Concept explainers
Testing Claims About Proportions. In Exercises 9–32, test the given claim. Identify the null hypothesis, alternative hypothesis, test statistic, P-value, or critical value(s), then state the conclusion about the null hypothesis, as well as the final conclusion that addresses the original claim. Use the P-value method unless your instructor specifies otherwise. Use the
9. Mickey D’s In a study of the accuracy of fast food drive-through orders, McDonald’s had 33 orders that were not accurate among 362 orders observed (based on data from QSR magazine). Use a 0.05 significance level to test the claim that the rate of inaccurate orders is equal to 10%. Does the accuracy rate appear to be acceptable?
Learn your wayIncludes step-by-step video
Chapter 8 Solutions
Elementary Statistics (13th Edition)
Additional Math Textbook Solutions
STATS:DATA+MODELS-W/DVD
Elementary Statistics
Elementary Statistics Using Excel (6th Edition)
Introductory Statistics
Essentials of Statistics, Books a la Carte Edition (5th Edition)
- Engineering data analysis show solutionarrow_forwardChapter 5 Use the probability distribution. x P(x) 0 0.21 1 0.04 2 0.30 3 0.20 4 0.25 What is the probability x is less than 2? Find the mean and standard deviation of the probability distribution. Would P(1) be an unusual or significant outcome? Explain in 1 - 2 complete sentences.arrow_forwardExplain why the t-distribution has less spread as the number of degrees of freedom increases.arrow_forward
- Part B: Binomial Distribution Use the Binomial Distribution calculator at http://stattrek.com/online-calculator/binomial.aspx and take a screenshot for your work unless it is specified that you must use the formula. 8. From past experience it is known that 90% of one-year old children can distinguish their mother's voice from the voice of a similar sounding female. A random sample of 20 one-year olds is given this voice recognition test. a. Find the probability that at least 3 children do not recognize their mother's voice. Answer: b. Find the probability that all 20 children recognize their mother's voice. Answer:arrow_forwardComplete the table below and find the variance and standard deviation of the ff. probability distribution.arrow_forward4:59 1 chapter 5 Assessment 2 copy Chapter 5 Assessment 1. Determine whether the given values can be looked upon as the values of a probability distribution of a random variable that can take on the values 1, 2, 3, 4, and 5. Answer yes or no. If no, explain why not. a) f(1)= 0.18 f(2)= 0.20 f(3)= 0.22 f(4)= 0.23 f(5)= 0.18 2. The number of monthly breakdowns of a computer is a random variable with an average of 1.6 breakdowns per month. Find the probability that this computer will function for a month with only 1 breakdown. If 20 percent of the mice used in an experiment will become very aggressive after having been administered an experimental drug, find the probability that exactly 2 of 6 mice which have been administered the drug become very aggressive. 3. A customs inspector decides to inspect two Madrid by plane. If the selection is random and four of the shipments contain contraband, find the probability that the customs inspector will catch one of the shipments with contraband.…arrow_forward
- Part 2 Let x be a random variable that represents the batting average of a professional baseball player. Let y be a random variable that represents the percentage of strikeouts of a professional baseball player. A random sample of n = 6 professional baseball players gave the following information. x 0.338 0.306 0.340 0.248 0.367 0.269 y 3.5 7.7 4.0 8.6 3.1 11.1 Σx = 1.868, Σy = 38, Σx2 = 0.592034, Σy2 = 294.32, Σxy = 11.1556, and r ≈ -0.901. Se ≈ 1.5890, a ≈ 26.420, and b ≈ -64.517. (a) Find the predicted percentage of strikeouts for a player with an x = 0.328 batting average. (Use 2 decimal places.) %(b) Find a 90% confidence interval for y when x = 0.328. (Use 2 decimal places.) lower limit % upper limit %arrow_forwardPlease help me answerarrow_forwardyluilg O x Google y- jJpü + C Moodle English (en) 13-Applied Math-5-20202 y courses / MATH013-5-20202 / Exit Exam / Exit Exam Using the concepts of descriptive and probability, solve the following: Find the mean, median, mode and range of the following data values 2, 3, 3, 4, 6 and 7 40 Max DOarrow_forward
- MATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons IncProbability and Statistics for Engineering and th...StatisticsISBN:9781305251809Author:Jay L. DevorePublisher:Cengage LearningStatistics for The Behavioral Sciences (MindTap C...StatisticsISBN:9781305504912Author:Frederick J Gravetter, Larry B. WallnauPublisher:Cengage Learning
- Elementary Statistics: Picturing the World (7th E...StatisticsISBN:9780134683416Author:Ron Larson, Betsy FarberPublisher:PEARSONThe Basic Practice of StatisticsStatisticsISBN:9781319042578Author:David S. Moore, William I. Notz, Michael A. FlignerPublisher:W. H. FreemanIntroduction to the Practice of StatisticsStatisticsISBN:9781319013387Author:David S. Moore, George P. McCabe, Bruce A. CraigPublisher:W. H. Freeman