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41.

Normal Distributions [electronic resource]

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Covers density curves as smoothed histograms (mean, median, percentiles for density curves) and normal distributions (general shape, locating the mean and standard deviation, the 68-95-99.7 rule).
Online
1989
42.

Normal Calculations [electronic resource]

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Covers standardization and calculation of normal relative frequencies from tables, and assessment of normality by normal quantile plots. Emission standards and cholesterol studies are chosen as examples of normal calculations at work.
Online
1989
43.

Multidimensional Data Analysis [electronic resource]

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Covers the impact of computing technology on statistics, especially graphics for displaying multidimensional data. Examples are chosen from computing technology at Bell Communications Research.
Online
1989
44.

Inference for Relationships [electronic resource]

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Covers inference for simple linear regression, emphasizing slope and prediction.
Online
1989
45.

Models for Growth [electronic resource]

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Deals with mathematical models for simple kinds of growth over time. Linear growth is explained with a review of the geometry of straight lines and an introduction to least squares, exponential growth, prediction, and extrapolation.
Online
1989
46.

Inference for Two-Way Tables [electronic resource]

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Covers the chi-square test for independence/equal distributions in two-way tables.
Online
1989
47.

Inference for Proportions [electronic resource]

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Covers confidence intervals and tests for a single proportion and for comparing proportions based on paired and independent samples. Examples are chosen from government estimates on unemployment.
Online
1989
48.

What Is Probability? [electronic resource]

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Defines probability and presents basic rules for assigning probability, as well as an additional rule for disjointed events. Also distinguishes between deterministic phenomena and random phenomena.
Online
1989
49.

What Is Statistics? [electronic resource]

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Provides an overview of the nature and impact of statistics using historical anecdotes and contemporary applications.
Online
1989
50.

Time Series [electronic resource]

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Deals with distribution of a single variable, change over time, seasonal variation, inspecting time series for trends, and smoothing by averaging. Examples are chosen from the stock market.
Online
1989
51.

Significance Tests [electronic resource]

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Deals with the reasoning behind significance tests, null and alternative hypotheses and P-values, and cautions on the limited information provided by tests. A hiring discrimination case is used as an example.
Online
1989
52.

Samples and Surveys [electronic resource]

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Covers elaborate sample designs, such as stratified and multistage designs. Discusses the practical difficulties of a sampling distribution and sampling human populations. Uses a 1936 Gallup election poll to illustrate the problem of undercoverage.
Online
1989
53.

Geometric Sequences and Series [electronic resource]

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Provides examples of geometric sequences and series (f-stops on a camera and the bouncing of a ball), explaining the meaning of nonzero constant real number and common ratio. Finite and infinite geometric series and the sequence of partial sums are also defined in the discussion.
Online
1991
54.

The Sample Mean and Control Charts [electronic resource]

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Covers the sampling distribution of x̄, the central limit theorem, x̄ control charts, and statistical process control. Examples are chosen from the game of Roulette and business applications.
Online
1989
55.

Functions [electronic resource]

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Defines a function, develops an equation from real situations and discusses domain and range. The cutting of pizza and encoding of secret messages provide subjects for the demonstration of functions and their usefulness.
Online
1991
56.

Exponents and Radicals [electronic resource]

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Explains the properties of exponents and radicals: their definitions, their rules, and their applications to positive numbers. Shows how to use the Rules for Exponents to simplify expressions, demonstrating concepts through a discussion of the O-ring failure of the Challenger Space Shuttle.
Online
1991
57.

Factoring Polynomials [electronic resource]

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Defines polynomials and describes how the distributive property is used to multiply common monomial factors with the FOIL method. Covers factoring, the difference of two squares, trinomials as products of two binomials, the sum and difference of two cubes, and regrouping of terms.
Online
1991
58.

Exponential Functions [electronic resource]

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Covers graphing and developing the equation for an exponential function. Applications include bacteria growth, population growth, and radioactive decay.
Online
1991
59.

Ellipse and Hyperbola [electronic resource]

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Defines the two terms, distinguishing between them with different language, equations, and graphic representations. Architecture and surgery provide interesting application examples.
Online
1991
60.

Composition and Inverse Functions [electronic resource]

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Graphics are used to introduce composites and inverses of functions as applied to calculation of the Gross National Product. One-to-one functions and the horizontal line test are introduced, and more encoded messages and the hazards of the bends in scuba diving provide instructive applications of the functions discussed.
Online
1991