- 8-3.1: In what ways is the t distribution similar to the standard normal d...
- 8-3.2: What are the degrees of freedom for the t test?
- 8-3.3: Find the critical value (or values) for the t test for each. a. n _...
- 8-3.4: (ans) Using Table F, find the P-value interval for each test value....
- 8-3.5: Veterinary Expenses of Cat Owners According to the American Pet Pro...
- 8-3.6: Park Acreage A state executive claims that the average number of ac...
- 8-3.7: Cell Phone Call Lengths The average local cell phone call length wa...
- 8-3.8: Commute Time to Work A survey of 15 large U.S. cities finds that th...
- 8-3.9: Heights of Tall Buildings A researcher estimates that the average h...
- 8-3.10: Exercise and Reading Time Spent by Men Men spend an average of 29 m...
- 8-3.11: Television Viewing by Teens Teens are reported to watch the fewest ...
- 8-3.12: Internet Visits AU.S. Web Usage Snapshot indicated a monthly averag...
- 8-3.13: Cost of Making a Movie During a recent year the average cost of mak...
- 8-3.14: Chocolate Chip Cookie Calories The average 1-ounce chocolate chip c...
- 8-3.15: Cell Phone Bills The average monthly cell phone bill was reported t...
- 8-3.16: Water Consumption The Old Farmers Almanac stated that the average c...
- 8-3.17: Doctor Visits A report by the Gallup Poll stated that on average a ...
- 8-3.18: Number of Jobs The U.S. Bureau of Labor and Statistics reported tha...
- 8-3.19: Teaching Assistants Stipends A random sample of stipends of teachin...
- 8-3.20: Average Family Size The average family size was reported as 3.18. A...
Solutions for Chapter 8-3: t Test for a Mean
Full solutions for Elementary Statistics: A Step by Step Approach 8th ed. | 8th Edition
`-error (or `-risk)
In hypothesis testing, an error incurred by rejecting a null hypothesis when it is actually true (also called a type I error).
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
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.
An estimator for a parameter obtained from a Bayesian method that uses a prior distribution for the parameter along with the conditional distribution of the data given the parameter to obtain the posterior distribution of the parameter. The estimator is obtained from the posterior distribution.
A distribution with two modes
The portion of the variability in a set of observations that is due to only random forces and which cannot be traced to speciic sources, such as operators, materials, or equipment. Also called a common cause.
Chi-square (or chi-squared) 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.
An experiment in which the treatments (experimental conditions) that are to be studied are included in the experiment. The data from the experiment are used to evaluate the treatments.
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).
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 off-diagonal elements rij are the correlations between Xi and Xj .
Formulas used to determine the number of elements in sample spaces and events.
An experiment in which the tests are planned in advance and the plans usually incorporate statistical models. See Experiment
Discrete uniform random variable
A discrete random variable with a inite range and constant probability mass function.
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).
Erlang random variable
A continuous random variable that is the sum of a ixed number of independent, exponential random variables.
Error mean square
The error sum of squares divided by its number of degrees of freedom.
A signal from a control chart when no assignable causes are present
Finite population correction factor
A term in the formula for the variance of a hypergeometric random variable.
A model that contains only irstorder terms. For example, the irst-order response surface model in two variables is y xx = + ?? ? ? 0 11 2 2 + + . A irst-order model is also called a main effects model
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.
Having trouble accessing your account? Let us help you, contact support at +1(510) 944-1054 or firstname.lastname@example.org
Forgot password? Reset it here