Introductory Statistics
1st Edition
ISBN: 9781938168208
Author: Barbara Illowsky, Susan Dean
Publisher: OpenStax College
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Textbook Question
Chapter 2, Problem 13P
What does the frequency column in Table 2.42 sum to? Why?
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In order to find probability, you can use this formula in Microsoft Excel:
The best way to understand and solve these problems is by first drawing a bell curve and marking key points such as x, the mean, and the areas of interest. Once marked on the bell curve, figure out what calculations are needed to find the area of interest.
=NORM.DIST(x, Mean, Standard Dev., TRUE).
When the question mentions “greater than” you may have to subtract your answer from 1.
When the question mentions “between (two values)”, you need to do separate calculation for both values and then subtract their results to get the answer.
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Compute the probability of a value between 44.0 and 55.0.
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In the third step, subtract the answer of the first part from the…
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Problem 1:
The mean hourly pay of an American Airlines flight attendant is normally distributed with a mean of 40 per hour and a standard deviation of 3.00 per hour. What is the probability that the hourly pay of a randomly selected flight attendant is:
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The mean of a normal probability distribution is 400 pounds. The standard deviation is 10 pounds.
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Problem 3:
In New York State, the mean salary for high school teachers in 2022 was 81,410 with a standard deviation of 9,500. Only Alaska’s mean salary was higher. Assume New York’s state salaries follow a normal distribution.
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Chapter 2 Solutions
Introductory Statistics
Ch. 2 - For the Park City basketball team, scores for the...Ch. 2 - The following data show the distances (in miles)...Ch. 2 - The table shows the number of sins and losses the...Ch. 2 - In a survey, 40 people were asked how many times...Ch. 2 - The population in Park City is made up of...Ch. 2 - Park city is broken down into six voting...Ch. 2 - The following data are the shoe sizes of 50 male...Ch. 2 - The following data are the number of sports played...Ch. 2 - The following data represent the number of...Ch. 2 - Construct a frequency polygon of U.S. Presidents’...
Ch. 2 - The following table is a portion of a data set...Ch. 2 - For the following 11 salaries, calculate the IQR...Ch. 2 - Find the interquartile range for the following two...Ch. 2 - Forty bus drivers were asked how many hours they...Ch. 2 - Refer to the Table 223. Find the third quartile....Ch. 2 - Listed are 29 ages for Academy Award sinning best...Ch. 2 - Listed are 30 ages for Academy Award winning best...Ch. 2 - For the 100-meter dash, the third quartile for...Ch. 2 - On a 60 point written assignment, the 80th...Ch. 2 - During a season, the 40th percentile for points...Ch. 2 - The following data are the number of pages In 40...Ch. 2 - The folloising data set show’s the heights in...Ch. 2 - Follow the steps you used to graph a...Ch. 2 - The following data show the number of months...Ch. 2 - In a sample of 60 households, one house is worth...Ch. 2 - The number of books checked out from the library...Ch. 2 - Five credit scores are 680, 680, 700, 720, 720....Ch. 2 - Mails conducted a study on the effect that playing...Ch. 2 - Discuss the mean, median, and mode for each of the...Ch. 2 - On a baseball team, the ages of each of the...Ch. 2 - The following data show the different types of pet...Ch. 2 - Find the standard deviation for the data from the...Ch. 2 - Two swimmers, Angie and Beth, from different...Ch. 2 - For each of the following data sets, create a stem...Ch. 2 - For each of the following data sets, create a stem...Ch. 2 - For each of the following data sets, create a stem...Ch. 2 - For each of the following data sets, create a stem...Ch. 2 - For each of the following data sets, create a stem...Ch. 2 - For each of the following data sets, create a stem...Ch. 2 - For each of the following data sets, create a stem...Ch. 2 - The students in Ms. Ramirez’s math class have...Ch. 2 - Using the data from Mrs. Ramirez’s math class...Ch. 2 - David County has six high schools. Each school...Ch. 2 - Use the data from the David County science...Ch. 2 - Sixty-five randomly selected car salespersons were...Ch. 2 - What does the frequency column in Table 2.42 sum...Ch. 2 - What does the relative frequency column in Table...Ch. 2 - What is the difference between relative frequency...Ch. 2 - What is the difference between cumulative relative...Ch. 2 - To construct the histogram for the data in Table...Ch. 2 -
Ch. 2 - Construct a frequency polygon from the frequency...Ch. 2 - Use the two frequency tables to compare the life...Ch. 2 - Construct a times series graph for (a) the number...Ch. 2 - The following data sets List full time police per...Ch. 2 - Listed are 29 ages for Academy Award winning best...Ch. 2 - Listed are 32 ages for Academy Award winning best...Ch. 2 - Jesse was ranked 37th in his graduating class of...Ch. 2 - a. For runners in a race, a low time means a...Ch. 2 - a. For runners in a race, a higher speed means a...Ch. 2 - On an exam, would it be more desirable to earn a...Ch. 2 - Mina is waiting in line at the Department of Motor...Ch. 2 - In a survey collecting data about the salaries...Ch. 2 - In a study collecting data about the repair costs...Ch. 2 - The University of California has two criteria used...Ch. 2 - Suppose that you are buying a house. You and your...Ch. 2 - First quartile = _______Ch. 2 - Second quartile = median = 50th percentile =Ch. 2 - Third quartile = _______Ch. 2 - Interquartile range (IQR) = _____ — _____Ch. 2 - Inteiquartile range (IQR = _____ — _____ = _____...Ch. 2 - percentile = _______Ch. 2 - Use the following information to answer the next...Ch. 2 - Use the following information to answer the next...Ch. 2 - Find the mean for the following frequency tables.Ch. 2 - Use the following information to answer the next...Ch. 2 - Use the following information to answer the next...Ch. 2 - Use the following information to answer the next...Ch. 2 - Use the following information to answer the next...Ch. 2 - Use the following information to answer the next...Ch. 2 - Use the following information to answer the next...Ch. 2 - Use the following information to answer the next...Ch. 2 - Use the following information to answer the next...Ch. 2 - Use the following information to answer the next...Ch. 2 - When the data are skewed left, what is the typical...Ch. 2 - When the data are symmetrical, what is the typical...Ch. 2 - What word describes a distribution that has two...Ch. 2 - Describe the shape of this distribution. Figure...Ch. 2 - Describe the relationship between the mode and the...Ch. 2 - Describe the relationship between the mean and the...Ch. 2 - Describe the shape of this distribution. Figure...Ch. 2 - Describe the relationship between the mode and the...Ch. 2 - Are the mean and the median the exact same in this...Ch. 2 - Describe the shape of this distribution. Figure...Ch. 2 - Describe the relationship between the mode and the...Ch. 2 - Describe the relationship between the mean and the...Ch. 2 - The mean and median for the data are the same. 3;...Ch. 2 - Which is the greatest, the mean, the mode, or the...Ch. 2 - Which is the least, the mean, the mode, and the...Ch. 2 - Of the three measures, which tends to reflect...Ch. 2 - In a perfectly symmetrical distribution, when...Ch. 2 - Use the following information to answer the next...Ch. 2 - Use the following information to answer the next...Ch. 2 - Two baseball players, Fredo and Karl, on different...Ch. 2 - Use Table 2.57 to find the value that is three...Ch. 2 - Find the standard deviation for the following...Ch. 2 - Student grades on a chemistry exam were: 77, 78,...Ch. 2 - Table 2.61 contains the 2010 obesity rates in U.S....Ch. 2 - Suppose that three book publishers were interested...Ch. 2 - Often, cruise ships conduct all on-board...Ch. 2 - Twenty-five randomly selected students were asked...Ch. 2 - The percentage of people who own at most three...Ch. 2 - If the data were collected by asking the first 111...Ch. 2 - Following are the 2010 obesity rates by U.S....Ch. 2 - The median age for U.S. blacks currently is 30.9...Ch. 2 - Six hundred adult Americans were asked by...Ch. 2 - Given the following box plot: Figure 2.41 a. which...Ch. 2 - The following box plot shows the U.S. population...Ch. 2 - In a survey of 2O-year-olds in China, Germany, and...Ch. 2 - Given the following box plot, answer the...Ch. 2 - Given the following box plots, answer t*...Ch. 2 - A survey was conducted of 130 purchases of new BMW...Ch. 2 - Twenty-five randomly selected students were asked...Ch. 2 - The most obese countries in the world have obesity...Ch. 2 - Table 2.72 gives the percent of children under...Ch. 2 - The median age of the U.S. population in 1980 was...Ch. 2 - Use the following information to answer the neat...Ch. 2 - Use the following information to answer the neat...Ch. 2 - Use the following information to answer the neat...Ch. 2 - Use the following information to answer the neat...Ch. 2 - Use the following information to answer the neat...Ch. 2 - Use the following information to answer the neat...Ch. 2 - Use the following information to answer the neat...Ch. 2 - Use the following information to answer the neat...Ch. 2 - Use the following information to answer the neat...Ch. 2 - Three students were applying to the same graduate...Ch. 2 - A music school has budgeted to purchase three...Ch. 2 - An elementary school class ran one mile with a...Ch. 2 - The most obese countries in the world have obesity...Ch. 2 - Table 2.76 gives the percent of children under...Ch. 2 - Santa, Clara Country, Ca, has approximately 27,873...Ch. 2 - Javier and Ercilia are supervisors at a shopping...Ch. 2 - What is the IQR? a. 8 b. 11 C. 15 d. 35Ch. 2 - What is the mode? a. 19 b. 19.5 c. 1and 20 d....Ch. 2 - Is this a sample or the entire population? a....Ch. 2 - Twenty-five randomly selected students were asked...Ch. 2 - Forty randomly selected students were asked the...Ch. 2 - Following are the published weights (in pounds) of...Ch. 2 - One hundred teachers attended a seminar on...Ch. 2 - Refer to Figure 2.50 determine which of the...Ch. 2 - In a recent issue of the IFFF Spectrum, 84...Ch. 2 - A survey of enrollment at 35 community colleges...Ch. 2 - Use the following information to answer the next...Ch. 2 - Use the following information to answer the not...Ch. 2 - Suppose that a publisher conducted a survey asking...
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