A histogram is used to display which of the following characteristics for a quantitative variable?
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B) The spread in the data
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As a member of the student council at your university, you have been assigned the task of conducting a phone survey of undergraduate students to determine satisfaction with the campus food service. Explain how you would go about selecting a simple random sample.
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Which of the following statements is true?
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The human resources department at a major high tech company plans to conduct an employee satisfaction study by sampling 100 employees from the 3,000 total employees. They plan to use systematic random sampling since the employee file is in alphabetic order. The first employee selected in the study should be:
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One of the major challenges for developing a good written questionnaire or telephone survey instrument is that:
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Based on the empirical rule we can assume that all bell-shaped distributions have approximately 95 percent of the values within 2 standard deviations of the mean.
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Suppose the standard deviation for a given sample is known to be 20. If the data in the sample are doubled, the standard deviation will be 40.