 21.1: Canada Suppose an advocacy organization surveys 960 Canadians and 1...
 21.2: Nonprofits Do people who work for nonprofit organizations differ ...
 21.3: Canada, deux The information in Exercise 1 was used to create a 95%...
 21.4: Nonprofits, part The researchers from Exercise 2 created a 95% con...
 21.5: How do you get online? A 2013 Pew Research survey of 802 teens foun...
 21.6: Social network news In 2012, Pew Research noted that 34% of young a...
 21.7: Name recognition A political candidate runs a weeklong series of TV...
 21.8: Origins In a 1993 Gallup poll, 47% of the respondents agreed with t...
 21.9: Revealing information 886 randomly sampled teens were asked which o...
 21.10: Regulating access When a random sample of 935 parents were asked ab...
 21.11: Gender gap A presidential candidate fears he has a problem with wom...
 21.12: Buy it again? A consumer magazine plans to poll car owners to see i...
 21.13: Arthritis The Centers for Disease Control and Prevention reported a...
 21.14: Graduation In October 2000 the U.S. Department of Commerce reported...
 21.15: Pets Researchers at the National Cancer Institute released the resu...
 21.16: Carpal tunnel The painful wrist condition called carpal tunnel synd...
 21.17: Prostate cancer There has been debate among doctors over whether su...
 21.18: Race and smoking Data collected in 2010 by the Behavioral Risk Fact...
 21.19: Ear infections A new vaccine was recently tested to see if it could...
 21.20: Anorexia The Journal of the American Medical Association reported o...
 21.21: Another ear infection In Exercise 19 you used a confidence interval...
 21.22: Anorexia again In Exercise 20 you used a confidence interval to exa...
 21.23: Teen smoking, part I A Vermont study published by the American Acad...
 21.24: Depression A study published in the Archives of General Psychiatry ...
 21.25: Teen smoking, part II Consider again the Vermont study discussed in...
 21.26: Depression revisited Consider again the study of the association be...
 21.27: Pregnancy In 1998, a San Diego reproductive clinic reported 42 live...
 21.28: Birthweight In 2003 the Journal of the American Medical Association...
 21.29: Political scandal! One month before the election, a poll of 630 ran...
 21.30: Shopping A survey of 430 randomly chosen adults found that 21% of t...
 21.31: Twins In 2001, one county reported that, among 3132 white women who...
 21.32: Mammograms A 9year study in Sweden compared 21,088 women who had m...
 21.33: Pain Researchers comparing the effectiveness of two pain medication...
 21.34: Gender gap Candidates for political office realize that different l...
 21.35: Food preference GfK Roper Consulting gathers information on consume...
 21.36: Fast food The global survey we learned about in Exercise 35 also as...
 21.37: Online activity checks Are more parents checking up on their teens ...
 21.38: Computer gaming Who plays online or electronic games? A survey in 2...
 21.39: NIMBY. In March 2007, the Gallup Poll split a sample of 1003 random...
 21.40: Women. The U.S. Census Bureau reports that 26% of all U.S. business...
 21.41: Skin cancer. In February 2012, MedPage Today reported that research...
 21.42: Streams. Researchers in the Adirondack Mountains collect data on a ...
Solutions for Chapter 21: Comparing Two Proportions
Full solutions for Stats Modeling the World  4th Edition
ISBN: 9780321854018
Solutions for Chapter 21: Comparing Two Proportions
Get Full SolutionsThis textbook survival guide was created for the textbook: Stats Modeling the World, edition: 4. This expansive textbook survival guide covers the following chapters and their solutions. Chapter 21: Comparing Two Proportions includes 42 full stepbystep solutions. Since 42 problems in chapter 21: Comparing Two Proportions have been answered, more than 59205 students have viewed full stepbystep solutions from this chapter. Stats Modeling the World was written by and is associated to the ISBN: 9780321854018.

Alias
In a fractional factorial experiment when certain factor effects cannot be estimated uniquely, they are said to be aliased.

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

Analysis of variance (ANOVA)
A method of decomposing the total variability in a set of observations, as measured by the sum of the squares of these observations from their average, into component sums of squares that are associated with speciic deined sources of variation

Block
In experimental design, a group of experimental units or material that is relatively homogeneous. The purpose of dividing experimental units into blocks is to produce an experimental design wherein variability within blocks is smaller than variability between blocks. This allows the factors of interest to be compared in an environment that has less variability than in an unblocked experiment.

C chart
An attribute control chart that plots the total number of defects per unit in a subgroup. Similar to a defectsperunit or U chart.

Categorical data
Data consisting of counts or observations that can be classiied into categories. The categories may be descriptive.

Center line
A horizontal line on a control chart at the value that estimates the mean of the statistic plotted on the chart. See Control chart.

Conditional probability density function
The probability density function of the conditional probability distribution of a continuous random variable.

Conditional probability mass function
The probability mass function of the conditional probability distribution of a discrete random variable.

Correlation coeficient
A dimensionless measure of the linear association between two variables, usually lying in the interval from ?1 to +1, with zero indicating the absence of correlation (but not necessarily the independence of the two variables).

Cumulative distribution function
For a random variable X, the function of X deined as PX x ( ) ? that is used to specify the probability distribution.

Curvilinear regression
An expression sometimes used for nonlinear regression models or polynomial regression models.

Degrees of freedom.
The number of independent comparisons that can be made among the elements of a sample. The term is analogous to the number of degrees of freedom for an object in a dynamic system, which is the number of independent coordinates required to determine the motion of the object.

Discrete distribution
A probability distribution for a discrete random variable

Distribution free method(s)
Any method of inference (hypothesis testing or conidence interval construction) that does not depend on the form of the underlying distribution of the observations. Sometimes called nonparametric method(s).

Error sum of squares
In analysis of variance, this is the portion of total variability that is due to the random component in the data. It is usually based on replication of observations at certain treatment combinations in the experiment. It is sometimes called the residual sum of squares, although this is really a better term to use only when the sum of squares is based on the remnants of a modelitting process and not on replication.

Error variance
The variance of an error term or component in a model.

Extra sum of squares method
A method used in regression analysis to conduct a hypothesis test for the additional contribution of one or more variables to a model.

Fractional factorial experiment
A type of factorial experiment in which not all possible treatment combinations are run. This is usually done to reduce the size of an experiment with several factors.

Frequency distribution
An arrangement of the frequencies of observations in a sample or population according to the values that the observations take on