Consider the following results for independent samples taken from two populations.Sample 1 Sample 2n₁ = 400n₂ = 300P₁ = 0.53P₂ = 0.35(a) What is the point estimate of the difference between the two population proportions? (Use P₁ – P₂.)-(b) Develop a 90% confidence interval for the difference between the two population proportions. (Use P₁ - P₂. Round your answer to four decimal places.)to(c) Develop a 95% confidence interval for the difference between the two population proportions. (Use P₁ - P₂. Round your answer to four decimal places.)to

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Use the given information to answer the following questions. independent samples of 6 measurements from each of 4 populations; MSE = 6.69 with 20 degrees of freedom, x, = 88.9 and x, = 83.5, 90% confidence Find a confidence interval estimate for u,. (Round your answers to three decimal places.) to Find a confidence interval estimate for u, - Hg. (Round your answers to three decimal places.) to You may need to use the appropriate appendix table or technology to answer this question. Need Help? Read It
Peggy constructed the 95 percent confidence interval (4.8,5.2)(4.8,5.2) to estimate the slope of a regression model for a set of bivariate data with 24 data values. Peggy claims that the width of the confidence interval will increase if a sample size of 30 is used, all other things remaining the same. Quincy claims that the width of the confidence interval will decrease if a sample size of 30 is used. Which statement is true about the claims made by Peggy and Quincy? A)Peggy’s claim is correct. B)Quincy’s claim is correct. C)Both Peggy’s claim and Quincy’s claim are correct. D)Neither Peggy’s claim nor Quincy’s claim is correct. E)There is not enough information to determine whether the claims are correct.
In order to compare the means of two populations, independent random samples of 410 observations are selected from each.population, with the results found in the Sample 1 table to the right. Complete parts a through e below. X = 5,339 s, = 158 Sample 2 X2 = 5,298 $2 = 193 a. Use a 95% confidence interval to estimate the difference between the population means (H1 -42)- Interpret the confidence interval. The confidence interval is ( ). (Round to one decimal place as needed.)
Joshua wants to replicate a study where the lowest observed value is 12.4 while the highest is 12.8. He wants to estimate the population mean u to within an error of 0.025 of its true value. Using 99% confidence level, find the sample size n that he needs. Solution: (a) Known Information: Za/2 ;E = (b) Desired Sample Size
Use the following information to answer the two exercises: The following data are the results of a random survey of 110 respondents about their shopping behaviour. The question was: How often do you go grocery shopping per week? Construct a 95% confidence interval for the true population mean number of grocery shoppings. Assume the underlying population is approximately normal. The sample variance calculated from the frequency table is 1,5. Number of Frequency shoppings 11 1 27 2 33 3 20 4 19 а. (2,0; 2,5) b. (1,8; 2,3) c. (1,9; 2,5) d. (1,8; 2,4)
Here are summary statistics for randomly selected weights of newborn girls: n=157, x=29.4 hg, s=6.7 Construct a confidence interval estimate of the mean. Use a 95% confidence level. Are these results very different from the confidence interval 28.8 hg<μ<31.0 hg with only 20 sample values, x=29.9 hg, and s=2.4 hg? What is the confidence interval for the population mean μ? nothing hg<μ<nothing hg (Round to one decimal place as needed.)
Use the sample Information a = 36, o = 6, n= 11 to calculate the following confidence Intervals for u assuming the sample is from a normal population. (a) 90 percent confidence. (Round your answers to 4 decimal places.) The 90% confidence Interval Is from to (b) 95 percent confidence. (Round your answers to 4 decimal places.) The 95% confidence interval is from to (c) 99 percent confidence. (Round your answers to 4 decimal places.) The 99% confidence Interval is from to
5.1 & 6.2 Question 13, 6.1.34 Part 1 of 2 Use the confidence interval to find the estimated margin of error. Then find the sample mean. HW Score: 44.29%, 15.5 of 35 O Points: 0 of 1 A store manager reports a confidence interval of (44.8,83.8) when estimating the mean price (in dollars) for the population of textbooks. The estimated margin of error is (Type an integer or a decimal.) Clear all his View an example Get more help - Q Search
Tina catches a 14-pound bass. She does not know the population mean or standard deviation. So she takes a sample of five friends and they say the last bass they caught was 9, 12, 13, 10, and 10 pounds. Find the t and calculate a 95% (α = .05) confidence interval.
For the data set below, calculate r, r2, and a 95 percent confidence interval in r units. Then write a one- to two sentence conclusion statement that includes whether the null hypothesis was rejected or not and whether there is a strong /weak/no relationship. Assume a two tailed hypothesis and α = .05. Case 1 Case 2 Case 3 Case 4 Case 5 Case 6 X 1.05 1.15 1.30 2.00 1.75 1.00 Y 2 2 3 4 5 2
You are conducting a hypothesis test on the body weights of male fraternity members. The research (alternative) hypothesis is that the averge weight is less than 200 lbs. Your test will be at the 0.01 significance level. You take a sample of 100 men, and find that the sample average is 210 lbs, and the standard error is 2 lbs. What is the value of your test statistic? (Please answer to two decimal places. ex: 5.43)
Use the data to calculate the sample variance, s. (Round your answer to five decimal places.) n = 7: 1.6, 3.5, 1.6, 2.1, 3.1, 2.9, 3.0 %3D Construct a 95% confidence interval for the population variance, of. (Round your answers to two decimal places.) to Test Ho: = 0.8 versus H: of + 0.8 using a = 0.05. State the test statistic. (Round your answer to two decimal places.) x2 State the rejection region. (If the test is one-tailed, enter NONE for the unused region. Round your answers to two decimal places.) x2 > x² State the conclusion. H, is rejected. There is sufficient evidence to indicate that the population variance is different from 0.8. H, is rejected. There is insufficient evidence to indicate that the population variance is different from 0.8. H, is not rejected. There is sufficient evidence to indicate that the population variance is different from 0.8. O Ho is not rejected. There is insufficient evidence to indicate that the population variance is different from 0.8.

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