PreviousProblem ListNextIn order to compare the means of two populations, independent random samples of 237| observations are selected from each population, with the following results:Sample 1 Sample 221 12s1 = 130 s2175(a) .Use a 971 % confidence interval to estimate the difference between the population means (41 – H2)!(b) . Test the null hypothesis: Ho : (41 - 42) = 0 versus the alternative hypothesis: H. : (41 – 42) + 0|. Using a = 0.03 give the following:(i) , the test statistic z =(ii) .the positive critical 21 score(ii) . the negative critical 21scoreThe final conclustion isOA. We can reject the null hypothesis that (41 – 42) = 0 and accept that (1 – H2) + 0OB. There is not sufficient evidence to reject the null hypothesis that (1 - H2) = 0(c) . Test the null hypothesis: Ho : (u - 12) = 21| versus the alternative hypothesis: H, : (41 - 42) + 21. Using a = 0.03. give the following:(i) , the test statistic z =(ii) .the positive critical 2l score(ii) . the negative critical 21scoreThe final conclustion isOA. There is not sufficient evidence to reject the null hypothesis that (1 - 42) = 21OB. We can reject the null hypothesis that (41 – H2) = 21| and accept that (41 - 42) + 21

Given n1=n2=237 X1bar=1,X2bar=130 S1=175, S2=175

Previous Problem List Next In order to compare the means of two populations, independent random samples of 237l observations are selected from each population, with the following results: Sample 1 Sample 2 1 z2 = 2 130 s2 = 175 51 (a) .Use a 971 % confidence interval to estimate the difference between the population means (4 - 2) < (41 - 42) 4 (b) . Test the nul hypothesis: Ho : (41- H2) = 0 versus the alternative hypothesis: H. : (41 - Hz) + 0 Using a = 0.03 give the following: (1) .the test statistic z = (i) .the positive critical ascore (i) . the negative critical ascore. The final conclustion is OA. We can reject the null hypothesis that (41 - H2) = qand accept that (1 - H2) + 4 OB. There is not sufficient evidence to reject the null hypothesis that ( - pa) = 0 (c) , Test the null hypothesis: Ho : (41 – 2) = 21| versus the alternative hypothesis: H, : (41 - Hz) + 21| Using a = 0.01 give the following (1) .the test statistic z = (i) the positive critical ascore (i) . the negative critical Ascore. The final conclustion is OA. There is not sufficient evidence to reject the null hypothesis that (41 - 2) = 21 OB. We can reject the null hypothesis that (41 - H2) = 21|ļand accept that (41 - H2) + 21|

Previous Problem List Next In order to compare the means of two populations, independent random samples of 237l observations are selected from each population, with the following results: Sample 1 Sample 2 1 z2 = 2 130 s2 = 175 51 (a) .Use a 971 % confidence interval to estimate the difference between the population means (4 - 2) < (41 - 42) 4 (b) . Test the nul hypothesis: Ho : (41- H2) = 0 versus the alternative hypothesis: H. : (41 - Hz) + 0 Using a = 0.03 give the following: (1) .the test statistic z = (i) .the positive critical ascore (i) . the negative critical ascore. The final conclustion is OA. We can reject the null hypothesis that (41 - H2) = qand accept that (1 - H2) + 4 OB. There is not sufficient evidence to reject the null hypothesis that ( - pa) = 0 (c) , Test the null hypothesis: Ho : (41 – 2) = 21| versus the alternative hypothesis: H, : (41 - Hz) + 21| Using a = 0.01 give the following (1) .the test statistic z = (i) the positive critical ascore (i) . the negative critical Ascore. The final conclustion is OA. There is not sufficient evidence to reject the null hypothesis that (41 - 2) = 21 OB. We can reject the null hypothesis that (41 - H2) = 21|ļand accept that (41 - H2) + 21|

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Suppose we have two normal populations denoted A and B, and we want to compare their population variances by estimating the ratio: variance of population B divided by variance of population A. We have an independent random sample of size 15 from population A and an independent random sample of size 9 from population B. The sample variance for population B turns out to be 30 percent larger than that for population A. What is the 99 percent confidence interval for the ratio: population variance of population B divided by population variance of population A? Use stattrek.org for finding the needed critical values.
Given two independent random samples with the following results: n1=12x‾1=73s1=27n1=12x‾1=73s1=27 n2=12x‾2=102s2=22n2=12x‾2=102s2=22 Use this data to find the 95%95% confidence interval for the true difference between the population means. Assume that the population variances are equal and that the two populations are normally distributed. Step 1 of 3 : Find the point estimate that should be used in constructing the confidence interval.
11. Consider a random sample Y₁, Y2, ..., Yn from a normal population Y~N(μ, o²) where the population variance and mean are unknown. We want to construct a Σ(X-X)² Show 100(1 a)% confidence interval for the population variance if g² whether or not is a pivotal quantity and construct a 100(1-a) confidence interval.
Answer question 4
QUESTION 16 A 95% confidence interval of the mean is (12, 18). The result of testing Hn:u=14against H:u 14 at 0.05 level of significance, will be Reject the null hypothesis because 14 is more than 12 Do not reject the null hypothesis because 14 is between 12 and 18 There is insufficient information to make any conclusions about the hypothesis test Do not reject the the null hypothesis because 14 is less than 18 QUESTION 17 A multiple-choice quiz has 100 questions each with 5 possible answers of which only 1 is correct. Using Normal Click Save and Submit to save and submit. Click Save All Answers to save all aswers. DELL
You have taken a random sample of sizen & 95of a normal population that has a population mean ofμ = 140and a population standard deviation ofo = 23. Your sample, which is Sample 1 in the following table, has a mean ofx = 141.3. (In the table, Sample 1 is indicated by "M1", Sample 2 by "M2", and so on.) (to) Based on Sample 1, plot the confidence intervals of80%and95%for the population mean. Use1,282as the critical value for the confidence interval of 80%and use1960 as the critical value for the confidence interval of95%. (If necessary, you can refer to a list of formulas .) • Write the upper limit and the lower limit on the graphs to indicate each confidence interval. Write the answers with one decimal place. • For the points (♦and ◆), write the population mean, μ = 140. 128.0 128.0 80% confidence interval 139.0 X Ś 150.0 150.0 128.0 128.0 95% confidence interval 139.0 X Ś 150.0 150.0
Given two independent random samples with the following results: n1=10x‾1=89s1=19�1=10�‾1=89�1=19 n2=17x‾2=128s2=28�2=17�‾2=128�2=28 Use this data to find the 90%90% confidence interval for the true difference between the population means. Assume that the population variances are equal and that the two populations are normally distributed. Copy Data Step 1 of 3 : Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.
b )part?
We have provided the sample standard deviations and sample sizes for independent simple random samples from two populations. In each case, use the two-standarddeviations F-test and the two-standard-deviations F-interval procedure to conduct the required hypothesis test and obtain the specified confidence interval. s1 = 14.5, n1 = 11, s2 = 30.4, n2 = 9 a. two-tailed test, α = 0.05 b. 95% confidence interval
Question 9 Two independent samples are selected from two populations with means µg and u2, respectively. Suppose a 99% confidence interval for u1 - H2 is (-1.65, 21.65), a 95% confidence interval is (0.2, 19.8), and a 90% confidence interval is (1.775, 18.225). In testing Ho : H1 - H2 = 0 versus H1: H1 - H2 0, the p-value is between 0.20 and 1.00 between 0.10 and 0.15 between 0.05 and 0.10 between 0.01 and 0.05. between 0.15 and 0.20
QUESTION 5 You're running a one-sample t-test comparing your sample (M = 27.9, SD = 3.8) of 28 observations with a population that has p-36.7 at a = 0.05. Calculatet obs %3D your confidence interval: to and your decision regarding the null hypothesis (reject/fail to reject): QUESTION 6 You're running a one-sample t-test comparing your sample (M 22.2, SD = 3.5) of 15 observations with a population that has u = 22.5 at a = 0.001. Calculate t_obs your confidence interval: to and your decision regarding the null hypothesis (reject/fail to reject):