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Extra resources for Schaum's Outline of Beginning Statistics, Second Edition (Schaum's Outline Series)
2 Fig. 33 gives the distribution of response times in minutes for 911 emergency calls classified as domestic disturbance calls. Give the lower and upper class limits and boundaries as well as the class marks for each class. What is the class width for the distribution? 33 Response time 5–9 10–14 15–19 20–24 25–29 30–34 Frequency 3 7 25 19 14 2 Ans. 34. 34 Lower Upper limit boundary 9 14 19 24 29 34 The class width equals 5 minutes. 5 7 12 17 22 27 32 CHAP. 33 in the “less than” form. Ans. 35. 36 gives the response times in minutes for 50 randomly selected 911 emergency calls classified as robbery in progress calls.
When the data are examined, it is seen that 40 occurs three times, and that no other value occurs that often. The mode is equal to 40. For a large data set, as the number of classes is increased (and the width of the classes is decreased), the histogram becomes a smooth curve. Oftentimes, the smooth curve assumes a shape like that shown in Fig. 3-1. In this case, the data set is said to have a bell-shaped distribution or a mound-shaped distribution. For such a distribution, the mean, median, and mode are equal and they are located at the center of the curve.
Ans. (a) The number of times that the moving authority must be sent is countable and therefore these data are quantitative and discrete. (b) These data are categorical or qualitative. (c) The length of material can be any number within an interval of values, and therefore these data are quantitative and continuous. (d) These data are categorical or qualitative (e) Each value in the data set would be one of the five numbers 0, 1, 2, 3, or 4. These data are quantitative and discrete. 2 The following list gives the academic ranks of the 25 female faculty members at a small liberal arts college: instructor associate professor full professor full professor assistant professor full professor associate professor assistant professor assistant professor associate professor associate professor assistant professor assistant professor assistant professor associate professor instructor assistant professor associate professor assistant professor instructor assistant professor assistant professor instructor assistant professor assistant professor Give a frequency distribution for these data.