# Read e-book online An Introduction to Statistics PDF

By George Woodbury

ISBN-10: 0534377556

ISBN-13: 9780534377557

Many data texts lack well-defined connections between fabrics provided, as though the several issues have been disjointed. during this new textual content, George Woodbury effectively illustrates the traditional connections among likelihood and inferential facts and among self assurance durations and speculation trying out, for instance. in the course of the textual content, the writer offers motives which are effortless to persist with and examples which are concept-based.

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Extra info for An Introduction to Statistics

Example text

The class mark for a given class is the midpoint of the class. lower class limit + upper class limit Class mark = ᎏᎏᎏᎏᎏ 2 In the previous frequency distribution, the first class mark is 45. 40 + 50 ᎏᎏ = 45 2 Score 40–55 50–65 60–75 70–85 85–100 Score 40–48 52–65 65–73 76–89 89–100 The other class marks are 55, 65, 75, 85, and 95. Now that we have discussed the terminology for frequency distributions Frequency and seen what one looks like, we can focus on the guidelines for creating one. There are two rules that must be followed.

We place a point there, and then repeat this for the rest of the class marks. We connect each of the points, from left to right, with line segments to produce the frequency polygon shown on the left. ■ F Infielders Frequency 7 A 3 2 4 9 7 7 Bar Charts Grades on Exam 1 10 9 8 7 6 5 4 3 2 1 0 Frequency On the San Francisco Giants current roster there are 12 pitchers, 3 catchers, 5 infielders, and 5 outfielders. Create a bar chart for these data. There will be four bars in this chart: one for pitchers, a second for catchers, a third for infielders, and a fourth for outfielders.

35. 36. S. ) Number of passengers whose baggage was mishandled Height of two-year-old baby boys For the following scenarios, determine which sampling technique was used. Also list biases that may be present. 37. Average weight of newborn baby boys: Twelve hospitals are selected at random, and the weight of each baby boy born in January is recorded. 38. Percentage of 18- to 25-year-olds who used drugs during the past 30 days: At a shopping mall, people who appear to be in the proper age group are stopped and asked for their age and whether they have used drugs in the past 30 days.