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MIDTERM EXAM MC306 True/False Please indicate if the following statements are true or false. 1. The variable of height is an example of a quantitative variable. True 2. Rating a restaurant by a number of stars is an example of an ordinal level of measurement. True 3. In a research study, it is always preferable for the researcher to choose his participants as carefully as possible rather than randomly accept samples. False 4. In the following chart, the height is the independent variable and the age of the tree is the dependent variable. False 5. The lower class limit represents the smallest data value that can be included in the class . True 6. The cumulative frequency is the sum of the frequencies accumulated to the upper boundary of a class in the distribution. True 7. A frequency polygon and a histogram have the same overall shape. True 8. A histogram is a graph that represents the cumulative frequencies for the classes in a frequency distribution. False 9. A stem and leaf plot is useful for keeping more precision than a grouped frequency distribution. True 10. A time series graph represents data that occur over a specific period. 11. A time series graph is useful for detecting long term trends over a period of time. True 12. A stem and leaf plot is a data plot that uses part of a data value as the stem and part of the data value as the leaf to form groups or classes. True 13. The mode of a set of data can be computed only when the data is numeric. False 14. The median can be a more appropriate measure of central tendency if the distribution of the data is extremely skewed. True 15. The coefficient of variation is the mean divided by the standard deviation expressed as a percentage. False 1
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MIDTERM EXAM MC306 16. Two events are mutually exclusive if they cannot occur at the same time. True 17. When the outcome or occurrence of the first event does not affect the outcome or occurrence of the second event in such a way that the probability is changed, the events are said to be dependent. True 18. The number of different arrangements of four pictures from a selection of ten pictures is 5,040. True 19. Continuous random variables are obtained from data that can be measured rather than counted. True 20. Discrete variables have values that can be measured. True 21. If the standard deviation of a probability distribution is 6.25, the variance is 2.30. False 22. The probability of a success must remain the same for each trial in a binomial experiment. True 23. When sampling is done without replacement, the binomial distribution does not give exact probabilities because the trials are not independent. True 24. When the majority of the data values fall to the right of the mean, the distribution is said to be left skewed . True 25. The normal distribution curve can be used as a probability distribution curve for normally distributed variables. True 26. The total area under the normal distribution curve is approximately 0.99 but can never be equal to 1.0. False 27. The area under the normal distribution curve that lies within three standard deviations of the mean is approximately 95%.
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