Math 1016- Ch. 2.1, 2.2, 2.3
Give conclusions that can be drawn from the graph.
C. Too-cautious drivers irk drivers the least Your answer is correct. D. Tailgaters irk drivers the most
Use the given frequency distribution to find the (a) class width. (b) class midpoints. (c) class boundaries.
CW= 5 Midpoint 37,42,47,52,57,62,67 class boundaries 34.5 - 39.5 40 dash 44 3 39.5 - 44.5 45 dash 49 5 44.5 - 49.5 50 dash 54 11 49.5 - 54.5 55 dash 59 7 54.5 - 59.5 60 dash 64 7 59.5 - 64.5 65 dash 69 1 64.5 - 69.5
What are some benefits of using graphs of frequency distributions?
It can be easier to identify patterns of a data set by looking at a graph of the frequency distribution.
What are some benefits of representing data sets using frequency distributions?
Organizing the data into a frequency distribution can make patterns within the data more evident.
How is a Pareto chart different from a standard vertical bar graph?
The bars are positioned in order of decreasing height with the tallest bar on the left.
Use the given minimum and maximum data entries, and the number of classes, to find the class width, the lower class limits, and the upper class limits. minimumequals12, maximumequals85, 7 classes
The class width is 11. The lower class limits are 12 comma 23 comma 34 comma 45 comma 56 comma 67 comma 78. The upper class limits are 22 comma 33 comma 44 comma 55 comma 66 comma 77 comma 88.
The scores and their percent of the final grade for a statistics student are given. What is the student's weighted mean score? Score Percent of final grade Homework 84 20% Quiz 84 10% Quiz 91 10% Project 96 25% Final Exam 85 35%
88.05
Use the frequency distribution shown below to construct an expanded frequency distribution. High Temperatures (degrees Upper F)
Class Frequency Midpoint Relative frequency Cumulative frequency 18-28 17 23 . 05 17 29-39 44 34 . 12 61 40-50 67 45 . 18 128 51-61 68 56 . 19 196 62-72 77 67 . 21 273 73-83 67 78 . 18 340 84-94 25 89 . 07 365
After constructing a relative frequency distribution summarizing IQ scores of college students, what should be the sum of the relative frequencies?
If percentages are used, the sum should be 100%. If proportions are used, the sum should be 1.
The number of credits being taken by a sample of 13 full-time college students are listed below. Find the mean, median, and mode of the data, if possible. If any measure cannot be found or does not represent the center of the data, explain why. 8 10 11 11 8 7 7 7 9 7 7 7 8
Mean 8.2 Does the mean represent the center of the data? The mean represents the center. Median 8 Does the mean represent the center of the data? The mean represents the center. Mode 7 The mode(s) does (do) not represent the center because it (one) is the smallest data value.
Determine whether the following statement is true or false. If it is false, rewrite it as a true statement. The mean is the measure of central tendency most likely to be affected by an outlier.
The statement is true.
Use the stem-and-leaf plot to list the actual data entries. What is the maximum data entry? What is the minimum data entry? Key: 2 | 5 equals 25 2 5 3 2 4 1 2 2 5 7 7 9 5 0 1 1 2 3 3 3 4 4 4 4 5 6 6 8 9 6 9 9 9 7 3 9 9 8 4
data entries 25, 32, 41, 42, 42, 45, 47, 47, 49, 50, 51, 51, 52, 53, 53, 53, 54, 54, 54, 54, 55, 56, 56, 58, 59, 69, 69, 69, 73, 79, 79, 84 The maximum data entry is 84. The minimum data entry is 25.
Use the dot plot to list the actual data entries. What is the maximum data entry? What is the minimum data entry?
data entries D. 12, 12, 13, 13, 13, 14, 14, 14, 14, 14, 15, 16, 16, 17, 18 The maximum data entry is 18. The minimum data entry is 12.
Use the given minimum and maximum data entries, and the number of classes, to find the class width, the lower class limits, and the upper class limits. minimumequals21, maximumequals131, 8 classes
lower class limits C. 21, 35, 49, 63, 77, 91, 105, 119 upper class limits A. 34, 48, 62, 76, 90, 104, 118, 132
