 3.1: Hospitals The following set of data represents the number of hospit...
 3.2: Elementary and Secondary Schools These data represent the number of...
 3.3: Battery Lives Twelve batteries were tested to see how many hours th...
 3.4: SAT Scores The mean SAT math scores for selected states are represe...
 3.5: Rise in Tides Shown here is a frequency distribution for the rise i...
 3.6: Fuel Capacity The fuel capacity in gallons of 50 randomly selected ...
 3.7: Number of Cavities In a dental survey of thirdgrade students, this...
 3.8: Investment Earnings An investor calculated these percentages of eac...
 3.9: Years of Service of Employees In an advertisement, a transmission s...
 3.10: Textbooks in Professors Offices If the average number of textbooks ...
 3.11: Magazines in Bookstores A survey of bookstores showed that the aver...
 3.12: Years of Service of Supreme Court Members The number of years serve...
 3.13: NFL Salaries The salaries (in millions of dollars) for 29 NFL teams...
 3.14: Check each data set for outliers. a. 506, 511, 517, 514, 400, 521 b...
 3.15: Cost of Car Rentals A survey of car rental agencies shows that the ...
 3.16: Average Earnings of Workers The average earnings of yearround full...
 3.17: Labor Charges The average labor charge for automobile mechanics is ...
 3.18: Costs to Train Employees For a certain type of job, it costs a comp...
 3.19: Delivery Charges The average delivery charge for a refrigerator is ...
 3.20: Exam Grades Which of these exam grades has a better relative positi...
 3.21: Top Movie Sites The number of sites at which the top nine movies (b...
 3.22: Hours Worked The data shown here represent the number of hours that...
 3.23: Commuter Times The mean of the times it takes a commuter to get to ...
 3.1: When the mean is computed for individual data, all values in the da...
 3.2: The mean cannot be found for grouped data when there is an open class.
 3.3: A single, extremely large value can affect the median more than the...
 3.4: Onehalf of all the data values will fall above the mode, and oneh...
 3.5: In a data set, the mode will always be unique.
 3.6: The range and midrange are both measures of variation.
 3.7: One disadvantage of the median is that it is not unique.
 3.8: The mode and midrange are both measures of variation.
 3.9: If a persons score on an exam corresponds to the 75th percentile, t...
 3.10: What is the value of the mode when all values in the data set are d...
 3.11: When data are categorized as, for example, places of residence (rur...
 3.12: P50 corresponds to a. Q2 b. D5 c. IQR d. Midrange
 3.13: Which is not part of the fivenumber summary? a. Q1 and Q3 b. The m...
 3.14: A statistic that tells the number of standard deviations a data val...
 3.15: When a distribution is bellshaped, approximately what percentage o...
 3.16: A measure obtained from sample data is called a(n) .
 3.17: Generally, Greek letters are used to represent , and Roman letters ...
 3.18: The positive square root of the variance is called the .
 3.19: The symbol for the population standard deviation is .
 3.20: When the sum of the lowest data value and the highest data value is...
 3.21: If the mode is to the left of the median and the mean is to the rig...
 3.22: An extremely high or extremely low data value is called a(n) .
 3.23: Miles per Gallon The number of highway miles per gallon of the 10 w...
 3.24: Errors on a Typing Test The distribution of the number of errors th...
 3.25: Inches of Rain Shown here is a frequency distribution for the numbe...
 3.26: Shipment Times A survey of 36 selected recording companies showed t...
 3.27: Best Friends of Students In a survey of thirdgrade students, this ...
 3.28: Employee Years of Service In an advertisement, a retail store state...
 3.29: Newspapers for Sale The average number of newspapers for sale in an...
 3.30: Brands of Toothpaste Carried Asurvey of grocery stores showed that ...
 3.31: Test Scores A student scored 76 on a general science test where the...
 3.32: Which score has the highest relative position? a. X 12 10 s 4 b. X ...
 3.33: Sizes of Malls The number of square feet (in millions) of eight of ...
 3.34: Exam Scores On a philosophy comprehensive exam, this distribution w...
 3.35: Gas Prices for Rental Cars The first column of these data represent...
 3.36: SAT Scores The average national SAT score is 1019. If we assume a b...
 3.1: Average Cost of Weddings Averages give us information to help us to...
 3.2: Average Cost of Smoking This article states that the average yearly...
 3.3: Ages of U.S. Residents The table shows the median ages of residents...
 3.1: Business and Finance Use the data collected in data project 1 of Ch...
 3.2: Sports and Leisure Use the data collected in data project 2 of Chap...
 3.3: Technology Use the data collected in data project 3 of Chapter 2. D...
 3.4: Health and Wellness Use the data collected in data project 6 of Cha...
 3.5: Politics and Economics Use the data collected in data project 5 of ...
 3.6: Your Class Use your class as a sample. Determine the mean, median, ...
Solutions for Chapter 3: Data Description
Full solutions for Elementary Statistics: A Step by Step Approach  7th Edition
ISBN: 9780073534978
Solutions for Chapter 3: Data Description
Get Full SolutionsChapter 3: Data Description includes 68 full stepbystep solutions. This expansive textbook survival guide covers the following chapters and their solutions. Since 68 problems in chapter 3: Data Description have been answered, more than 33344 students have viewed full stepbystep solutions from this chapter. Elementary Statistics: A Step by Step Approach was written by and is associated to the ISBN: 9780073534978. This textbook survival guide was created for the textbook: Elementary Statistics: A Step by Step Approach, edition: 7.

Asymptotic relative eficiency (ARE)
Used to compare hypothesis tests. The ARE of one test relative to another is the limiting ratio of the sample sizes necessary to obtain identical error probabilities for the two procedures.

Box plot (or box and whisker plot)
A graphical display of data in which the box contains the middle 50% of the data (the interquartile range) with the median dividing it, and the whiskers extend to the smallest and largest values (or some deined lower and upper limits).

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.

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.

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

Conditional variance.
The variance of the conditional probability distribution of a random variable.

Continuous uniform random variable
A continuous random variable with range of a inite interval and a constant probability density function.

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).

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

Defect
Used in statistical quality control, a defect is a particular type of nonconformance to speciications or requirements. Sometimes defects are classiied into types, such as appearance defects and functional defects.

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

Density function
Another name for a probability density function

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

Discrete random variable
A random variable with a inite (or countably ininite) range.

Dispersion
The amount of variability exhibited by data

Distribution function
Another name for a cumulative distribution function.

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.

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.

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.

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 .