In a completely randomized experimental design, 11 experimental units were used for each of the 3 treatments. Part of the ANOVA table is shown below. ANOVA Source of Variation SS df Between Groups Within Groups Total 1500 6000 32 MS Fill in the blanks in the above ANOVA table.At 95% confidence, test to determine whether or not the means of the 3 populations are equal. Find MSE. MSE is

In a completely randomized experimental design, 11 experimental units were used for each of the 3 treatments. Part of the ANOVA table is shown below. ANOVA Source of Variation SS df Between Groups Within Groups Total 1500 6000 32 MS Fill in the blanks in the above ANOVA table.At 95% confidence, test to determine whether or not the means of the 3 populations are equal. Find MSE. MSE is

ENGR.ECONOMIC ANALYSIS

14th Edition

ISBN:9780190931919

Author:NEWNAN

Publisher:NEWNAN

Chapter1: Making Economics Decisions

Section: Chapter Questions

Problem 1QTC

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You may need to use the appropriate appendix table technology to answer this question. Consider the following results for independent samples taken from two populations. Sample 1 Sample 2 = 400 n, = 300 P1 = 0.49 P2 = 0.35 (a) What is the point estimate of the difference between the two population proportions? (Use p, - P,.) 20.2 (b) Develop a 90% confidence interval for the difference between the two population proportions. (Use p, - p2. Round your answer to four decimal places.) 14.4 to 26 (c) Develop a 95% confidence interval for the difference between the two population proportions. (Use p, - p,. Round your answer to four decimal places.) 14.4 to 26 Need Help? Read It Master It
In studying his campaign plans, Mr. Singleton wishes to estimate the difference between men's and women's views regarding his appeal as a candidate. He asks his campaign manager to take two random independent samples and find the 80%80% confidence interval for the difference. A random sample of 508508 male voters and 605605 female voters was taken. 108108 men and 193193 women favored Mr. Singleton as a candidate. Find this confidence interval. Step 2 of 4 : Find the critical value that should be used in constructing the confidence interval.
In studying his campaign plans, Mr. Singleton wishes to estimate the difference between men's and women's views regarding his appeal as a candidate. He asks his campaign manager to take two random independent samples and find the 80%80% confidence interval for the difference. A random sample of 508508 male voters and 605605 female voters was taken. 108108 men and 193193 women favored Mr. Singleton as a candidate. Find this confidence interval. Step 1 of 4 : Find the values of the two sample proportions, pˆ1�^1 and pˆ2�^2. Round your answers to three decimal places.
A study was done in 1998 by Dr. Benjamin Levine to explore the role of altitude training in athletic performance. First, he trained athletes at low altitude, then measured their finish times in a 5 kilometer run. Then the athletes were placed into one of the following groups: I, living and training at high altitude; Il, living at high altitude and training at low; or Ill, living and training at low altitude. The athletes were then retested in another low-altitude 5 K race. In this study, what are the control and experimental data? What are the dependent and independent variables? The results are expressed as average change in speed of each group. I: -3.4 sec., Il: +13.4 sec., Ill: -26.7 sec. a. Graph and interpret the results. b. Did the results surprise you? Why or why not? c. Explain why the three groups obtained the results presented? d.How did altitude affect blood composition and why? e.How would athletes' performance be affected if they live, train, and compete at different…
technology to answer uns estion. A research center has conducted extensive research on social media usage. One finding was that 73% of adults aged 18 to 24 use Snapchat. Another finding was that 44% of those aged 18 to 24 use Twitter. Assume the sample size associated with both findings is 600. (a) Develop a 95% confidence interval for the proportion of adults aged 18 to 24 who use Snapchat. (Round your answers to four decimal places.) to (b) Develop a 99% confidence interval for the proportion of adults aged 18 to 24 who use Twitter. (Round your answers to four decimal places.) to (c) In which case, part (a) or part (b), is the margin of error larger? Explain why. The margin of error is larger in part (b) ✓for two reasons. The sample proportion of adults aged 18 to 24 who use Twitter is ---Select--than the sample proportion of adults aged 18 to 24 who use Snapchat. Therefore, the standard error of the former is ---Select--than the standard error of the latter. In addition, Z/2 for a…
Ca = 40 + 0.80 (Y-T) Ig = 30 Xn= 10 T=20 G=20 DI-Y-T
Why can we not use first differences when we have independent cross sections in two years (as opposed to panel data)?
Country Financial, a financial services company, uses surveys of adults age 18 and older to determine if personal financial fitness is changing over time (USA Today, April 4, 2012). In February 2012, a sample of 1000 adults showed 410 indicating that their financial security was more than fair. In February 2010, a sample of 900 adults showed 315 indicating that their financial security was more than fair. State the hypotheses that can be used to test for a significant difference between the population proportions for the two years. What is the sample proportion indicating that their financial security was more than fair in 2012? In 2010? Conduct the hypothesis test and compute the p-value. At a .05 level of significance, what is your conclusion? What is the 95% confidence interval estimate of the difference between the two population proportions?
Researchers conducted a prospective cohort study to assess the association between dietary supplements and cognitive ability among children. A total of 500 children age 12-17 years who take an omega-3 fatty acid supplement are compared with 500 children age 12-17 years who do not take an omega-3 fatty acid supplement. Researchers follow the children for 2 years. During this time, 300 children who take the supplement earn what is classified as a “high” score on a cognitive test while 200 children who do not take the supplement earn what is classified as a “high” score on the same cognitive test. Show calculations. a) Construct a 2x2 table from the information presented above b) The risk difference is:
A researcher is interested in determining if there is a relationship between exercise and blood pressure for adults over 50. A random sample of 236 adults over 50 is selected and the results are given below. Blood Pressure | Low Moderate High Exercise Walkers Non-walkers | 21 35 62 25 65 28 Test the claim that walking and blood pressure are independent. Use a= 0.01.
Fewer young people are driving. In 1995, 63.9% of people under 20 years old who were eligible had a driver's license. Bloomberg reported that percentage had dropped to 41.7% in 2016. Suppose these results are based on a random sample of 1,200 people under 20 years old who were eligible to have a driver's license in 1995 and again in 2016. a. At 95% confidence, what is the margin of error and the interval estimate of the number of eligible people under 20 years old who had a driver's license in 1995? Margin of error (to four decimal places) Interval estimate to (to four decimal places) b. At 95% confidence, what is the margin of error and the interval estimate of the number of eligible people under 20 years old who had a driver's license in 2016? Margin of error = (to four decimal places) Interval estimate = to (to four decimal places) c. Is the margin of error the same in parts (a) and (b)? - Select your answer v Why, or why not?
A number of particular articles has been classified according to their weights. After drying for two weeks the same articles have again been weighted and similarly classified. It is known that the median weight in the first weighing was 20-83 gm. while in the second weighing it was 17-35 gm. Some frequencies a and b in the first weighing and x and y in the second are missing. It is known that a = x and b missing frequencies. 1 5 y. Find out the values of the Class Frequencies Class Frequencies 1st weighing 2nd weighing 1st weighing 2nd weighing 0-5 15-20 52 a 50 5-10 20-25 75 30 10-15 11 40 25-30 22 28