Homework Answers
Given :
n1 = 30
s1 = 8.5
n2 = 31
s2 = 6.6
conclusion
a) there is insufficient evidence to reject the claim that
1 is not 
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A random sample of size ni = 30 yields a standard deviation of 8.5, and a...
A random sample of size ny = 36 yields a variance of 6.2, and a random...
A random sample of size ny = 36 yields a variance of 6.2, and a random sample of size n2 = 37 yields a variance of 8.4. At a = 0.01, test the claim that the variance of Population 1 is less than the variance of Population 2. 1. The alternate hypothesis is Ha: si < 82 Οσι < σ2 oo <o Osi <s 2. This is a left tailed test with: dfn- and dfa - 3a. The STS (to...
The table below contains the results from random samples of two populations. Sample 51.6 40.3 36.9...
The table below contains the results from random samples of two populations. Sample 51.6 40.3 36.9 34.7 34.7 40.2 40.2 43 32.6 Sample 2 32.3 35.8 37.7 40.8 40.5 45.1 34.2 29.3 43 45 365 30.5 28.2 44.7 29.4 29.4 43.7 44.7 41.5 33.5 At a = 0.10, test the claim that the standard deviation of Population 1 is less than the standard deviation of Population 2. 1. The alternate hypothesis is Ha: Os <s Οσι < σ2 OO <o...
The table below contains the results from random samples of two populations. Sample 1 38.1 35.3...
The table below contains the results from random samples of two populations. Sample 1 38.1 35.3 43.2 40.4 43.8 wa 34.9 39.7 ca 35.8 293 41.3 47.1 45.4 35 Sample 2 35.1 42.4 33.1 41.9 53.5 10 40.6 18 33.8 20 48.9 23 33.6 18.5 44.5 53.7 At a = 0.10, test the claim that the variance of Population 1 is not the same as the variance of Population 2. 1. The alternate hypothesis is Ha: 001702 81 #82 Oss...
The table below gives results from random samples of salaries in two cities. Pop City 1...
The table below gives results from random samples of salaries in two cities. Pop City 1 San Francisco 2 Houston s($) 402947 36 | 3739 At a = 0.01, test the claim that salaries in San Francisco have the same variation as salaries in Houston. 1. The null hypothesis is Ho: O $i = 52 O I = 12 OH = H2 O 01 = 02 2. This is a two tailed test with: dfn and dfa- 3a. The STS...
The table below gives results from random samples of weights (in pounds) of men and women....
The table below gives results from random samples of weights (in pounds) of men and women. Pop Gender 1 Men 2 Women n s 40 8.7 33 10.6 At a 0.05, test the claim that weights of men are more consistent than weights of women. 1. The alternate hypothesis is Ha: Osı > S2 O si <S2 Οσι < σ2 Oo > 02 2. This is a left tailed test with: df and dfa 3a. The STS (to 2 decimals)...
Houston 310 325 334 383 319 306 Denver 315 336 401 404 Miami 374 369 327...
Houston 310 325 334 383 319 306 Denver 315 336 401 404 Miami 374 369 327 387 320 New York City Pittsburg 330 416 383 377 368 406 382 367 335 The table gives prices of houses in 5 cities, in $1000's. At a = 0.01, test the claim that the population mean price is the same for each city. 1. The null hypothesis is Ho: OH = H2 = 43 OH = H2 = H3 = 44 OM =...
The table below gives results from the times (in seconds) that runners Jared and Derek have...
The table below gives results from the times (in seconds) that runners Jared and Derek have taken to complete random samples of 10 kilometer races. Pop 1 2 Runner n Jared 29 Derek 28 30 48 At a 0.05, test the claim that Jared's times are less consistent than Derek's times. 1. The alternate hypothesis is Ha: Os > s Oo > o Oo <ož Os < s 2. This is a right tailed test with: df and dfa- 3a....
Page 3 of 7 A sample mean, sample size, and population standard deviation are given. Use...
Page 3 of 7 A sample mean, sample size, and population standard deviation are given. Use the one- mean z-test to perform the required hypothesis test about the mean, p, of the population from which the sample was drawn. = 54, n 36, σ = 5.6, Ho: μ = 56; Ha: μ < 56, a 0.05 a. Reject Ho if z -1.645z0.36; therefore do not reject Ho. The data do not provide sufficient evidence to support Ha: μ < 56....
A random sample from normal population yielded sample mean=40.8 and sample standard deviation=6.1, n = 15....
A random sample from normal population yielded sample mean=40.8 and sample standard deviation=6.1, n = 15. HO: u = 32.6, Haru # 32.6, a = 0.05. Perform the hypothesis test and draw your conclusion. Test statistic: t = 5.21. P-value=1.9E-7 (0.00000019). Reject Ho. There is sufficient evidence to support the claim that the mean is different from 32.6. Test statistic: t = 5.21. P-value=1.9E-7 (0.00000019). Do not reject HO. There is not sufficient evidence to support the claim that the...
x1 10 19 12 20 16 x2 21 16 13 19 13 20 19 x3 24...
x1 10 19 12 20 16 x2 21 16 13 19 13 20 19 x3 24 18 20 19 22 21 x4 19 20 16 25 x5 23 26 26 24 28 23 23 Test at a = 0.01 to determine if the population means are all the same. 1. The null hypothesis is Ho: Oui = 2 = 43 Oui = ly = H3 = 44 OM = H2 = H3 = HA = Hs 2. This is a...
A random sample of size ny = 36 yields a variance of 6.2, and a random sample of size n2 = 37 yields a variance of 8.4. At a = 0.01, test the claim that the variance of Population 1 is less than the variance of Population 2. 1. The alternate hypothesis is Ha: si < 82 Οσι < σ2 oo <o Osi <s 2. This is a left tailed test with: dfn- and dfa - 3a. The STS (to...
The table below contains the results from random samples of two populations. Sample 51.6 40.3 36.9 34.7 34.7 40.2 40.2 43 32.6 Sample 2 32.3 35.8 37.7 40.8 40.5 45.1 34.2 29.3 43 45 365 30.5 28.2 44.7 29.4 29.4 43.7 44.7 41.5 33.5 At a = 0.10, test the claim that the standard deviation of Population 1 is less than the standard deviation of Population 2. 1. The alternate hypothesis is Ha: Os <s Οσι < σ2 OO <o...
The table below contains the results from random samples of two populations. Sample 1 38.1 35.3 43.2 40.4 43.8 wa 34.9 39.7 ca 35.8 293 41.3 47.1 45.4 35 Sample 2 35.1 42.4 33.1 41.9 53.5 10 40.6 18 33.8 20 48.9 23 33.6 18.5 44.5 53.7 At a = 0.10, test the claim that the variance of Population 1 is not the same as the variance of Population 2. 1. The alternate hypothesis is Ha: 001702 81 #82 Oss...
The table below gives results from random samples of salaries in two cities. Pop City 1 San Francisco 2 Houston s($) 402947 36 | 3739 At a = 0.01, test the claim that salaries in San Francisco have the same variation as salaries in Houston. 1. The null hypothesis is Ho: O $i = 52 O I = 12 OH = H2 O 01 = 02 2. This is a two tailed test with: dfn and dfa- 3a. The STS...
The table below gives results from random samples of weights (in pounds) of men and women. Pop Gender 1 Men 2 Women n s 40 8.7 33 10.6 At a 0.05, test the claim that weights of men are more consistent than weights of women. 1. The alternate hypothesis is Ha: Osı > S2 O si <S2 Οσι < σ2 Oo > 02 2. This is a left tailed test with: df and dfa 3a. The STS (to 2 decimals)...
Houston 310 325 334 383 319 306 Denver 315 336 401 404 Miami 374 369 327 387 320 New York City Pittsburg 330 416 383 377 368 406 382 367 335 The table gives prices of houses in 5 cities, in $1000's. At a = 0.01, test the claim that the population mean price is the same for each city. 1. The null hypothesis is Ho: OH = H2 = 43 OH = H2 = H3 = 44 OM =...
The table below gives results from the times (in seconds) that runners Jared and Derek have taken to complete random samples of 10 kilometer races. Pop 1 2 Runner n Jared 29 Derek 28 30 48 At a 0.05, test the claim that Jared's times are less consistent than Derek's times. 1. The alternate hypothesis is Ha: Os > s Oo > o Oo <ož Os < s 2. This is a right tailed test with: df and dfa- 3a....
Page 3 of 7 A sample mean, sample size, and population standard deviation are given. Use the one- mean z-test to perform the required hypothesis test about the mean, p, of the population from which the sample was drawn. = 54, n 36, σ = 5.6, Ho: μ = 56; Ha: μ < 56, a 0.05 a. Reject Ho if z -1.645z0.36; therefore do not reject Ho. The data do not provide sufficient evidence to support Ha: μ < 56....
A random sample from normal population yielded sample mean=40.8 and sample standard deviation=6.1, n = 15. HO: u = 32.6, Haru # 32.6, a = 0.05. Perform the hypothesis test and draw your conclusion. Test statistic: t = 5.21. P-value=1.9E-7 (0.00000019). Reject Ho. There is sufficient evidence to support the claim that the mean is different from 32.6. Test statistic: t = 5.21. P-value=1.9E-7 (0.00000019). Do not reject HO. There is not sufficient evidence to support the claim that the...
x1 10 19 12 20 16 x2 21 16 13 19 13 20 19 x3 24 18 20 19 22 21 x4 19 20 16 25 x5 23 26 26 24 28 23 23 Test at a = 0.01 to determine if the population means are all the same. 1. The null hypothesis is Ho: Oui = 2 = 43 Oui = ly = H3 = 44 OM = H2 = H3 = HA = Hs 2. This is a...
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