EP INTRODUCTORY STATISTICS-MYSTATLAB
3rd Edition
ISBN: 9780135190210
Author: Gould
Publisher: PEARSON CO
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Chapter 6, Problem 52SE
Men’s Heights Suppose college men’s heights are approximately
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The average miles per gallon for a sample of 40 cars of model SX last year was 32.1, with a population standard deviation of 3.8. A sample of 40 cars from this year’s model SX has an average of 35.2 mpg, with a population standard deviation of 5.4.
Find a 99 percent confidence interval for the difference in average mpg for this car brand (this year’s model minus last year’s).Find a 99 percent confidence interval for the difference in average mpg for last year’s model minus this year’s. What does the negative difference mean?
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Find an 80 percent confidence interval for the percentage of all U.S. college students who drive a used car.What sample size would cut this margin of error in half?
Chapter 6 Solutions
EP INTRODUCTORY STATISTICS-MYSTATLAB
Ch. 6 - Directions Determine whether each of the following...Ch. 6 - 6.1-6.4 Directions Determine whether each of the...Ch. 6 - 6.1-6.4 Directions Determine whether each of the...Ch. 6 - 6.1-6.4 Directions Determine whether each of the...Ch. 6 - Loaded Die (Example 2) A magician has shaved an...Ch. 6 - Prob. 6SECh. 6 - Distribution of Two Thumbtacks When a certain type...Ch. 6 - Two Children Make a list of all possible outcomes...Ch. 6 - Two Thumbtacks a. From your answers in Exercise...Ch. 6 - Two Children Using your list of outcomes in...
Ch. 6 - Snow Depth (Example 3) Eric wants to go skiing...Ch. 6 - Snow Depth Refer to Exercise 6.11. What is the...Ch. 6 - Applying the Empirical Rule with z-Scores The...Ch. 6 - Length of Pregnancy Assume that the lengths of...Ch. 6 - SAT Scores Quantitative SAT scores are...Ch. 6 - Women’s Heights Assume that college women’s...Ch. 6 - Women’s Heights (Example 4) Assume college women’s...Ch. 6 - SAT Scores Quantitative SAT scores are...Ch. 6 - Standard Normal Use the table or technology to...Ch. 6 - Standard Normal Use the table or technology to...Ch. 6 - Standard Normal Use technology or a Normal table...Ch. 6 - Standard Normal Use technology or a Normal table...Ch. 6 - Extreme Positive z -Scores For each question, find...Ch. 6 - Extreme Negative z-Scores For each question, find...Ch. 6 - St. Bernard Dogs (Example 5) According to dogtime...Ch. 6 - Whales Whales have one of the longest gestation...Ch. 6 - Boys’ Foot Length (Example 6) According to the...Ch. 6 - Women’s Foot Length According to the Digital Human...Ch. 6 - Boys’ Foot Length Suppose a shoe store stocks...Ch. 6 - Women’s Foot Length Suppose a shoe store stocks...Ch. 6 - Birth Weights (Example 7) According to the British...Ch. 6 - Birth Lengths According to National Vital...Ch. 6 - White Blood Cells The distribution of white blood...Ch. 6 - Red Blood Cells The distribution of red blood cell...Ch. 6 - SAT Scores in Illinois According to the 2017 SAT...Ch. 6 - SAT Scores in Florida According to the 2017 SAT...Ch. 6 - Arm Span (Men) According to Anthropometric Survey...Ch. 6 - Arm Span (Women) According to Anthropometric...Ch. 6 - New York City Weather New York City’s mean minimum...Ch. 6 - Chicago Weather The average winter daily...Ch. 6 - Probability or Measurement (Inverse)? (Example 8)...Ch. 6 - Probability or Measurement (Inverse)? The Normal...Ch. 6 - Inverse Normal, Standard In a standard Normal...Ch. 6 - Inverse Normal, Standard In a standard Normal...Ch. 6 - Inverse Normal, Standard Assume a standard Normal...Ch. 6 - Inverse Normal, Standard Assume a standard Normal...Ch. 6 - Prob. 47SECh. 6 - Weights of Newborn Hippos The weight of newborn...Ch. 6 - Medical School MCAT Scores on the 2017 MCAT, an...Ch. 6 - Medical School GPA The distribution of grade point...Ch. 6 - Women’s Heights Suppose college women’s heights...Ch. 6 - Men’s Heights Suppose college men’s heights are...Ch. 6 - Inverse SATs Critical reading SAT scores are...Ch. 6 - Inverse Women’s Heights College women have heights...Ch. 6 - Girls’ and Women’s Heights According to the...Ch. 6 - Boys’ and Men’s Heights According to the National...Ch. 6 - Cats’ Birth Weights The average birth weight of...Ch. 6 - Elephants’ Birth Weights The average birth weight...Ch. 6 - Gender of Children (Example 10) A married couple...Ch. 6 - Coin Flip A coin will be flipped four times, and...Ch. 6 - Rolling a Die (Example 11) A die is rolled 5...Ch. 6 - Twins In Exercise 6.59 you are told to assume that...Ch. 6 - Free Throws Professional basketball player...Ch. 6 - On-Time Arrivals Alaska Airlines has an on-time...Ch. 6 - Identifying n,p, and x (Example 12) For each...Ch. 6 - Identifying n,p, and x For each situation,...Ch. 6 - Dog Owners (Example 13) According to the American...Ch. 6 - Cat Owners According to the American Veterinary...Ch. 6 - Passports According to data from the U.S. State...Ch. 6 - Travel According to a survey conducted by OnePoll,...Ch. 6 - Wisconsin Graduation Wisconsin has the highest...Ch. 6 - Colorado Graduation Colorado has a high school...Ch. 6 - Cell Phones According to the Centers of Disease...Ch. 6 - Landlines According to the Centers of Disease...Ch. 6 - Drones (Example 14) The use of drones, aircraft...Ch. 6 - Drones A 2017 Pew Research Center report on drones...Ch. 6 - Texting While Walking According to a report by the...Ch. 6 - Texting While Driving According to a study by the...Ch. 6 - Prob. 79SECh. 6 - Free Throws Professional basketball LeBron James...Ch. 6 - Prob. 81SECh. 6 - Prob. 82SECh. 6 - Discrete or Continuous? Determine whether each of...Ch. 6 - Probability Distribution In a game of chance,...Ch. 6 - Birth Length A study of U.S. births published on...Ch. 6 - Birth Length A study of U.S. births published on...Ch. 6 - Males’ Body Temperatures A study of human body...Ch. 6 - Females’ Body Temperatures A study of human body...Ch. 6 - Prob. 89CRECh. 6 - Medical Licensing See problem 6.89 for information...Ch. 6 - Systolic Blood Pressures Systolic blood pressures...Ch. 6 - Prob. 92CRECh. 6 - Stress According to a 2017 Gallup poll, 44#37; of...Ch. 6 - Stress According to a 2017 Gallup poll, 17 of...Ch. 6 - Voice-Controlled Assistants Voice-controlled video...Ch. 6 - Prob. 96CRECh. 6 - Prob. 97CRECh. 6 - Prob. 98CRECh. 6 - Prob. 99CRECh. 6 - Quantitative SAT Scores, Normal and Binomial The...Ch. 6 - Prob. 101CRECh. 6 - Birth Length and z-Scores, Inverse Babies in the...
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- You want to compare the average number of tines on the antlers of male deer in two nearby metro parks. A sample of 30 deer from the first park shows an average of 5 tines with a population standard deviation of 3. A sample of 35 deer from the second park shows an average of 6 tines with a population standard deviation of 3.2. Find a 95 percent confidence interval for the difference in average number of tines for all male deer in the two metro parks (second park minus first park).Do the parks’ deer populations differ in average size of deer antlers?arrow_forwardSuppose that you want to increase the confidence level of a particular confidence interval from 80 percent to 95 percent without changing the width of the confidence interval. Can you do it?arrow_forwardA random sample of 1,117 U.S. college students finds that 729 go home at least once each term. Find a 98 percent confidence interval for the proportion of all U.S. college students who go home at least once each term.arrow_forward
- Suppose that you make two confidence intervals with the same data set — one with a 95 percent confidence level and the other with a 99.7 percent confidence level. Which interval is wider?Is a wide confidence interval a good thing?arrow_forwardIs it true that a 95 percent confidence interval means you’re 95 percent confident that the sample statistic is in the interval?arrow_forwardTines can range from 2 to upwards of 50 or more on a male deer. You want to estimate the average number of tines on the antlers of male deer in a nearby metro park. A sample of 30 deer has an average of 5 tines, with a population standard deviation of 3. Find a 95 percent confidence interval for the average number of tines for all male deer in this metro park.Find a 98 percent confidence interval for the average number of tines for all male deer in this metro park.arrow_forward
- Based on a sample of 100 participants, the average weight loss the first month under a new (competing) weight-loss plan is 11.4 pounds with a population standard deviation of 5.1 pounds. The average weight loss for the first month for 100 people on the old (standard) weight-loss plan is 12.8 pounds, with population standard deviation of 4.8 pounds. Find a 90 percent confidence interval for the difference in weight loss for the two plans( old minus new) Whats the margin of error for your calculated confidence interval?arrow_forwardA 95 percent confidence interval for the average miles per gallon for all cars of a certain type is 32.1, plus or minus 1.8. The interval is based on a sample of 40 randomly selected cars. What units represent the margin of error?Suppose that you want to decrease the margin of error, but you want to keep 95 percent confidence. What should you do?arrow_forward3. (i) Below is the R code for performing a X2 test on a 2×3 matrix of categorical variables called TestMatrix: chisq.test(Test Matrix) (a) Assuming we have a significant result for this procedure, provide the R code (including any required packages) for an appropriate post hoc test. (b) If we were to apply this technique to a 2 × 2 case, how would we adapt the code in order to perform the correct test? (ii) What procedure can we use if we want to test for association when we have ordinal variables? What code do we use in R to do this? What package does this command belong to? (iii) The following code contains the initial steps for a scenario where we are looking to investigate the relationship between age and whether someone owns a car by using frequencies. There are two issues with the code - please state these. Row3<-c(75,15) Row4<-c(50,-10) MortgageMatrix<-matrix(c(Row1, Row4), byrow=T, nrow=2, MortgageMatrix dimnames=list(c("Yes", "No"), c("40 or older","<40")))…arrow_forward
- Describe the situation in which Fisher’s exact test would be used?(ii) When do we use Yates’ continuity correction (with respect to contingencytables)?[2 Marks] 2. Investigate, checking the relevant assumptions, whether there is an associationbetween age group and home ownership based on the sample dataset for atown below:Home Owner: Yes NoUnder 40 39 12140 and over 181 59Calculate and evaluate the effect size.arrow_forwardNot use ai pleasearrow_forwardNeed help with the following statistic problems.arrow_forward
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