Applied Statistics in Business and Economics

5th Edition

ISBN: 9780077837303

Author: David Doane, Lori Seward Senior Instructor of Operations Management

Publisher: McGraw-Hill Education

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calcul…

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Chapter 4, Problem 60CE

SAT scores for the entering class of 2010 at Oxnard University were normally distributed with a mean of 1340 and a standard deviation of 90. Bob’s SAT score was 1430. (a) Find Bob’s standardized z-score. (b) By the Empirical Rule, is Bob’s SAT score unusual?

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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Chapter 4, Problem 59CE

Chapter 4, Problem 61CE

Chapter 4 Solutions

Applied Statistics in Business and Economics

Ch. 4.2 - Prob. 1SE Ch. 4.2 - For each data set, is the mode a good measure of...Ch. 4.2 - For each data set, is the mode a good measure of...Ch. 4.2 - For each data set, which best indicates a typical...Ch. 4.2 - For each data set, which best indicates a typical...Ch. 4.2 - Days on the market are shown for the 36 most...Ch. 4.2 - Scores are shown for the most recent state civil...Ch. 4.2 - Prob. 8SE Ch. 4.2 - CitiBank recorded the number of customers to use a...Ch. 4.2 - Prob. 10SE

Ch. 4.2 - Prob. 11SE Ch. 4.2 - Prob. 12SE Ch. 4.2 - (a) Write the Excel function for the 10 percent...Ch. 4.2 - Prob. 14SE Ch. 4.2 - Prob. 15SE Ch. 4.2 - Spirit Airlines kept track of the number of empty...Ch. 4.2 - CitiBank recorded the number of customers to use a...Ch. 4.2 - On Friday night, the owner of Chez Pierre in...Ch. 4.2 - Prob. 19SE Ch. 4.2 - Prob. 20SE Ch. 4.3 - (a) Find the mean and standard deviation for each...Ch. 4.3 - For each data set: (a) Find the mean. (b) Find the...Ch. 4.3 - In fuel economy tests in city driving conditions,...Ch. 4.3 - Over the past month, Bobs bowling score mean was...Ch. 4.3 - Prob. 25SE Ch. 4.3 - Prob. 26SE Ch. 4.3 - (a) Find the coefficient of variation for prices...Ch. 4.3 - Prob. 28SE Ch. 4.3 - Noodles and Company tested consumer reaction to...Ch. 4.4 - (a) By Chebyshevs Theorem, at least how many...Ch. 4.4 - An exam has a mean of 70 with a standard deviation...Ch. 4.4 - Prob. 32SE Ch. 4.4 - The mean collection period for accounts receivable...Ch. 4.4 - Prob. 34SE Ch. 4.4 - Prob. 35SE Ch. 4.4 - Prob. 36SE Ch. 4.4 - Find the original data value corresponding to each...Ch. 4.4 - CitiBank recorded the number of customers to use a...Ch. 4.4 - Prob. 39SE Ch. 4.5 - Scores on an accounting exam ranged from 42 to 96,...Ch. 4.5 - In 2007, total compensation (in thousands of...Ch. 4.5 - Waiting times (minutes) for a table at Joeys BBQ...Ch. 4.5 - Coffee temperatures (degrees Fahrenheit) at a...Ch. 4.5 - Prob. 44SE Ch. 4.5 - On San Martin Boulevard, embedded sensors kept...Ch. 4.5 - Prob. 46SE Ch. 4.5 - Prob. 47SE Ch. 4.6 - For each X-Y data set (n = 12): (a) Make a scatter...Ch. 4.6 - Your laptop gets warm (even hot) when you place it...Ch. 4.6 - Prob. 50SE Ch. 4.6 - Prob. 51SE Ch. 4.7 - Estimate the mean from this table of grouped data...Ch. 4.7 - Estimate the mean from the following table of...Ch. 4 - What are descriptive statistics? How do they...Ch. 4 - Explain each concept: (a) center, (b) variability,...Ch. 4 - Prob. 3CR Ch. 4 - List strengths and weaknesses of each measure of...Ch. 4 - Prob. 5CR Ch. 4 - (a) What is a bimodal distribution? (b) Explain...Ch. 4 - Prob. 7CR Ch. 4 - Prob. 8CR Ch. 4 - (a) Which standard deviation formula (population,...Ch. 4 - (a) To what kind of data does Chebyshevs Theorem...Ch. 4 - Prob. 11CR Ch. 4 - Prob. 12CR Ch. 4 - Prob. 13CR Ch. 4 - Prob. 14CR Ch. 4 - (a) Explain the method of medians for calculating...Ch. 4 - (a) What is a box plot? What does it tell us? (b)...Ch. 4 - Prob. 17CR Ch. 4 - Prob. 18CR Ch. 4 - Prob. 19CR Ch. 4 - (a) What is kurtosis? (b) Sketch a platykurtic...Ch. 4 - Prob. 54CE Ch. 4 - If the mean asset turnover for retail firms is...Ch. 4 - Prob. 56CE Ch. 4 - During a rock concert, the noise level (in...Ch. 4 - Bags of jelly beans have a mean weight of 396 gm...Ch. 4 - Based on experience, the Ball Corporations...Ch. 4 - SAT scores for the entering class of 2010 at...Ch. 4 - Prob. 61CE Ch. 4 - The average time a Boulder High varsity lacrosse...Ch. 4 - Prob. 63CE Ch. 4 - Below are monthly rents paid by 30 students who...Ch. 4 - How many days in advance do travelers purchase...Ch. 4 - The durations (minutes) of 26 electric power...Ch. 4 - The U.S. Postal Service will ship a Priority Mail...Ch. 4 - Prob. 68CE Ch. 4 - Prob. 69CE Ch. 4 - Prob. 70CE Ch. 4 - Prob. 71CE Ch. 4 - A plumbing suppliers mean monthly demand for vinyl...Ch. 4 - Prob. 73CE Ch. 4 - Prob. 74CE Ch. 4 - Prob. 75CE Ch. 4 - Caffeine content in a 5-ounce cup of brewed coffee...Ch. 4 - Prob. 77CE Ch. 4 - Prob. 78CE Ch. 4 - Prob. 79CE Ch. 4 - Prob. 80CE Ch. 4 - Prob. 81CE Ch. 4 - The median waiting time for a liver transplant in...Ch. 4 - A small suburban community agreed to purchase...Ch. 4 - A companys contractual trigger point for a union...Ch. 4 - Prob. 85CE Ch. 4 - (a) Enter the Excel function...Ch. 4 - Note: In each of the following tables, the upper...Ch. 4 - Prob. 88CE Ch. 4 - The self-reported number of hours worked per week...Ch. 4 - How long does it take to fly from Denver to...Ch. 4 - (a) Make an Excel scatter plot of X = 1990 assault...Ch. 4 - (a) Make an Excel scatter plot of X = airspeed...Ch. 4 - Prob. 95CE Ch. 4 - Prob. 1ERQ Ch. 4 - Which is not an ethical obligation of a...Ch. 4 - Prob. 3ERQ Ch. 4 - Prob. 4ERQ Ch. 4 - Give the type of measurement (nominal, ordinal,...Ch. 4 - Prob. 6ERQ Ch. 4 - To choose a sample of 12 students from a...Ch. 4 - Which of the following is not a reason for...Ch. 4 - Which statement is correct? Why not the others? a....Ch. 4 - Prob. 10ERQ Ch. 4 - The management of a theme park obtained a random...Ch. 4 - Which one of the following is true? Why not the...Ch. 4 - Prob. 13ERQ Ch. 4 - Prob. 14ERQ Ch. 4 - Here are the ages of a random sample of 20 CEOs...Ch. 4 - Prob. 16ERQ Ch. 4 - Prob. 17ERQ Ch. 4 - Prob. 18ERQ Ch. 4 - Which is not a characteristic of using a log scale...

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Statistics 4.1 Introduction to Inferential Statistics; Author: Dr. Jack L. Jackson II;https://www.youtube.com/watch?v=QLo4TEvBvK4;License: Standard YouTube License, CC-BY

SAT scores for the entering class of 2010 at Oxnard University were normally distributed with a mean of 1340 and a standard deviation of 90. Bob’s SAT score was 1430. (a) Find Bob’s standardized z -score. (b) By the Empirical Rule , is Bob’s SAT score unusual?

Solution Summary: The author calculates the Bob's standardized z -score for SAT scores by using the Empirical Rule.

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Chapter 4 Solutions