 9.4.49: Consider the following two questions designed to assessquantitative...
 9.4.50: Recent incidents of food contamination have caused greatconcern amo...
 9.4.51: It is well known that a placebo, a fake medication ortreatment, can...
 9.4.52: Do teachers find their work rewarding and satisfying?The article Wo...
 9.4.53: Olestra is a fat substitute approved by the FDA for use insnack foo...
 9.4.54: Teen Court is a juvenile diversion program designed to circumvent t...
 9.4.55: In medical investigations, the ratio u 5 p1yp2 is often ofmore inte...
 9.4.56: Sometimes experiments involving success or failureresponses are run...
 9.4.57: Two different types of alloy, A and B, have been used to manufactur...
 9.4.58: Using the traditional formula, a 95% CI for p1 2 p2 is tobe constru...
Solutions for Chapter 9.4: Inferences Concerning a Difference Between Population Proportions
Full solutions for Probability and Statistics for Engineering and the Sciences  9th Edition
ISBN: 9781305251809
Solutions for Chapter 9.4: Inferences Concerning a Difference Between Population Proportions
Get Full SolutionsChapter 9.4: Inferences Concerning a Difference Between Population Proportions includes 10 full stepbystep solutions. This expansive textbook survival guide covers the following chapters and their solutions. This textbook survival guide was created for the textbook: Probability and Statistics for Engineering and the Sciences, edition: 9. Probability and Statistics for Engineering and the Sciences was written by and is associated to the ISBN: 9781305251809. Since 10 problems in chapter 9.4: Inferences Concerning a Difference Between Population Proportions have been answered, more than 88720 students have viewed full stepbystep solutions from this chapter.

Acceptance region
In hypothesis testing, a region in the sample space of the test statistic such that if the test statistic falls within it, the null hypothesis cannot be rejected. This terminology is used because rejection of H0 is always a strong conclusion and acceptance of H0 is generally a weak conclusion

Alternative hypothesis
In statistical hypothesis testing, this is a hypothesis other than the one that is being tested. The alternative hypothesis contains feasible conditions, whereas the null hypothesis speciies conditions that are under test

Attribute
A qualitative characteristic of an item or unit, usually arising in quality control. For example, classifying production units as defective or nondefective results in attributes data.

Bias
An effect that systematically distorts a statistical result or estimate, preventing it from representing the true quantity of interest.

Bivariate normal distribution
The joint distribution of two normal random variables

Chisquare (or chisquared) random variable
A continuous random variable that results from the sum of squares of independent standard normal random variables. It is a special case of a gamma random variable.

Coeficient of determination
See R 2 .

Contingency table.
A tabular arrangement expressing the assignment of members of a data set according to two or more categories or classiication criteria

Contour plot
A twodimensional graphic used for a bivariate probability density function that displays curves for which the probability density function is constant.

Counting techniques
Formulas used to determine the number of elements in sample spaces and events.

Covariance matrix
A square matrix that contains the variances and covariances among a set of random variables, say, X1 , X X 2 k , , … . The main diagonal elements of the matrix are the variances of the random variables and the offdiagonal elements are the covariances between Xi and Xj . Also called the variancecovariance matrix. When the random variables are standardized to have unit variances, the covariance matrix becomes the correlation matrix.

Crossed factors
Another name for factors that are arranged in a factorial experiment.

Dependent variable
The response variable in regression or a designed experiment.

Design matrix
A matrix that provides the tests that are to be conducted in an experiment.

Error of estimation
The difference between an estimated value and the true value.

Estimate (or point estimate)
The numerical value of a point estimator.

F distribution.
The distribution of the random variable deined as the ratio of two independent chisquare random variables, each divided by its number of degrees of freedom.

Factorial experiment
A type of experimental design in which every level of one factor is tested in combination with every level of another factor. In general, in a factorial experiment, all possible combinations of factor levels are tested.

Gamma random variable
A random variable that generalizes an Erlang random variable to noninteger values of the parameter r

Geometric random variable
A discrete random variable that is the number of Bernoulli trials until a success occurs.