Introductory Statistics (2nd Edition)
2nd Edition
ISBN: 9780321978271
Author: Robert Gould, Colleen N. Ryan
Publisher: PEARSON
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Chapter 10, Problem 48SE
a.
To determine
Find and compare the negative appendectomy rates for low-dose CT and standard-dose CT group.
b.
To determine
Conclude whether the negative appendectomy rate and dosage are independent using a significance level of
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Chapter 10 Solutions
Introductory Statistics (2nd Edition)
Ch. 10 - Tests a. In Chapter 8, you learned some tests of...Ch. 10 - In Chapter 9, you learned some tests of means. Are...Ch. 10 - Crime and Gender A statistics student conducted a...Ch. 10 - Red Cars and Stop Signs The table shows the raw...Ch. 10 - The table summarizes the outcomes of a study that...Ch. 10 - Finger Length There is a theory that relative...Ch. 10 - Prob. 7SECh. 10 - Prob. 8SECh. 10 - Effects of Television Violence on Men (Example 1)...Ch. 10 - Prob. 10SE
Ch. 10 - Mummies with Heart Disease According to the...Ch. 10 - Prob. 12SECh. 10 - Violins Stradivarius violins, made in the 1700s by...Ch. 10 - Coin Flips You flip a coin 100 times and get 58...Ch. 10 - Prob. 15SECh. 10 - Prob. 16SECh. 10 - Prob. 17SECh. 10 - Prob. 18SECh. 10 - Are Humans Like Random Number Generators? (Example...Ch. 10 - Is the Random Number Table Really Random? We...Ch. 10 - Coin Spins A penny was spun on a hard, flat...Ch. 10 - Prob. 22SECh. 10 - Is the Six-Sided Die Fair? The table shows the...Ch. 10 - Is the Six-Sided Die Fair? Repeat the chi-square...Ch. 10 - Violins Professional musicians listened to five...Ch. 10 - Mummies with Heart Disease Exercise 10.11 on...Ch. 10 - Party and Right Direction (Example 4) Suppose a...Ch. 10 - Antibiotic or Placebo A large number of surgery...Ch. 10 - Prob. 29SECh. 10 - Prob. 30SECh. 10 - Prob. 31SECh. 10 - Unemployment Rates U.S. Unemployment rates for all...Ch. 10 - Prob. 33SECh. 10 - Weight Loss Overweight or obese adults from...Ch. 10 - Prob. 35SECh. 10 - Prob. 36SECh. 10 - Gender and Happiness of Marriage The table shows...Ch. 10 - Is Smiling Independent of Age? Randomly chosen...Ch. 10 - Preschool Attendance and High School Graduation...Ch. 10 - Preschool Attendance and High School Graduation...Ch. 10 - Preschool Attendance and High School Graduation...Ch. 10 - Prob. 42SECh. 10 - Prob. 43SECh. 10 - Antiretrovirals to Prevent HIV A study conducted...Ch. 10 - Confederates and Compliance A study was done to...Ch. 10 - Endocarditis Kang et al. reported on a randomized...Ch. 10 - Prob. 47SECh. 10 - Prob. 48SECh. 10 - Prob. 49SECh. 10 - Night Shifts A random sample of nurses working...Ch. 10 - Gender and Political Party Affiliation The data in...Ch. 10 - Children and Happiness The data in the table come...Ch. 10 - Prob. 53SECh. 10 - Nice Rats Rats had a choice of freeing another rat...Ch. 10 - Young Criminals and Violence A statistics student...Ch. 10 - Egg Allergy in Children In a randomized,...Ch. 10 - Suppose you have a random sample of students...Ch. 10 - In exercises 10.57 to 10.64, choose an appropriate...Ch. 10 - Suppose you take a survey of random students at a...Ch. 10 - Prob. 60CRECh. 10 - Prob. 61CRECh. 10 - In exercises 10.57 to 10.64, choose an appropriate...Ch. 10 - Prob. 63CRECh. 10 - In exercises 10.57 to 10.64, choose an appropriate...Ch. 10 - Perry Preschool Arrests The Perry Preschool...Ch. 10 - Parental Training and Criminal Behavior of...Ch. 10 - Prob. 67CRECh. 10 - Prob. 68CRECh. 10 - Prob. 69CRECh. 10 - Prob. 70CRECh. 10 - Robot Cockroaches Cockroaches tend to rest in...Ch. 10 - Robot Cockroaches Refer to the description in...Ch. 10 - Prob. 73CRECh. 10 - Conviction Rate with Opposite Race Here are the...
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- Current Attempt in Progress Dark Chocolate for Good Health A study examines chocolate's effects on blood vessel function in healthy people. In the randomized, double-blind, placebo- controlled study, 11 people received 46 grams (1.6 ounces) of dark chocolate (which is naturally flavonoid-rich) every day for two weeks, while a control group of 10 people received a placebo consisting of dark chocolate with low flavonoid content. Participants had their vascular health measured (by means of flow-mediated dilation) before and after the two-week study. The increase over the two-week period was measured, with larger numbers indicating greater vascular health. For the group getting the good dark chocolate, the mean increase was 1.3 with a standard deviation of 2.32, while the control group had a mean change of-0.96 with a. standard deviation of 1.58. "Engler, M., et. al., "Flavonoid-rich dark chocolate improves endothelial function and increases plasma epicatechin concentrations in healthy…arrow_forwardWhat is the sensitivity of this test? What is the specificity of this test?arrow_forwardAge-related Macular Degeneration (AMD) is a common eye condition leading to vision loss. It causes damage to the macula, a small spot near the center of the retina (the part of the eye needed for sharp, central vision). Researchers are interested in the experiences of people who have been diagnosed with early-onset AMD. In particular the researchers are interested in whether the mean age at diagnosis of all people with early-onset AMD is less than 55 years. A random sample of 20 people with early-onset AMD gave the following data on age at diagnosis, in years. Patient 1 2 3 4 5 6 7 8 9 10 Age at diagnosis 50 58 52 58 49 58 51 61 54 59 Patient 11 12 13 14 15 16 17 18 19 20 Age at diagnosis 53 44 46 47 42 56 57 49 41 43 (c) What is the P-value of the test that is closest to 5%? (d) State the conclusion of the test at the 5% level of significance.arrow_forward
- Age-related Macular Degeneration (AMD) is a common eye condition leading to vision loss. It causes damage to the macula, a small spot near the center of the retina (the part of the eye needed for sharp, central vision). Researchers are interested in the experiences of people who have been diagnosed with early-onset AMD. In particular the researchers are interested in whether the mean age at diagnosis of all people with early-onset AMD is less than 55 years. A random sample of 20 people with early-onset AMD gave the following data on age at diagnosis, in years. 1 2 3 4 5 Patient 678 9 10 Age at diagnosis 50 58 52 58 49 58 51 61 54 59 Patient 11 12 13 14 15 16 17 18 19 20 Age at diagnosis 53 44 46 47 42 56 57 49 41 43 (a) State the null and alternative hypotheses for an appropriate non-parametric test using the correct parameter. (b) Describe an appropriate rejection region to test the claim, and state the distribution of the test statistic. (c) What is the P-value of the test that is…arrow_forwardOverproduction of uric acid in the body can be an indication of cell breakdown. This may be an advance indication of illness such as gout, leukemia, or lymphoma. Over a period of months, and adult male patient has taken 13 blood test for uric acid. The main concentration was X=5.41 mg/dl. The distribution of uric acid and healthy adult meals can be assumed to be normal, with o=1.81 mg/dl. find a 95% confidence interval for the population mean concentration of uric acid in the patient's blood. What is the margin of error? (Round your answers to two decimal places.) lower limit= upper limit=arrow_forwardSpecificity measures the likelihood of a test being negative given someone does not have the disease. Articulate what the specificity would tell us in context to screening passengers in an airport.arrow_forward
- Positive autocorrelation in control charts has which of the following characteristics? A. Is observed when large values follow large values B. Can cause high false-negative rates for special cause variation C. Is seen when large values follow small values D. Is a rare occurrence with measurements of a same patient or provider over timearrow_forwardStudy Purpose: The aim of this randomized controlled trial was to compare a nurse practitioner lead intervention to standard prescription of controlled-release oxycodone for patients who had undergone cesarean section. Participants were followed to explore their experience of pain and how pain impacts maternal health over three months. Post-intervention pain scores were measured using a pain scale ranging from 0 (no pain) to 10 (maximum pain). The results for this study are summarized in the table below. Table 2. Pain Scores on first postoperative day Change in mean pain score Change in mean pain score (SD) Difference between mean pain scores Intervention (SD) Group (n=65) p-value Control Group (n=66) [95% CI] -2.5 (1.1) -0.9 (0.7) -1.6 [-2.1, -0.3] 0.001 Using data from the table above answer the following questions: 1. What is the treatment effect for the primary outcome (pain)? 2. Provide a written interpretation of the change scores and treatment effect. Support your answer with…arrow_forwardA medical journal reported on an experiment intended to see if a certain drug could be used as a treatment for the eating disorder anorexia nervosa. The subjects were randomly divided into two groups. Of the 98 who received this drug, 70 were deemed healthy a year later, compared to 50 of the 88 who got the placebo. What is the population for this study? Is this an experimental study? Explain. What is the explanatory variable? What is the response variable? Complete the 2x2 table of counts.arrow_forward
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