Introductory Statistics1st EditionBarbara Illowsky, Susan Dean Publisher: OpenStax CollegeISBN: 9781938168208
Introductory Statistics
Solutions for Introductory Statistics
Problem 9.1TI:
A medical trial is conducted to test whether or not a new medicine reduces cholesterol by 25%. State...Problem 9.2TI:
We want to test whether the mean height of eighth graders is 66 inches. State the null and...Problem 9.3TI:
We want to test If It takes fewer than 45 minutes (0 teach a lesson plan. State the null and...Problem 9.4TI:
On a state drivers test. about .10% pass the test on the first a We want to test if more than .10%...Problem 9.5TI:
Suppose the null hypothesis, H0, Is: the blood cultures contain no traces of pathogen X. State the I...Problem 9.6TI:
Suppose the null hypothesis. H0. Is: a patient is not sick. Which type of error has the greater...Problem 9.7TI:
“Red tide” is a bloom of poison-producing algae—a few different species of a class of plankton...Problem 9.8TI:
Determine both Type I and Type II errors for the following scenario: Assume a null hypothesis, H0....Problem 9.9TI:
A normal distribution has a standard deviation of 1. We want to verify a claim that the mean Is...Problem 9.10TI:
Its a Boy Genetics Labs claim their procedures improve the chances of a boy being born. The results...Problem 9.11TI:
H0:=10, H0:< 10 Assume the p-value is 0.0935. What type of test is this? Draw the picture of the...Problem 9.12TI:
H0:1,Ha:1 Assume the p-value is 0.1243. What type of test is this? Draw the picture of the p-value.Problem 9.13TI:
H0:p=0.5,Ha:p0.5 Assume the p-value is 0.2564. What type of test is this? Draw the picture of the...Problem 9.14TI:
The mean throwing distance of a football for Marco, a high school freshman quarterback, is 40 yards,...Problem 9.16TI:
It is believed that a stock price for a particular company will grow at a rate of 55 per week with a...Problem 9.17TI:
A teacher believes that 85% of students in the class will want to go on a field trip to the local...Problem 9.18TI:
Marketers believe that 92% of adults In the United States own a cell phone. A cell phone...Problem 1P:
You are testing that the mean speed of your cable Internet connection Is more than three Megabits...Problem 2P:
You ate testing that the mean speed of your cable Internet connection is more than three Megabits...Problem 3P:
The American family has an average of two children. What is the random variable? Describe in words.Problem 4P:
The mean entry level salary of an employee at a company is $58.000. You believe it Is hIg1er for IT...Problem 5P:
A sociologist claims the probability that a person picked at random in Times Square in New York City...Problem 6P:
A sociologist claims the probability that a person picked at random in Times Square in New York City...Problem 7P:
In a population of fish approximately 42% are female. A test is conducted to see if. in fact, the...Problem 8P:
Suppose that a recent article stated that the mean time spent In jail by a first—time convicted...Problem 9P:
A random survey of 75 death row Inmates revealed that the mean length of time on death row Is 17.4...Problem 10P:
The National Institute of Mental Health published an article stating that In any one-year period,...Problem 11P:
The mean price of mid-sized cars In a region is $32,000. A test is conducted to see if the claim is...Problem 12P:
A sleeping bag Is rested to withstand temperatures of —15 °F. You think the bag cannot stand...Problem 13P:
For Exercise 9.12, what are and in words?Problem 14P:
In words, describe 1— 3For Exercise 9.12.Problem 15P:
A group of doctors is deciding whether or not to perform an operation. Suppose the null hypothesis,...Problem 16P:
A group of doctors is deciding whether or not to perform an operation. Suppose the null hypothesis,...Problem 18P:
A group of divers is exploring an old sunken ship. Suppose the null hypothesis. H0, Is: the sunken...Problem 19P:
A microbiologist is testing a water sample for E-coli. Suppose the null hypothesis. H0. is: the...Problem 20P:
A microbiologist is testing a water sample for E-coli. Suppose the null hypothesis, H0, is: the...Problem 22P:
Which distribution do you use when you are testing a population mean and the population standard...Problem 23P:
Which distribution do you use when the standard deviation is not known and you are testing one...Problem 24P:
A population mean Is 13. The sample mean is 12.8. and the sample standard deviation is two. The...Problem 25P:
A population has a mean is 25 and a standard deviation of five. The sample mean Is 24, and the...Problem 26P:
It Is thought that .12% of respondents in a taste test would prefer Brand A. In a particular test of...Problem 27P:
You ate performing a hypothesis test of a single population mean using a Students t-distribution....Problem 28P:
You are performing a hypothesis test of a single population mean using a Students t-distribution....Problem 29P:
You are performing a hypothesis test of a single population proportion. What must be true about the...Problem 30P:
You are performing a hypothesis test of a single population proportion. You find out that np is less...Problem 31P:
You are peform1ng a hypothesis test of a single population proportion. The data come from which...Problem 32P:
When do you reject the null hypothesis?Problem 33P:
The probability of winning the grand prize at a particular carnival game is 0.005. Is the outcome of...Problem 34P:
The probability of winning the grand prize at a particular carnival game is 0.005. Michele wins the...Problem 35P:
It is believed that the mean height of high school students who play basketball on the school team...Problem 36P:
The mean age of graduate students at a University is at most 31 y ears with a standard deviation of...Problem 37P:
Does the shaded region represent a low or a high p-value compared to a level of significance of 1%?...Problem 38P:
What should you do when a >p-value?Problem 39P:
What should you do if a = p-value?Problem 40P:
If you do not reject the null hypothesis, then it must be true. Is this statement correct? State why...Problem 41P:
Use the blowing information to answer the next seen exeircises: Suppose that a recent article stated...Problem 42P:
Use the blowing information to answer the next seen exeircises: Suppose that a recent article stated...Problem 43P:
Use the blowing information to answer the next seen exeircises: Suppose that a recent article stated...Problem 44P:
Use the blowing information to answer the next seen exeircises: Suppose that a recent article stated...Problem 45P:
Use the blowing information to answer the next seen exercises: Suppose that a recent article stated...Problem 46P:
Use the blowing information to answer the next seen exeircises: Suppose that a recent article stated...Problem 47P:
Use the blowing information to answer the next seen exeircises: Suppose that a recent article stated...Problem 48P:
A random survey of 75 death row inmates revealed that the mean length of time on death row is 17.4...Problem 51P:
Assume H0: p = 0.25 and Ha: p 0.25. Is this a left-tailed, right-tailed, or two-tailed test?Problem 52P:
Draw the general graph of a left-tailed test.Problem 53P:
Draw the graph of a two-tailed test.Problem 54P:
A bottle of water Is labeled as containing 16 fluid ounces of water. You believe it Is less than...Problem 55P:
Your friend claims that his mean golf score Is 63. You want to show that it Is higher than that....Problem 56P:
A bathroom scale claims to be able to dentify correctly any weight within a pound. You think that It...Problem 57P:
You flip a coin and record whether it shows heads or tails. You know the probability of getting...Problem 58P:
If the alternative hypothesis has a not equals ( ) symbol, you know to use which type of test?Problem 59P:
Assume the null hypothesis states that the mean is at least 18. Is this a left-tailed, right-tailed,...Problem 60P:
Assume the null hypothesis states that the mean is at most 12. Is this a left-tailed, right-tailed,...Problem 61P:
Assume the null hypothesis states that the mean Is equal to 88. The alternative hypothesis states...Problem 62H:
Some of the following statements refer to the null hypothesis, some to the alternate hypothesis....Problem 63H:
Over the past few decades, public health officials have examined the link between weight concerns...Problem 64H:
A statistics instructor believes that fewer than 20% of Evergjeen Valle College (EVC) students...Problem 65H:
Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the...Problem 66H:
State the Type I and Type II errors in complete sentences given the following statements. a. The...Problem 67H:
For statements a-j in Exercise 9.109. answer the following in complete sentences. a. State a...Problem 68H:
When a new drug is created. the pharmaceutical company must subject ft to testing before receiving...Problem 69H:
A statistics instructor believes that fewer than 20% of Evergreen Valley College (EVC) students...Problem 70H:
It Is believed that Lake Tahoe Community College (LTCC) Intermediate Algebra students get less than...Problem 71H:
Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the...Problem 72H:
It Is believed that Lake Tahoe Community College (LTCC) Intermediate Algebra students get less than...Problem 73H:
The National Institute of Mental Health published an article stating that In any one-year period,...Problem 74H:
A particular brand of tires claims that its deluxe tire averages at least 50000 miles before It...Problem 75H:
From generation to generation, the mean age when smokers first start to smoke varies. However, the...Problem 76H:
The cost of a daily newspaper varies from city to city However, the variation among prices remains...Problem 77H:
An article in the San Jose Mercury News stated that students in the California state university...Problem 78H:
The mean number of sick days an employee takes per year is believed to be about ten. Members of a...Problem 79H:
In 1955, Life Magazine reported that the 25 year-old mother of three worked, on average, an 80 hour...Problem 80H:
Your sta1stIcs Instructor claims that 60 percent of the students who rake her Elementar Statistics...Problem 81H:
A Nissan Motor Corporation advertisement read, The average mans LQ. is 107. The average brown trouts...Problem 82H:
Refer to Exercise 9.19. Conduct a hypothesis test to see if your decision and conclusion would...Problem 83H:
According to an article in Newsweek, the natural ratio of girls to boys is 100:105. In China, the...Problem 84H:
A poll done for Newsweek found that 13% of Americans have seen or sensed the presence of an angel. A...Problem 85H:
The mean work week for engineers In a start-up company is believed to be about 60 hours. A newly...Problem 86H:
Use the Lap time data for Lap .1 (see Appendix C) to test the claim that Terii finishes Lap J. on...Problem 87H:
Use the initial Public Offering’ data (see Appendix C) to test the claim that the mean offer price...Problem 88H:
“Asian Family Reunion,” by Chau Nguyen Every two years it comes around. We all get together from...Problem 89H:
‘The Problem with Angels,” by Cyndy Dowling Although this problem is wholly mine, The catalyst came...Problem 90H:
“Blowing Bubbles,” by Sondra Prull Studying stats just made me tense, I had to find some sane...Problem 91H:
“Dalmatian Darnation,” by Kathy Sparling A greedy dog breeder named Spreckles Bred puppies with...Problem 92H:
‘MacaronI and Cheese, please! I” by Nedda Misberghl and Rachelle Hall As a poor starving student I...Problem 93H:
“William Shakespeare: The Tragedy of Hamlet. Prince of Denmark,” by Jacqueline Ghodsi THE CHARACTERS...Problem 94H:
“Untitled.” by Stephen Chen lye often wondered how software is released and sold to the public....Problem 95H:
Japanese Glrls Names’ by Kumi Furnichi It used to be vet typical for Japanese girls names to end...Problem 96H:
‘Phillip’s Wish,” by Suzanne Osorlo My nephew likes to play Chasing the girls makes his day. He...Problem 97H:
“The Craven,” by Mark Salangsang Once upon a morning dreary In stats class I as weak and weary....Problem 98H:
Toastmasters Inteniational cites a repol by Gallop Poll that .10°O of Americans fear public...Problem 99H:
Sixty-eight percent of online courses taught at community colleges nationwide were taught by Mi-time...Problem 100H:
According to an article In Bloomberg Businessweek, New York City’s most recent adult smoking rate Is...Problem 101H:
The mean age of De Anza College students in a previous term was 26.6 years old. An instructor thinks...Problem 102H:
Registered nurses earned an average annual salary of $69,110. For that same year. a survey was...Problem 103H:
La Leche League International reports that the mean age of weaning a child from breastfeeding is age...Problem 104H:
Over the past few decades, public health officials have examined the link between weight concerns...Problem 105H:
A statistics instnictor believes that fewer than 20% of EverWeen Valley College (EVC) students...Problem 106H:
Previously, an organization reported that teenagers spent 3.5 hours per week, on average, on the...Problem 107H:
According to the Centet for Disease Control websfte, In 2011 at least 18% of high school students...Problem 108H:
A recent survey In the N.Y. limes Almanac indicated that 4.8.8% of families own stock A broker...Problem 109H:
Driver error can be listed as the cause of approximately 54% of all fatal auto accidents, according...Problem 110H:
The US Department of Energy reported that 51.7% of homes were heated by natural gas. A random sample...Problem 111H:
For Americans using library services, the American Librar Association claims that at most 67à of...Problem 112H:
The Weather Underground reported that the mean amount of summer rainfall for the northeastern US Is...Problem 113H:
A survey in the N.Y. limes Almanac finds the mean commute time (one way) 15 25.4 minutes for the 15...Problem 114H:
A report by the Gallup Poll found that a woman visits her doctor, on average, at most 5.8 tImes each...Browse All Chapters of This Textbook
Chapter 1 - Sampling And DataChapter 2 - Descriptive StatisticsChapter 3 - Probability TopicsChapter 4 - Discrete Random VariablesChapter 5 - Continuous Random VariablesChapter 6 - The Normal DistributionChapter 7 - The Central Limit TheoremChapter 8 - Confidence IntervalsChapter 9 - Hypothesis Testing With One SampleChapter 10 - Hypothesis Testing With Two Samples
Book Details
Introductory Statistics follows the scope and sequence of a one-semester, introduction to statistics course and is geared toward students majoring in fields other than math or engineering. This text assumes students have been exposed to intermediate algebra, and it focuses on the applications of statistical knowledge rather than the theory behind it. The foundation of this textbook is Collaborative Statistics, by Barbara Illowsky and Susan Dean, which has been widely adopted. Introductory Statistics includes innovations in art, terminology, and practical applications, all with a goal of increasing relevance and accessibility for students. We strove to make the discipline meaningful and memorable, so that students can draw a working knowledge from it that will enrich their future studies and help them make sense of the world around them. The text also includes Collaborative Exercises, integration with TI-83,83+,84+ Calculators, technology integration problems, and statistics labs.
Sample Solutions for this Textbook
We offer sample solutions for Introductory Statistics homework problems. See examples below:
More Editions of This Book
Corresponding editions of this textbook are also available below:
INTRODUCTORY STATISTICS
13th Edition
ISBN: 2810015182961
Introductory Statistics
16th Edition
ISBN: 9781948847001
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