 8.1: High Temperatures in the United States A meteorologist claims that ...
 8.2: Travel Times to Work Based on information from the U.S. Census Bure...
 8.3: Debt of College Graduates A random sample of the average debt (in d...
 8.4: Time Until Indigestion Relief An advertisement claims that Fasto St...
 8.5: Monthly Home Rent The average monthly rent for a onebedroom home i...
 8.6: Salaries for Actuaries Nationwide, the average salary of actuaries ...
 8.7: Weights of Mens Soccer Shoes Is lighter better? A random sample of ...
 8.8: Whooping Crane Eggs Once down to about 15, the worlds only wild flo...
 8.9: Union Membership Nationwide 13.7% of employed wage and salary worke...
 8.10: Federal Prison Populations Nationally 60.2% of federal prisoners ar...
 8.11: Free School Lunches It has been reported that 59.3% of U.S. school ...
 8.12: MP3 Ownership An MP3 manufacturer claims that 65% of teenagers 13 t...
 8.13: Alcohol and Tobacco Use by High School Students The use of both alc...
 8.14: Times of Videos A film editor feels that the standard deviation for...
 8.15: Fuel Consumption The standard deviation of the fuel consumption of ...
 8.16: Movie Admission Prices The average movie admission price for a rece...
 8.17: Games Played by NBA Scoring Leaders A random sample of the number o...
 8.18: Tire Inflation To see whether people are keeping their car tires in...
 8.19: Plant Leaf Lengths A biologist knows that the average length of a l...
 8.20: Experience of Taxi Drivers A taxi company claims that its drivers h...
 8.21: Ages of Robbery Victims A recent study in a small city stated that ...
 8.22: FirstTime Marriages A magazine article stated that the average age...
 8.23: Survey on Vitamin Usage A survey in Mens Health magazine reported t...
 8.24: Breakfast Survey A dietitian read in a survey that at least 55% of ...
 8.25: Caffeinated Beverage Survey A Harris Poll found that 35% of people ...
 8.26: Radio Ownership A magazine claims that 75% of all teenage boys have...
 8.27: Find the Pvalue for the z test in Exercise 15. Pvalue _ 0.0324
 8.28: Find the Pvalue for the z test in Exercise 16. Pvalue _ 0.0001
 8.29: Pages in Romance Novels A copyeditor thinks the standard deviation ...
 8.30: Seed Germination Times It has been hypothesized that the standard d...
 8.31: Pollution Byproducts The standard deviation of the pollution bypr...
 8.32: Strength of Wrapping Cord A manufacturer claims that the standard d...
 8.33: Find the 90% confidence interval of the mean in Exercise 15. Is m c...
 8.34: Find the 95% confidence interval for the mean in Exercise 16. Is m ...
Solutions for Chapter 8: Review Execises
Full solutions for Elementary Statistics: A Step by Step Approach 8th ed.  8th Edition
ISBN: 9780073386102
Solutions for Chapter 8: Review Execises
Get Full SolutionsElementary Statistics: A Step by Step Approach 8th ed. was written by and is associated to the ISBN: 9780073386102. This textbook survival guide was created for the textbook: Elementary Statistics: A Step by Step Approach 8th ed., edition: 8. Chapter 8: Review Execises includes 34 full stepbystep solutions. Since 34 problems in chapter 8: Review Execises have been answered, more than 31486 students have viewed full stepbystep solutions from this chapter. This expansive textbook survival guide covers the following chapters and their solutions.

aerror (or arisk)
In hypothesis testing, an error incurred by failing to reject a null hypothesis when it is actually false (also called a type II error).

Assignable cause
The portion of the variability in a set of observations that can be traced to speciic causes, such as operators, materials, or equipment. Also called a special cause.

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

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.

Completely randomized design (or experiment)
A type of experimental design in which the treatments or design factors are assigned to the experimental units in a random manner. In designed experiments, a completely randomized design results from running all of the treatment combinations in random order.

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

Cook’s distance
In regression, Cook’s distance is a measure of the inluence of each individual observation on the estimates of the regression model parameters. It expresses the distance that the vector of model parameter estimates with the ith observation removed lies from the vector of model parameter estimates based on all observations. Large values of Cook’s distance indicate that the observation is inluential.

Correction factor
A term used for the quantity ( / )( ) 1 1 2 n xi i n ? = that is subtracted from xi i n 2 ? =1 to give the corrected sum of squares deined as (/ ) ( ) 1 1 2 n xx i x i n ? = i ? . The correction factor can also be written as nx 2 .

Critical value(s)
The value of a statistic corresponding to a stated signiicance level as determined from the sampling distribution. For example, if PZ z PZ ( )( .) . ? =? = 0 025 . 1 96 0 025, then z0 025 . = 1 9. 6 is the critical value of z at the 0.025 level of signiicance. Crossed factors. Another name for factors that are arranged in a factorial experiment.

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

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

Error of estimation
The difference between an estimated value and the true value.

Error propagation
An analysis of how the variance of the random variable that represents that output of a system depends on the variances of the inputs. A formula exists when the output is a linear function of the inputs and the formula is simpliied if the inputs are assumed to be independent.

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.

F distribution.
The distribution of the random variable deined as the ratio of two independent chisquare random variables, each divided by its number of degrees of freedom.

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.

Gamma function
A function used in the probability density function of a gamma random variable that can be considered to extend factorials