 24.1: 1. Dogs and calories. In July 2007, Consumer Reports examined the c...
 24.2: 2. Dogs and sodium. The Consumer Reports article described in Exerc...
 24.3: 3. Dogs and fat. The Consumer Reports article described inExercise ...
 24.4: 4. Washers. In June 2007, Consumer Reports examined toploadingand f...
 24.5: 5. Dogs and fat, second helping. In Exercise 3, wesaw a 90% confide...
 24.6: 6. Second load of wash. In Exercise 4, we saw a 98% confidenceinter...
 24.7: 7. Learning math. The Core Plus Mathematics Project(CPMP) is an inn...
 24.8: 8. Stereograms. Stereograms appear to be composed entirelyof random...
 24.9: 9. CPMP, again. During the study described in Exercise7, students i...
 24.10: 10. CPMP and word problems. The study of the newCPMP Mathematics me...
 24.11: 11. Commuting. A man who moves to a new city sees thatthere are two...
 24.12: 12. Pulse rates. A researcher wanted to see whether thereis a signi...
 24.13: 13. Cereal. The data below show the sugar content (as a percentageo...
 24.14: 14. Egyptians. Some archaeologists theorize that ancientEgyptians i...
 24.15: 15. Reading. An educator believes that new reading activitiesfor el...
 24.16: 16. Streams. Researchers collected samples of water fromstreams in ...
 24.17: 17. Baseball 2006. American League baseball teams playtheir games w...
 24.18: 18. Handy. Afactory hiring people to work on an assemblyline gives ...
 24.19: 19. Double header 2006. Do the data in Exercise 17 suggestthat the ...
 24.20: 20. Hard water. In an investigation of environmentalcauses of disea...
 24.21: 21. Job satisfaction. Acompany institutes an exercise breakfor its ...
 24.22: 22. Summer school. Having done poorly on their mathfinal exams in J...
 24.23: 23. Sex and violence. In June 2002, the Journal of AppliedPsycholog...
 24.24: 24. Ad campaign. You are a consultant to the marketingdepartment of...
 24.25: 25. Sex and violence II. In the study described in Exercise23, the ...
 24.26: 26. Ad recall. In Exercises 23 and 25, we see the numberof advertis...
 24.27: 27. Hungry? Researchers investigated how the size of abowl affects ...
 24.28: 28. Thirsty? Researchers randomly assigned participantseither a tal...
 24.29: 29. Lower scores? Newspaper headlines recently announceda decline i...
 24.30: 30. The Internet. The NAEP report described in Exercise29 compared ...
 24.31: 31. Running heats. In Olympic running events, preliminaryheats are ...
 24.32: 32. Swimming heats. In Exercise 31 we looked at thetimes in two dif...
 24.33: 33. Tees. Does it matter what kind of tee a golfer places theball o...
 24.34: 34. Golf again. Given the test results on golf tees describedin Exe...
 24.35: 35. Crossing Ontario. Between 1954 and 2003, swimmershave crossed L...
 24.36: 36. Music and memory. Is it a good idea to listen to musicwhen stud...
 24.37: 37. Rap. Using the results of the experiment described inExercise 3...
 24.38: 38. Cuckoos. Cuckoos lay their eggs in the nests of other(host) bir...
Solutions for Chapter 24: ComparingMeans
Full solutions for Stats: Modeling The World  3rd Edition
ISBN: 9780131359581
Solutions for Chapter 24: ComparingMeans
Get Full SolutionsChapter 24: ComparingMeans includes 38 full stepbystep solutions. This textbook survival guide was created for the textbook: Stats: Modeling The World , edition: 3. This expansive textbook survival guide covers the following chapters and their solutions. Since 38 problems in chapter 24: ComparingMeans have been answered, more than 28245 students have viewed full stepbystep solutions from this chapter. Stats: Modeling The World was written by and is associated to the ISBN: 9780131359581.

2 k factorial experiment.
A full factorial experiment with k factors and all factors tested at only two levels (settings) each.

Additivity property of x 2
If two independent random variables X1 and X2 are distributed as chisquare with v1 and v2 degrees of freedom, respectively, Y = + X X 1 2 is a chisquare random variable with u = + v v 1 2 degrees of freedom. This generalizes to any number of independent chisquare random variables.

All possible (subsets) regressions
A method of variable selection in regression that examines all possible subsets of the candidate regressor variables. Eficient computer algorithms have been developed for implementing all possible regressions

Arithmetic mean
The arithmetic mean of a set of numbers x1 , x2 ,…, xn is their sum divided by the number of observations, or ( / )1 1 n xi t n ? = . The arithmetic mean is usually denoted by x , and is often called the average

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.

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.

Combination.
A subset selected without replacement from a set used to determine the number of outcomes in events and sample spaces.

Conidence interval
If it is possible to write a probability statement of the form PL U ( ) ? ? ? ? = ?1 where L and U are functions of only the sample data and ? is a parameter, then the interval between L and U is called a conidence interval (or a 100 1( )% ? ? conidence interval). The interpretation is that a statement that the parameter ? lies in this interval will be true 100 1( )% ? ? of the times that such a statement is made

Control limits
See Control chart.

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.

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.

Cumulative sum control chart (CUSUM)
A control chart in which the point plotted at time t is the sum of the measured deviations from target for all statistics up to time t

Defectsperunit control chart
See U chart

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).

Distribution function
Another name for a cumulative distribution function.

Enumerative study
A study in which a sample from a population is used to make inference to the population. See Analytic study

Error mean square
The error sum of squares divided by its number of degrees of freedom.

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.