Introductory Statistics (10th Edition)
10th Edition
ISBN: 9780321989178
Author: Neil A. Weiss
Publisher: PEARSON
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Textbook Question
Chapter 10.3, Problem 96E
Working with Large Data Sets
10.96 Treating Psychotic Illness. L. Petersen et al. evaluated the effects of
- a. Obtain normal probability plots, boxplots, and the standard deviations for the two samples.
- b. Based on your results from part (a), which would you be inclined to use to compare the population means: a pooled or a nonpooled t-procedure? Explain your answer.
- c. Do the data provide sufficient evidence to conclude that, on average, clients preferred the integrated treatment? Perform the required hypothesis test at the 1% significance level by using both the pooled t-test and the nonpooled t-test. Compare your results.
- d. Find a 98% confidence interval for the difference between mean client satisfaction scores for the two treatments. Obtain the required confidence interval by using both the pooled t-interval procedure and the nonpooled t-interval procedure. Compare your results.
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A study was performed looking at the effect of physical activity on cognitive function among adults at high risk for Alzheimer's disease. There were 170 eligible subjects randomly assigned to either an exercise intervention (exercise group) or a control intervention (control group). The subjects were followed at 6-month intervals up to
18 months of follow-up. The primary assessment scale was the Alzheimer's Disease Assessment Scale-Cognitive Subscale (ADAS-Cog). The results at 18 months of follow-up among participants with mild cognitive impairment are given in the table below. (Let population 1 be the exercise group and population 2 be the control group.
Use exercise group control group.)
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mild cognitive impairment in the ADAS-Cog
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n
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48
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(a) What is the standard deviation of…
A pathological video game user (PVGU) is a video game user that averages 31 or more hours a week of gameplay. According to the article “Pathological Video Game Use among Youths: A Two-Year Longitudinal Study” (Pediatrics, Vol. 127, No. 2, pp. 319–329) by D. Gentile et al., in 2011, about 9% of children in grades 3–8 were PVGUs. Suppose that, today, five youths in grades 3–8 are randomly selected. Let X represent the number of youths who are PVGUs.
n =
p =
1 – p =
Prepare the probability distribution for the random variable X. Complete the following table. Round your answers to 4 decimal places e.g. 0.XXXX or .XXXX.
X = x
P(X=x)
0
1
2
3
4
5
∑=1.0000∑=1.0000
Calculate the probability that EXACTLY three youths are PVGUs. Round your answers to 4 decimal places e.g. 0.XXXX or .XXXX.
P(X = 3) =
Calculate the probability that AT LEAST two youths are PVGUs. Round your answers to 4 decimal places e.g. 0.XXXX or .XXXX.
P(X ≥ 2) =
Calculate the…
A pathological video game user (PVGU) is a video game user that averages 31 or more hours a week of gameplay. According to the article “Pathological Video Game Use among Youths: A Two-Year Longitudinal Study” (Pediatrics, Vol. 127, No. 2, pp. 319–329) by D. Gentile et al., in 2011, about 9% of children in grades 3–8 were PVGUs. Suppose that, today, five youths in grades 3–8 are randomly selected. Let X represent the number of youths who are PVGUs.
Calculate the probability that EXACTLY three youths are PVGUs
Chapter 10 Solutions
Introductory Statistics (10th Edition)
Ch. 10.1 - Understanding the Concepts and Skills 10.1 Give an...Ch. 10.1 - Define the phrase independent samples.Ch. 10.1 - consider the quantities 1, 1, x1, s1 2, 2, x2and,...Ch. 10.1 - Discuss the basic strategy for performing a...Ch. 10.1 - In each of Exercises 10.510.10, we have stated the...Ch. 10.1 - In each of Exercises 10.510.10, we have stated the...Ch. 10.1 - In each of Exercises 10.510.10, we have stated the...Ch. 10.1 - Prob. 8ECh. 10.1 - In each of Exercises 10.5-10.10, we have stated...Ch. 10.1 - In each of Exercises 10.510.10, we have stated the...
Ch. 10.1 - Prob. 11ECh. 10.1 - Identify the assumption for using the two-means...Ch. 10.1 - In each of Exercises 10.1310.18, we have presented...Ch. 10.1 - In each of Exercises 10.1310.18, we have presented...Ch. 10.1 - In each of Exercises 10.1310.18, we have presented...Ch. 10.1 - Prob. 16ECh. 10.1 - In each of Exercises 10.1310.18, we have presented...Ch. 10.1 - Prob. 18ECh. 10.1 - A variable of two populations has a mean of 40 and...Ch. 10.1 - Prob. 20ECh. 10.1 - Prob. 21ECh. 10.1 - Prob. 22ECh. 10.1 - Prob. 23ECh. 10.1 - Prob. 24ECh. 10.1 - In Exercises 10.2510.30, hypothesis tests are...Ch. 10.1 - Prob. 26ECh. 10.1 - Prob. 27ECh. 10.1 - In Exercises 10.2510.30, hypothesis tests are...Ch. 10.1 - Prob. 29ECh. 10.1 - In Exercises 10.2510.30, hypothesis tests are...Ch. 10.2 - Regarding the four conditions required for using...Ch. 10.2 - Explain why sp is called the pooled sample...Ch. 10.2 - Prob. 35ECh. 10.2 - Prob. 36ECh. 10.2 - Prob. 37ECh. 10.2 - In each of Exercises 10.3510.38, we have provided...Ch. 10.2 - Prob. 39ECh. 10.2 - In each of Exercises 10.3910.44, we have provided...Ch. 10.2 - Prob. 41ECh. 10.2 - Prob. 42ECh. 10.2 - Prob. 43ECh. 10.2 - Prob. 44ECh. 10.2 - Applying the Concepts and Skills Preliminary data...Ch. 10.2 - Prob. 46ECh. 10.2 - Fortified Juice and PTH. 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An independent golf equipment...Ch. 10.2 - Extending the Concepts and Skills 10.60 In this...Ch. 10.2 - Prob. 61ECh. 10.2 - Prob. 63ECh. 10.2 - Prob. 64ECh. 10.2 - Prob. 65ECh. 10.3 - In each of Exercises 10.6710.70, suppose that you...Ch. 10.3 - In each of Exercises 10.6710.70, suppose that you...Ch. 10.3 - Prob. 69ECh. 10.3 - In each of Exercises 10.6710.70, suppose that you...Ch. 10.3 - Each pair of graphs in Fig. 10.8 shows the...Ch. 10.3 - Prob. 72ECh. 10.3 - In each of Exercises 10.7310.78, we have provided...Ch. 10.3 - In each of Exercises 10.7310.78, we have provided...Ch. 10.3 - In each of Exercises 10.7310.78, we have provided...Ch. 10.3 - In each of Exercises 10.7310.78, we have provided...Ch. 10.3 - Prob. 77ECh. 10.3 - In each of Exercises 10.7310.78, we have provided...Ch. 10.3 - Political Prisoners. According to the American...Ch. 10.3 - Phyllodes Tumors. Phyllodes tumors of the breast...Ch. 10.3 - Acute Postoperative Days. 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The National Education...Ch. 10.4 - Prob. 135ECh. 10.4 - Prob. 136ECh. 10.4 - Prob. 138ECh. 10.5 - Slate one possible advantage of using paired...Ch. 10.5 - Prob. 140ECh. 10.5 - Prob. 141ECh. 10.5 - Prob. 142ECh. 10.5 - In Exercises 10.143-10.148, hypothesis tests...Ch. 10.5 - In Exercises 10.143-10.148, hypothesis tests...Ch. 10.5 - In Exercises 10.143-10.148, hypothesis tests...Ch. 10.5 - Prob. 146ECh. 10.5 - Prob. 147ECh. 10.5 - Prob. 148ECh. 10.5 - Prob. 149ECh. 10.5 - Prob. 150ECh. 10.5 - Prob. 151ECh. 10.5 - Prob. 152ECh. 10.5 - Prob. 153ECh. 10.5 - Prob. 154ECh. 10.5 - Applying the Concepts and Skills Preliminary data...Ch. 10.5 - Prob. 156ECh. 10.5 - Prob. 157ECh. 10.5 - Measuring Treadwear. R. Stichler et al. compared...Ch. 10.5 - Glaucoma and Corneal Thickness. Glaucoma is a...Ch. 10.5 - Cooling Down. Cooling down with a cold drink...Ch. 10.5 - Prob. 161ECh. 10.5 - Prob. 162ECh. 10.5 - Prob. 163ECh. 10.5 - Prob. 164ECh. 10.5 - Prob. 165ECh. 10.5 - In Exercise 10.161-10.166, apply Producer 10.7 on...Ch. 10.5 - Prob. 167ECh. 10.5 - Prob. 168ECh. 10.5 - Prob. 169ECh. 10.5 - Working with Large Data Sets 10. 170 Faculty...Ch. 10.5 - Prob. 171ECh. 10.5 - Storm Hydrology and Clear Cutting. In the document...Ch. 10.5 - Prob. 173ECh. 10.5 - Prob. 174ECh. 10.5 - Gasoline Additive. This exercise shows what can...Ch. 10.6 - Understanding the Concepts and Skills 10.177...Ch. 10.6 - A hypothesis test based on a simple random paired...Ch. 10.6 - Suppose that you want to perform a hypothesis test...Ch. 10.6 - Suppose that you want to perform a hypothesis test...Ch. 10.6 - Prob. 181ECh. 10.6 - Prob. 182ECh. 10.6 - Prob. 183ECh. 10.6 - Prob. 184ECh. 10.6 - Prob. 185ECh. 10.6 - Prob. 186ECh. 10.6 - Prob. 187ECh. 10.6 - Prob. 188ECh. 10.6 - Prob. 189ECh. 10.6 - Prob. 190ECh. 10.6 - Glaucoma and Corneal Thickness. Glaucoma is a...Ch. 10.6 - Cooling Down. Cooling down with a cold drink...Ch. 10.6 - Prob. 193ECh. 10.6 - Tobacco Mosaic Virus. 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