 4.2.45: Learning biology with computers An educator wants to compare the ef...
 4.2.46: Cell phones and brain cancer One study of cell phones and the risk ...
 4.2.47: Chocolate and happy babies A University of Helsinki (Finland) study...
 4.2.48: Child care and aggression A study of child care enrolled 1364 infan...
 4.2.49: Effects of class size Do smaller classes in elementary school reall...
 4.2.50: Effects of binge drinking A common definition of binge drinking is ...
 4.2.51: For the experiments described in Exercises 51 to 56, identify the e...
 4.2.52: For the experiments described in Exercises 51 to 56, identify the e...
 4.2.53: For the experiments described in Exercises 51 to 56, identify the e...
 4.2.54: For the experiments described in Exercises 51 to 56, identify the e...
 4.2.55: For the experiments described in Exercises 51 to 56, identify the e...
 4.2.56: For the experiments described in Exercises 51 to 56, identify the e...
 4.2.57: Cocoa and blood flow A study conducted by Norman Hollenberg, profes...
 4.2.58: Reducing unemployment Will cash bonuses speed the return to work of...
 4.2.59: Layoffs and survivor guilt Workers who survive a layoff of other em...
 4.2.60: Effects of TV advertising Figure 4.2 (page 239) displays the 6 trea...
 4.2.61: Stronger players A football coach hears that a new exercise program...
 4.2.62: Killing weeds A biologist would like to determine which of two bran...
 4.2.63: Do diets work? Dr. Linda Stern and her colleagues recruited 132 obe...
 4.2.64: The effects of day care Does day care help lowincome children stay...
 4.2.65: Headache relief Doctors identify chronic tensiontype headaches as h...
 4.2.66: More rain for California? The changing climate will probably bring ...
 4.2.67: Treating prostate disease A large study used records from Canadas n...
 4.2.68: Getting teachers to come to school Elementary schools in rural Indi...
 4.2.69: Do placebos really work? Researchers in Japan conducted an experime...
 4.2.70: Pain relief study Fizz Laboratories, a pharmaceutical company, has ...
 4.2.71: Meditation for anxiety An experiment that claimed to show that medi...
 4.2.72: Testosterone for older men As men age, their testosterone levels gr...
 4.2.73: Do diets work? Refer to Exercise 63. Subjects in the lowcarb diet ...
 4.2.74: Acupuncture and pregnancy A study sought to determine whether the a...
 4.2.75: Doctors and nurses Nursepractitioners are nurses with advanced qua...
 4.2.76: Comparing cancer treatments The progress of a type of cancer differ...
 4.2.77: In the cornfield An agriculture researcher wants to compare the yie...
 4.2.78: Comparing weightloss treatments Twenty overweight females have agr...
 4.2.79: Aw, rats! A nutrition experimenter intends to compare the weight ga...
 4.2.80: Technology for teaching statistics The Brigham Young University (BY...
 4.2.81: Look, Ma, no hands! Does talking on a handsfree cell phone distrac...
 4.2.82: Chocolate gets my heart pumping Cardiologists at Athens Medical Sch...
 4.2.83: Room temperature and dexterity An expert on worker performance is i...
 4.2.84: Carbon dioxide and tree growth The concentration of carbon dioxide ...
 4.2.85: Got deodorant? A group of students wants to perform an experiment t...
 4.2.86: Close shave Which of two brands (X or Y) of electric razor shaves c...
 4.2.87: Multiple choice: Select the best answer for Exercises 87 to 94. Can...
 4.2.88: Multiple choice: Select the best answer for Exercises 87 to 94. In ...
 4.2.89: Multiple choice: Select the best answer for Exercises 87 to 94. To ...
 4.2.90: Multiple choice: Select the best answer for Exercises 87 to 94. A g...
 4.2.91: Multiple choice: Select the best answer for Exercises 87 to 94. Cor...
 4.2.92: Multiple choice: Select the best answer for Exercises 87 to 94. A r...
 4.2.93: Multiple choice: Select the best answer for Exercises 87 to 94. A f...
 4.2.94: Multiple choice: Select the best answer for Exercises 87 to 94. Two...
 4.2.95: Seed weights (2.2) Biological measurements on the same species ofte...
 4.2.96: Twins (1.3, 3.1) A researcher studied a group of identical twins wh...
Solutions for Chapter 4.2: Experiments
Full solutions for The Practice of Statistics  5th Edition
ISBN: 9781464108730
Solutions for Chapter 4.2: Experiments
Get Full SolutionsChapter 4.2: Experiments includes 52 full stepbystep solutions. Since 52 problems in chapter 4.2: Experiments have been answered, more than 8819 students have viewed full stepbystep solutions from this chapter. The Practice of Statistics was written by and is associated to the ISBN: 9781464108730. This textbook survival guide was created for the textbook: The Practice of Statistics, edition: 5. This expansive textbook survival guide covers the following chapters and their solutions.

Attribute control chart
Any control chart for a discrete random variable. See Variables control chart.

Backward elimination
A method of variable selection in regression that begins with all of the candidate regressor variables in the model and eliminates the insigniicant regressors one at a time until only signiicant regressors remain

Bernoulli trials
Sequences of independent trials with only two outcomes, generally called “success” and “failure,” in which the probability of success remains constant.

Bimodal distribution.
A distribution with two modes

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

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

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

Consistent estimator
An estimator that converges in probability to the true value of the estimated parameter as the sample size increases.

Contrast
A linear function of treatment means with coeficients that total zero. A contrast is a summary of treatment means that is of interest in an experiment.

Correlation
In the most general usage, a measure of the interdependence among data. The concept may include more than two variables. The term is most commonly used in a narrow sense to express the relationship between quantitative variables or ranks.

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

Designed experiment
An experiment in which the tests are planned in advance and the plans usually incorporate statistical models. See Experiment

Eficiency
A concept in parameter estimation that uses the variances of different estimators; essentially, an estimator is more eficient than another estimator if it has smaller variance. When estimators are biased, the concept requires modiication.

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

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.

Fisher’s least signiicant difference (LSD) method
A series of pairwise hypothesis tests of treatment means in an experiment to determine which means differ.

Fixed factor (or fixed effect).
In analysis of variance, a factor or effect is considered ixed if all the levels of interest for that factor are included in the experiment. Conclusions are then valid about this set of levels only, although when the factor is quantitative, it is customary to it a model to the data for interpolating between these levels.

Generating function
A function that is used to determine properties of the probability distribution of a random variable. See Momentgenerating function

Goodness of fit
In general, the agreement of a set of observed values and a set of theoretical values that depend on some hypothesis. The term is often used in itting a theoretical distribution to a set of observations.

Hat matrix.
In multiple regression, the matrix H XXX X = ( ) ? ? 1 . This a projection matrix that maps the vector of observed response values into a vector of itted values by yˆ = = X X X X y Hy ( ) ? ? ?1 .
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