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20 Cards in this Set
- Front
- Back
You are less likely to be misled by a graph if you:
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focus your attention on the numerical values that the graph represents and avoid being influenced by the graph's caption.
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The classification of student major (accounting, economics, management, marketing, other) is an example of:
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a categorical random variable.
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The strength of the linear relationship between two numerical variables may be measured by the:
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coefficient of correlation.
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The total area of the five bars in a relative frequency histogram for which the width of each bar is nine units is:
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9.
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The two graphical techniques we usually use to present interval data are:
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histogram and ogive.
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Which of the following statistics is not a measure of central tendency?
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interquartile range
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Air France Internet site provides a questionnaire instrument that can be answered electronically. Which method of data collection is involved when people complete the questionnaire?
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surveying
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In general, incomes of employees in large firms tend to be:
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positively skewed.
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The length of the box in the box-and-whisker plot portrays the:
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interquartile range.
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A company has developed a new computer sound card, but the average lifetime is unknown. In order to estimate this average, 200 sound cards are randomly selected from a large production line and tested and the average lifetime is found to be 5 years. The 5 years represent the:
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statistic.
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A perfect straight line sloping downward would produce a correlation coefficient equal to:
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-1
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In general, the scatter diagram of two interval variables may reveal that:
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All of these choices are true statements.
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A university employs 2500 faculty and staff. To ascertain how the employees feel regarding a health insurance plan, 250 of the employees are surveyed. The 250 employees who were surveyed constitute a sample.
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True
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In a set of numerical data with bell shaped histogram, the value for Q2 is always halfway between Q1 and Q3
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True
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The interquartile range is found by taking the difference between the 1st and 3rd quartiles.
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True
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When every possible sample with the same number of observations is equally likely to be chosen, the selected sample is called:
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simple random sample.
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Which of the following statements is false?
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All calculations are permitted on nominal data.
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Since the population is always larger than the sample, the population mean:
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can be smaller than, or larger than, or equal to the sample mean.
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A summary measure that is computed from a sample to describe a characteristic of the population is called a parameter.
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False
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The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a videocassette recorder made by the company over the past 12 months are satisfied with their products. If there are 4 different brands of videocassette recorders made by the company, the best sampling strategy would be to use a:
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stratified sample.
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