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Homework answers / question archive / Salem State University ODS 262 QUANTITATIVE ANALYSIS SUMMER SESSION - II , 1st EXAMINATION Multiple Choice: 1)The estimation of the population average family expenditure on food based on the sample average expenditure of 1,000 families is an example of: a
Salem State University
ODS 262
QUANTITATIVE ANALYSIS
SUMMER SESSION - II , 1st EXAMINATION
Multiple Choice:
1)The estimation of the population average family expenditure on food based on the sample average expenditure of 1,000 families is an example of:
a. inferential statistics.
b. descriptive statistics.
c. a parameter.
d. a statistic.
2. The portion of the universe that has been selected for analysis is called:
a. a sample.
b. a frame.
c. a parameter.
d. a statistic.
3. A summary measure that is computed to describe a characteristic of an entire population is called:
a. a parameter.
b. a census.
c. a statistic.
d. the scientific method.
4. Which of the following is most likely a parameter as opposed to a statistic?
a. the average score of the first five students completing an assignment.
b. the proportion of females registered to vote in a county.
c. the average height of people randomly selected from a database.
d. the proportion of trucks stopped yesterday that were cited for bad brakes.
5. A marketing research firm, in conducting a comparative taste test, provided three unlabeled types of peanut butter to a sample of households randomly selected within the state. Which of the four methods of data collection is involved ?
a. published sources.
b. experimentation outcome.
c. surveying.
d. observation.
6. Which of the following is a discrete quantitative variable?
a. the Dow Jones industrial average.
b. the volume of water released from a dam.
c. the distance you drove yesterday.
d. the number of employees of an insurance company.
7. Which of the following is a continuous quantitative variable?
a. the color of a student’s eyes.
b. the number of employees of an insurance company.
c. the amount of milk produced by a cow in one 24-hour period.
d. the number of gallons of milk sold at the local grocery store yesterday.
8. The classification of student class designation (freshman, sophomore, junior, senior) is an example of:
a. a categorical random variable.
b. a discrete random variable.
c. a continuous random variable.
d. a parameter.
9. A type of vertical bar chart in which the categories are plotted in the descending rank order of the magnitude of their frequencies is called a:
a. contingency table. b. Pareto diagram.
c. dot plot.
d. pie chart.
10. The width of each bar in a histogram corresponds to the:
a. differences between the boundaries of the class.
b. number of observations in each class.
c. midpoint of each class.
d. percentage of observations in each class.
11. When polygons or histograms are constructed, which axis must show the true zero or “origin”?
a. the horizontal axis. b. the vertical axis.
c. both the horizontal and vertical axes.
d. neither the horizontal nor the vertical axis.
12. When constructing charts, the following is plotted at the class midpoints:
a. pareto charts.
b. percentage polygons.
c. cumulative relative frequency ogives.
d. all of the above.
13. When studying the simultaneous responses to two categorical questions, we should set up a:
a. contingency table.
b. frequency distribution table.
c. cumulative percentage distribution table.
d. histogram.
14. In a contingency table, the number of rows and columns:
a. must always be the same.
b. must always be 2.
c. must add to 100%. d. none of the above.
15. Which of the following statistics is not a measure of central tendency?
a. arithmetic mean.
b. median.
c. mode. d. Q3.
16. Which measure of central tendency can be used for both numerical and categorical variables?
a. arithmetic mean.
b. median. c. mode.
d. geometric mean.
17. Which of the arithmetic mean, median, mode, and geometric mean are resistant measures of central tendency?
a. the arithmetic mean and median only. b. the median and mode only.
c. the mode and geometric mean only.
d. the arithmetic mean and mode only.
18. In a right-skewed distribution:
a. the median equals the arithmetic mean.
b. the median is less than the arithmetic mean.
c. the median is larger than the arithmetic mean.
d. none of the above.
19. Which of the following statements about the median is not true?
a. it is more affected by extreme values than the arithmetic mean.
b. it is a measure of central tendency.
c. it is equal to Q2.
d. it is equal to the mode in bell-shaped “normal” distributions.
20. In a perfectly symmetrical distribution:
a. the range equals the interquartile range.
b. the interquartile range equals the arithmetic mean. c. the median equals the arithmetic mean.
d. the variance equals the standard deviation.
21. When extreme values are present in a set of data, which of the following descriptive summary measures are most appropriate?
a. CV and range.
b. arithmetic mean and standard deviation. c. interquartile range and median.
d. variance and interquartile range.
22. In general, which of the following descriptive summary measures cannot be easily approximated from a box-and-whisker plot?
a. the variance.
b. the range.
c. the interquartile range.
d. the median.
23. The smaller the spread of scores around the arithmetic mean:
a. the smaller the interquartile range.
b. the smaller the standard deviation.
c. the smaller the coefficient of variation. d. all of the above.
24. Which descriptive summary measures are considered to be resistant statistics?
a. the arithmetic mean and standard deviation.
b. the interquartile range and range.
c. the mode and variance.
d. the median and interquartile range.
25. In right-skewed distributions, which of the following is the correct statement?
a. the distance from Q1 to Q2 is larger than the distance from Q2 to Q3. b. the distance from Q1 to Q2 is smaller than the distance from Q2 to Q3.
c. the arithmetic mean is smaller than the median.
d. the mode is larger than the arithmetic mean.
26. According to the empirical rule, if the data form a “bell-shaped” normal distribution, percent of the observations will be contained within 2 standard deviations around the arithmetic mean.
a. 68.26
b. 88.89
c. 93.75
d. 95.44
27. Which of the following is NOT a measure of central tendency?
a. the arithmetic mean.
b. the geometric mean.
c. the mode.
d. the interquartile range.
28. Which of the following is the easiest to manually compute?
a. the arithmetic mean.
b. the median.
c. the mode.
d. the geometric mean.
29. According to the Chebyshev rule, at least what percentage of the observations in any data set are contained within a distance of 2 standard deviations around the mean?
a. 67%
b. 75%
c. 88.89%
d. 95%
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