Intro Stats
4th Edition
ISBN: 9780321826275
Author: Richard D. De Veaux
Publisher: PEARSON
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Chapter 20.3, Problem 2JC
To determine
Explain the conclusion for the hypothesis testing.
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Jane and Sam work in the same department for a large corporation. They are curious about the proportion of their coworkers who have children.
Jane obtains a list of all the workers in the department, randomly picks 20 names from the list, and asks those coworkers if they have children. She finds that 72% of those surveyed have children.
Sam waits in the break room one morning and asks the first 20 coworkers that pass by if they have children. He finds that 85% of those surveyed have children.
Which result is the better estimate of the proportion of coworkers who have children?
A business sent out a survey to it's customers in two groups; one under 30 years old (group 1) and
one over 30 years old (group 2). Customers were asked if they preferred to purchase items online or
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Out of 300 customers under 30 (group 1), 180 said that they purchased online.
Out of 300 customers over 30 (group 2), 170 said that they purchased online.
Is there a difference in the population proportion who purchased online? The business wanted to
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Ho: P2 P1 O versus Ha: P2 - P₁ does not equal Ö.
What is the p-value?
Use JMP and round the p-value to two decimal places.
Indiana has a population of about 7 million people and Ohio about 12 million. Is it
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why not. If yes, give an example of how that could happen.
Chapter 20 Solutions
Intro Stats
Ch. 20.3 - A public broadcasting station plans to launch a...Ch. 20.3 - Prob. 2JCCh. 20.4 - Prob. 3JCCh. 20.4 - Prob. 4JCCh. 20.5 - Prob. 5JCCh. 20.5 - Prob. 6JCCh. 20.5 - Prob. 7JCCh. 20.5 - Prob. 8JCCh. 20.6 - Prob. 9JCCh. 20.6 - Recall the experiment comparing patients 4 weeks...
Ch. 20.6 - Prob. 11JCCh. 20 - Canada Suppose an advocacy organization surveys...Ch. 20 - Non-profits Do people who work for non-profit...Ch. 20 - Prob. 3ECh. 20 - Prob. 4ECh. 20 - Canada, deux The information in Exercise 1 was...Ch. 20 - Prob. 6ECh. 20 - Prob. 7ECh. 20 - Prob. 8ECh. 20 - Prob. 9ECh. 20 - Prob. 10ECh. 20 - Prob. 11ECh. 20 - Prob. 12ECh. 20 - Prob. 13ECh. 20 - Athlete ages, again Using the summary statistics...Ch. 20 - Prob. 15ECh. 20 - Athlete ages, ninth inning The researchers in...Ch. 20 - Prob. 17ECh. 20 - Athlete ages, overtime Repeat the test you did in...Ch. 20 - Prob. 19ECh. 20 - Prob. 20ECh. 20 - Prob. 21ECh. 20 - Prob. 22ECh. 20 - Prob. 23ECh. 20 - Prob. 24ECh. 20 - Prob. 25ECh. 20 - Prob. 26ECh. 20 - Prob. 27ECh. 20 - Graduation The U.S. Department of Commerce...Ch. 20 - Prob. 29ECh. 20 - Carpal tunnel The painful wrist condition called...Ch. 20 - Prob. 31ECh. 20 - Prob. 32ECh. 20 - Ear infections A new vaccine was recently tested...Ch. 20 - Anorexia The Journal of the American Medical...Ch. 20 - Prob. 35ECh. 20 - Prob. 36ECh. 20 - Teen smoking A Vermont study published by the...Ch. 20 - Depression A study published in the Archives of...Ch. 20 - Birthweight The Journal of the American Medical...Ch. 20 - Politics and sex One month before the election, a...Ch. 20 - Prob. 41ECh. 20 - Prob. 42ECh. 20 - Pain Researchers comparing the effectiveness of...Ch. 20 - Gender gap Candidates for political office realize...Ch. 20 - Prob. 45ECh. 20 - Prob. 46ECh. 20 - Sensitive men In the same article from Exercise...Ch. 20 - Carbs Recently, the Gallup Poll asked 1005 U.S....Ch. 20 - Food preference GfK Roper Consulting gathers...Ch. 20 - Prob. 50ECh. 20 - Hot dogs In the July 2007 issue, Consumer Reports...Ch. 20 - Prob. 52ECh. 20 - Prob. 53ECh. 20 - Prob. 54ECh. 20 - Hot dogs, last one In Exercise 53, we saw a 90%...Ch. 20 - Third load of wash In Exercise 54, we saw a 98%...Ch. 20 - Prob. 57ECh. 20 - Prob. 58ECh. 20 - Prob. 59ECh. 20 - Prob. 60ECh. 20 - Commuting A man who moves to a new city sees that...Ch. 20 - Pulse rates A researcher wanted to see whether...Ch. 20 - 63. View of the water How much extra is having a...Ch. 20 - New construction The house sales we looked at in...Ch. 20 - Cereal sugar The data below show the sugar content...Ch. 20 - Prob. 66ECh. 20 - Prob. 67ECh. 20 - Prob. 68ECh. 20 - Prob. 69ECh. 20 - Prob. 70ECh. 20 - Prob. 71ECh. 20 - Prob. 72ECh. 20 - Prob. 73ECh. 20 - Prob. 74ECh. 20 - Prob. 75ECh. 20 - Ad campaign You are a consultant to the marketing...Ch. 20 - Prob. 77ECh. 20 - Thirsty? Researchers randomly assigned...Ch. 20 - Prob. 79ECh. 20 - Prob. 80ECh. 20 - 81. Running heats In Olympic running events,...Ch. 20 - Prob. 82ECh. 20 - Tees Does it matter what kind of tee a golfer...Ch. 20 - Golf again Given the test results on golf tees...Ch. 20 - Music and memory Is it a good idea to listen to...Ch. 20 - Rap Using the results of the experiment described...
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- Last year, 41% of business owners gave a holiday gift to their employees. A survey of business owners conducted this year indicates that 32% planned to provide a holiday gift to their employees. Suppose the survey results are based on a sample of 55 business owners. How many business owners in the survey planned to provide a holiday gift to their employees this year?arrow_forwardAt a small Midwestern college, a survey determined that 61% of freshmen participated in intercollegiate athletics. Further 48% participated in a campus social club. However, 18% did not participate in either type of activity. What percentage participated in either sports or a social club?arrow_forwardPhineas Phillips, from Philadelphia, has a fascination with fun phone facts. But Phineas has furrowed his brow because his cousin Felix (from Florida) claims to have a phone fact that Phineas is not familiar with. His cousin claims that the percentage of iPhone users in Canada is different than it is in the United States. Phineas knows (for a fact) that the percentage of smart phone users in the US that prefer iPhones is 45%. A random sample of 400 Canadian smart phone users indicates that 160 of them prefer iPhones. Can Phineas conclude, at a 10% level of significance that the percent of iPhone users in the US is different than it is in Canada? What is the null hypothesis? What is the alternate hypothesis? Is this a left tail, right tail, or two tailed test? What is the value of the test statistic? What is your conclusion for the hypothesis test?arrow_forward
- The proportion of commuters on PSU – Berks campus is purported to be 65%. A professor believes this to be inaccurate. He randomly selects 300 students on campus and determines 200 of them to be commuters. Can the professor reject the campus claim of 65%?arrow_forwardTaylor decided that she needed to make a bit of extra money so she decided to participate in a clinical trial for a drug company called Good Pharma. They are trying to see if a new diet pill is more effective than a placebo pill in helping people loose weight. She is randomly assigned to one of the groups and the researchers put all of the participants on the same workout and meal plan. 50 people were placed in the placebo group and 36 in the diet pill group. After two months the researchers brought everyone in and they recorded the number of lbs lost and tested at the alpha level of 0.03. Testing Output Group 1 Sample Statistics: sample mean diet pill= 13.25 lbs sample standard deviation diet pill= 2.6 lbs Group 2 Sample Statistics: sample mean placebo= 9.75 lbs sample standard deviation diet pill= 3.432 lbs pvalue= 0.0144 Confidence Interval= [1.25, ∞ ] Analysis What test would be appropriate for this scenario? H0:…arrow_forwardSam has conducted a survey to get more information about healthy diets. He hands his survey out to 100 people in the cafeteria at his college. Only 45 people choose to participate in the survey, leaving 55 people that did not respond. Which type of bias does this scenario best describe?arrow_forward
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