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| 1 | |
Which of the following is definitely a statistic? |
| | A) | the median family income in the United States |
| | B) | the mean number of absences per day in one school district during one school year |
| | C) | the range of running times at the Boston Marathon |
| | D) | the percentage of defective units in a random sample of units produced at a manufacturing plant |
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| 2 | |
Which of the following is an example of categorical data? |
| | A) | ages of volunteers at a community service center |
| | B) | zip codes of shoppers at an appliance store |
| | C) | SAT scores of students who took the SAT in March |
| | D) | square footage of high school gymnasiums in Nebraska |
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| 3 | |
The median is a better index of central tendency than the mean when the distribution is |
| | A) | symmetrical. |
| | B) | skewed. |
| | C) | normal. |
| | D) | bimodal. |
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| 4 | |
What percentage of the scores is contained in the box in a boxplot? |
| | A) | 34% |
| | B) | 50% |
| | C) | 68% |
| | D) | 100% |
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| 5 | |
What is the z score for a raw score of 40 that comes from a distribution with a mean of 50 and a standard deviation of 5? |
| | A) | -2 |
| | B) | -1 |
| | C) | 1 |
| | D) | 2 |
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| 6 | |
Which of the following correlations would be the most likely value of Pearson's r for the relationship of the time spent practicing typing to the number of errors made on a typing test? |
| | A) | -0.55 |
| | B) | 0 |
| | C) | 0.82 |
| | D) | 1.47 |
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| 7 | |
A crossbreak table is used for analyzing the data obtained for |
| | A) | one categorical variable. |
| | B) | one quantitative variable. |
| | C) | two categorical variables. |
| | D) | two quantitative variables. |
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| 8 | |
When researchers describe the information contained in many scores with just a few indices, such as the mean or median, and these are calculated for a sample drawn from a population, they are called |
| | A) | statistics. |
| | B) | parameters. |
| | C) | modes. |
| | D) | analysis. |
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| 9 | |
When indices such as the mean or median are calculated from the entire population, they are called |
| | A) | medians. |
| | B) | parameters. |
| | C) | statistics. |
| | D) | means. |
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| 10 | |
Of the two fundamental types of numerical data, those which differ in kind are called |
| | A) | quantitative. |
| | B) | statistical. |
| | C) | categorical. |
| | D) | parameters. |
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| 11 | |
Of the two fundamental types of numerical data, those which differ in degree or amount and are reported in terms of numbers and values are called |
| | A) | quantitative. |
| | B) | statistical. |
| | C) | categorical. |
| | D) | parameters. |
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| 12 | |
Normal distribution is best described when |
| | A) | researchers draw a smooth curve instead of the series of straight lines in a frequency polygon. |
| | B) | the tail of the distribution trails off to the left, in the direction of the lower, more negative, score values. |
| | C) | the tail of the distribution trails off to the right, in the direction of the higher, more positive, score values. |
| | D) | the large majority of scores are concentrated in the middle of the distribution, and the scores decrease in frequency the father away from the middle they are. |
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| 13 | |
What is the mode in the following distribution? 25, 17, 23, 23, 24, 25, 23 |
| | A) | 25 |
| | B) | 23 |
| | C) | 17 |
| | D) | 24 |
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| 14 | |
Distribution curves are best described when |
| | A) | the tail of the distribution trails off to the left, in the direction of the lower, more negative, score values. |
| | B) | the tail of the distribution trails off to the right, in the direction of the higher, more positive, score values. |
| | C) | researchers draw a smooth curve instead of the series of straight lines in a frequency polygon. |
| | D) | the large majority of scores are concentrated in the middle of the distribution, and the scores decrease in frequency the father away from the middle. |
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| 15 | |
A negatively skewed distribution is best described when |
| | A) | the tail of the distribution trails off to the right, in the direction of the higher, more positive, score values. |
| | B) | the tail of the distribution trails off to the left, in the direction of the lower, more negative, score values. |
| | C) | the large majority of scores are concentrated in the middle of the distribution, and the scores decrease in frequency the father away from the middle. |
| | D) | when researchers draw a smooth curve instead of the series of straight lines in a frequency polygon. |
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