 6.1: Before answering any questions about the correlation, what would yo...
 6.2: If she adds 10 points to each Exam 1 score, how will this change th...
 6.3: If she standardizes scores on each exam, how will this affect the c...
 6.4: In general, if someone did poorly on Exam 1, are they likely to hav...
 6.5: If someone did poorly on Exam 1, can you be sure that they did poor...
 6.6: Disk drives Disk drives have been getting larger. Their capacity is...
 6.7: Performance IQ scores vs. brain size A study examined brain size (m...
 6.8: Kentucky Derby 2011 The fastest horse in Kentucky Derby history was...
 6.9: Correlation facts If we assume that the conditions for correlation ...
 6.10: Correlation facts II If we assume that the conditions for correlati...
 6.11: Bookstore sales again A larger firm is considering acquiring the bo...
 6.12: Blizzards A study finds that during blizzards, online sales are hig...
 6.13: Firing pottery A ceramics factory can fire eight large batches of p...
 6.14: Coffee sales Owners of a new coffee shop tracked sales for the firs...
 6.15: Matching Here are several scatterplots. The calculated correlations...
 6.16: Matching Here and on the next page are several scatterplots. The ca...
 6.17: Politics A candidate for office claims that there is a correlation ...
 6.18: Car thefts The National Insurance Crime Bureau reports that Honda A...
 6.19: Roller coasters Roller coasters get all their speed by dropping dow...
 6.20: Antidepressants A study compared the effectiveness of several antid...
 6.21: Hard water In a study of streams in the Adirondack Mountains, the f...
 6.22: Traffic headaches A study of traffic delays in 68 U.S. cities found...
 6.23: Cold nights Is there an association between time of year and the ni...
 6.24: Association A researcher investigating the association between two ...
 6.25: Prediction units The errors in predicting hurricane tracks (examine...
 6.26: More predictions Hurricane Katrinas hurricane force winds extended ...
 6.27: Firing pottery A ceramics factory can fire eight large batches of p...
 6.28: Correlation errors Your Economics instructor assigns your class to ...
 6.29: More correlation errors Students in the Economics class discussed i...
 6.30: Height and reading A researcher studies children in elementary scho...
 6.31: Correlation conclusions I The correlation between Age and Income as...
 6.32: Correlation conclusions II The correlation between Fuel Efficiency ...
 6.33: Correlation conclusions II The correlation between Fuel Efficiency ...
 6.34: Baldness and heart disease Medical researchers followed 1435 middle...
 6.35: Sample survey A polling organization is checking its database to se...
 6.36: Interest rates and mortgages Since 1985, average mortgage interest ...
 6.37: Income and housing The Office of Federal Housing Enterprise Oversig...
 6.38: Fuel economy 2010 Here are advertised horsepower ratings and expect...
 6.39: Drug abuse A survey was conducted in the United States and 10 count...
 6.40: Burgers Fast food is often considered unhealthy because much of it ...
 6.41: Burgers II In the previous exercise you analyzed the association be...
Solutions for Chapter 6: Scatterplots, Association, and Correlation
Full solutions for Stats Modeling the World  4th Edition
ISBN: 9780321854018
Solutions for Chapter 6: Scatterplots, Association, and Correlation
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 6: Scatterplots, Association, and Correlation includes 41 full stepbystep solutions. Stats Modeling the World was written by and is associated to the ISBN: 9780321854018. Since 41 problems in chapter 6: Scatterplots, Association, and Correlation have been answered, more than 19799 students have viewed full stepbystep solutions from this chapter.

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

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

Bimodal distribution.
A distribution with two modes

Bivariate normal distribution
The joint distribution of two normal random variables

Causeandeffect diagram
A chart used to organize the various potential causes of a problem. Also called a ishbone diagram.

Central tendency
The tendency of data to cluster around some value. Central tendency is usually expressed by a measure of location such as the mean, median, or mode.

Coeficient of determination
See R 2 .

Conditional probability
The probability of an event given that the random experiment produces an outcome in another event.

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

Continuous distribution
A probability distribution for a continuous random variable.

Convolution
A method to derive the probability density function of the sum of two independent random variables from an integral (or sum) of probability density (or mass) functions.

Correlation matrix
A square matrix that contains the correlations among a set of random variables, say, XX X 1 2 k , ,…, . The main diagonal elements of the matrix are unity and the offdiagonal elements rij are the correlations between Xi and Xj .

Covariance
A measure of association between two random variables obtained as the expected value of the product of the two random variables around their means; that is, Cov(X Y, ) [( )( )] =? ? E X Y ? ? X Y .

Critical region
In hypothesis testing, this is the portion of the sample space of a test statistic that will lead to rejection of the null hypothesis.

Deining relation
A subset of effects in a fractional factorial design that deine the aliases in the design.

Deming’s 14 points.
A management philosophy promoted by W. Edwards Deming that emphasizes the importance of change and quality

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).

Finite population correction factor
A term in the formula for the variance of a hypergeometric random variable.

Fraction defective
In statistical quality control, that portion of a number of units or the output of a process that is defective.

Gaussian distribution
Another name for the normal distribution, based on the strong connection of Karl F. Gauss to the normal distribution; often used in physics and electrical engineering applications