- 7-3.1: In each case, find and . a. n _ 80 and X _ 40 0.5, 0.5 b. n _ 200 a...
- 7-3.2: (ans) Find and for each percentage. (Use each percentage for .) a. ...
- 7-3.3: Vacations A U.S. Travel Data Center survey conducted for Better Hom...
- 7-3.4: Regular Voters in America Thirty-five percent of adult Americans ar...
- 7-3.5: Private Schools The proportion of students in private schools is ar...
- 7-3.6: Belief in Haunted Places A random sample of 205 college students we...
- 7-3.7: Work Interruptions Asurvey found that out of 200 workers, 168 said ...
- 7-3.8: Travel to Outer Space ACBS News/New York Times poll found that 329 ...
- 7-3.9: High School Graduates Who Take the SAT The national average for the...
- 7-3.10: Educational Television In a sample of 200 people, 154 said that the...
- 7-3.11: Fruit Consumption Anutritionist found that in a sample of 80 famili...
- 7-3.12: Students Who Major in Business It has been reported that 20.4% of i...
- 7-3.13: Financial Well-being In a Gallup Poll of 1005 individuals, 452 thou...
- 7-3.14: Fighting U.S. Hunger In a poll of 1000 likely voters, 560 say that ...
- 7-3.15: Overseas Travel Aresearcher wishes to be 95% confident that her est...
- 7-3.16: Widows A recent study indicated that 29% of the 100 women over age ...
- 7-3.17: Direct Satellite Television It is believed that 25% of U.S. homes h...
- 7-3.18: Obesity Obesity is defined as a body mass index (BMI) of 30 kg/m2 o...
- 7-3.19: Unmarried Americans Nearly one-half of Americans aged 25 to 29 are ...
- 7-3.20: Diet Habits A federal report indicated that 27% of children ages 2 ...
- 7-3.21: Gun Control If a sample of 600 people is selected and the researche...
- 7-3.22: Survey on Politics In a study, 68% of 1015 adults said that they be...
Solutions for Chapter 7-3: Confidence Intervals and Sample Size for Proportions
Full solutions for Elementary Statistics: A Step by Step Approach 8th ed. | 8th Edition
Attribute control chart
Any control chart for a discrete random variable. See Variables control chart.
Bivariate normal distribution
The joint distribution of two normal random variables
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).
A tabular arrangement expressing the assignment of members of a data set according to two or more categories or classiication criteria
A measure of association between two random variables obtained as the expected value of the product of the two random variables around their means; that is, Cov(X Y, ) [( )( )] =? ? E X Y ? ? X Y .
Deming’s 14 points.
A management philosophy promoted by W. Edwards Deming that emphasizes the importance of change and quality
Another name for a probability density function
The response variable in regression or a designed experiment.
A matrix that provides the tests that are to be conducted in an experiment.
An experiment in which the tests are planned in advance and the plans usually incorporate statistical models. See Experiment
A probability distribution for a discrete random variable
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.
Error mean square
The error sum of squares divided by its number of degrees of freedom.
The variance of an error term or component in a model.
A subset of a sample space.
Finite population correction factor
A term in the formula for the variance of a hypergeometric random variable.
In statistical quality control, that portion of a number of units or the output of a process that is defective.
Fraction defective control chart
See P chart
Geometric random variable
A discrete random variable that is the number of Bernoulli trials until a success occurs.