EBK UNDERSTANDING BASIC STATISTICS
8th Edition
ISBN: 8220106798706
Author: BRASE
Publisher: Cengage Learning US
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Chapter 8, Problem 13CR
Telephone Interviews: Survey The National Study of the Changing Work Force conducted an extensive survey of 2958 wage and salaried workers on issues
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Chapter 8 Solutions
EBK UNDERSTANDING BASIC STATISTICS
Ch. 8.1 - In Problems 1-8, answer true or false. Explain...Ch. 8.1 - In Problems 1-8, answer true or false. Explain...Ch. 8.1 - In Problems 1-8, answer true or false. Explain...Ch. 8.1 - In Problems 1-8, answer true or false. Explain...Ch. 8.1 - In Problems 1-8, answer true or false. Explain...Ch. 8.1 - In Problems 1-8, answer true or false. Explain...Ch. 8.1 - In Problems 1-8, answer true or false. Explain...Ch. 8.1 - In Problems 1-8, answer true or false. Explain...Ch. 8.1 - Critical Thinking Sam computed a 95% confidence...Ch. 8.1 - Critical Thinking Sam computed a 90% confidence...
Ch. 8.1 - Basic Computation: Confidence Interval Suppose x...Ch. 8.1 - Basic Computation:Confidence Interval Suppose x...Ch. 8.1 - Basic Computation: Sample Size Suppose x has a...Ch. 8.1 - Basic Computation: Sample Size Suppose x has a...Ch. 8.1 - Zoology: Hummingbirds Allen's hummingbird...Ch. 8.1 - Diagnostic Tests: Uric Acid Overproduction of uric...Ch. 8.1 - Diagnostic Tests: Plasma Volume Total plasma...Ch. 8.1 - Agriculture: Watermelon What price do farmers get...Ch. 8.1 - FBI Report: Larceny Thirty small communities in...Ch. 8.1 - Confidence Intervals: Values of A random sample...Ch. 8.1 - Confidence Intervals: Sample Size A random sample...Ch. 8.1 - Ecology: Sand Dunes At wind speeds above 1000...Ch. 8.1 - Profits: Banks Jobs and productivity! How do banks...Ch. 8.1 - Prob. 24PCh. 8.1 - Ballooning: Air Temperature How hot is the air in...Ch. 8.2 - Use Table 4 of the Appendix to find tc for a 0.95...Ch. 8.2 - Use Table 4 of the Appendix to find tc for a 0.99...Ch. 8.2 - Use Table 4 of the Appendix to find tc for a 0.90...Ch. 8.2 - Use Table 4 of the Appendix to find tc for a 0.95...Ch. 8.2 - Statistical Literacy Students t distributions are...Ch. 8.2 - Statistical Literacy As the degrees of freedom...Ch. 8.2 - Critical Thinking Consider a 90% confidence...Ch. 8.2 - Critical Thinking Consider a 90% confidence...Ch. 8.2 - Critical Thinking Lorraine computed a confidence...Ch. 8.2 - Critical Thinking Lorraine was in a hum when she...Ch. 8.2 - Basic Computation: Confidence Interval Suppose x...Ch. 8.2 - Basic Computation: Confidence Interval A random...Ch. 8.2 - In Problems 13-19. assumethat the population of x...Ch. 8.2 - In Problems 13-19. assumethat the population of x...Ch. 8.2 - In Problems 13-19. assume that the population of x...Ch. 8.2 - In Problems 13-19, assume that the population of x...Ch. 8.2 - In Problems 13-19, assume that the population of x...Ch. 8.2 - In Problems 13-19, assume that the population of x...Ch. 8.2 - 19 Critical Thinking: Boxplots and Confidence...Ch. 8.2 - Crime Rale: Denver The following data represent...Ch. 8.2 - Finance: P/E Ratio The price of a share of stock...Ch. 8.2 - 22.
Baseball: Home Run Percentage The home run...Ch. 8.2 - Expand Your knowledge: Alternate Method for...Ch. 8.3 - Statistical Literacy For a binomial experiment...Ch. 8.3 - Statistical Literacy In order to use a normal...Ch. 8.3 - Critical Thinking Results of a poll of a random...Ch. 8.3 - Critical Thinking You want to conduct a survey to...Ch. 8.3 - Critical Thinking Jerry tested 30 laptop computers...Ch. 8.3 - Critical Thinking: Brain Teaser A requirement for...Ch. 8.3 - Basic Computation: Confidence Interval for p...Ch. 8.3 - Basic Computation: Confidence Interval for p...Ch. 8.3 - Basic Computation: Sample Size What is the minimal...Ch. 8.3 - Basic Computation: Sample Size What is the minimal...Ch. 8.3 - Myers-Briggs: Actors Isabel Myers was a pioneer in...Ch. 8.3 - Myers-Briggs: Judges In a random sample of 519...Ch. 8.3 - Navajo Lifestyle: Traditional Hogans A random...Ch. 8.3 - Archaeology: Pottery Santa Fe black-on-white is a...Ch. 8.3 - Health Care: Colorado Physicians A random sample...Ch. 8.3 - Law Enforcement: Escaped Convicts Case studies...Ch. 8.3 - Fishing: Barbless Hooks In a combined study of...Ch. 8.3 - Focus Problem: Trick or Treat In a survey of a...Ch. 8.3 - Marketing: Customer Loyalty In a marketing survey,...Ch. 8.3 - Marketing: Bargain Hunters In a marketing survey,...Ch. 8.3 - Lifestyle: Smoking In a survey of 1000 large...Ch. 8.3 - Opinion Poll: Crime and Violence A NewYork...Ch. 8.3 - Medical: Blood Type A random sample of medical...Ch. 8.3 - Business: Phone Contact How hard is it to reach a...Ch. 8.3 - Campus Life: Coeds What percentage of your campus...Ch. 8.3 - Small Business: Bankruptcy The National Council of...Ch. 8.3 - Prob. 27PCh. 8.3 - Expand Your Knowledge: Plus Four Confidence...Ch. 8 - Terminology Answer true or false. The margin of...Ch. 8 - Terminology Answer true or false. A point estimate...Ch. 8 - Terminology Answer true or false. A c% confidence...Ch. 8 - Terminology Consider a student's t distribution....Ch. 8 - Statist Literacy In your own words, carefully...Ch. 8 - Critical Thinking Suppose you are told that a 95%...Ch. 8 - Critical Thinking If you have a 99% confidence...Ch. 8 - For Problems 8-12, categorize each problem...Ch. 8 - For Problems 8-12, categorize each problem...Ch. 8 - For Problems 8-12, categorize each problem...Ch. 8 - For Problems 8-12, categorize each problem...Ch. 8 - or Problems 8-12, categorize each problem...Ch. 8 - Telephone Interviews: Survey The National Study of...Ch. 8 - Telephone Interviews: Survey How large a sample is...Ch. 8 - Archaeology: Pottery Three-circle, red-on-white is...Ch. 8 - Archaeology: Pottery Consider the three-circle,...Ch. 8 - Expand Your Knowledge: Two Confidence Intervals...Ch. 8 - Garrison Bay is a small hay in Washington stale. A...Ch. 8 - Examine Figure 8-7. Fall Back " (a) Of the 1024...Ch. 8 - Examine Figure 8.-8, "Coupons: Limited Use." (a)...Ch. 8 - In this chapter, we have studied confidence...Ch. 8 - Throughout Chapter 8. we have used the normal...Ch. 8 - When the results of a survey or a poll are...
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- Suppose that you take a sample of 100 from a population that contains 45 percent Democrats. What sample size condition do you need to check here (if any)?What’s the standard error of ^P?Compare the standard errors of ^p n=100 for ,n=1000 , n=10,000, and comment.arrow_forwardSuppose that a class’s test scores have a mean of 80 and standard deviation of 5. You choose 25 students from the class. What’s the chance that the group’s average test score is more than 82?arrow_forwardSuppose that you collect data on 10 products and check their weights. The average should be 10 ounces, but your sample mean is 9 ounces with standard deviation 2 ounces. Find the standard score.What percentile is the standard score found in part a of this question closest to?Suppose that the mean really is 10 ounces. Do you find these results unusual? Use probabilities to explain.arrow_forward
- Suppose that you want to sample expensive computer chips, but you can have only n=3 of them. Should you continue the experiment?arrow_forwardSuppose that studies claim that 40 percent of cellphone owners use their phones in the car while driving. What’s the chance that more than 425 out of a random sample of 1,000 cellphone owners say they use their phones while driving?arrow_forwardSuppose that the average length of stay in Europe for American tourists is 17 days, with standard deviation 4.5. You choose a random sample of 16 American tourists. The sample of 16 stay an average of 18.5 days or more. What’s the chance of that happening?arrow_forward
- How do you recognize that a statistical problem requires you to use the CLT? Think of one or two clues you can look for. (Assume quantitative data.)arrow_forwardSuppose that you take a sample of 100 from a skewed population with mean 50 and standard deviation 15. What sample size condition do you need to check here (if any)?What’s the shape and center of the sampling distribution for ?What’s the standard error?arrow_forwardQuestion 3 The following stem-and-leaf displays the weekly salary of employees at this firm. Stem-and-Leaf Display Leaf Unit = 10.0 N=x 5 3 00123 12 4 0125888 (y) 5 11234456777 z 6 13568 5 7 154 2 8 46 i. Determine the value of x, y and z. [3] ii. What is the value of the median? [2] iii. Find the mode of this data set. iv. Calculate the range [1] [2]arrow_forward
- Let Y be a continuous RV with PDF otherwise Find the CDF, Fry), of Y . Find an expression for pth, p € (0, 1), quantile of the distribution. Find E(Y) and V(Y). Find E(-2Y + 1) and V(-3Y - 2). Find E(Y3).arrow_forwardLet X be a continuous RV with CDF Find P(X < 0), P(-1 < X < 1) and P(0.5 < X). Based on your answers to the above questions, what is the median of the distribu-tion? Why Find the PDF, fx (x), of X.arrow_forwardA survey of 581 citizens found that 313 of them favor a new bill introduced by the city. We want to find a 95% confidence interval for the true proportion of the population who favor the bill. What is the lower limit of the interval? Enter the result as a decimal rounded to 3 decimal digits. Your Answer:arrow_forward
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