What are the degrees of freedom? df N dfl What assumptions are you making about the original distribution? O The populations follow independent normal distributions. We have random samples from each population. O The populations follow independent chi-square distributions. We have random samples from each population. O The populations follow independent normal distributions. O The populations follow dependent normal distributions. We have random samples from each population. (c) Find or estimate the P-value of the sample test statistic. (Use 4 decimal places.) O p-value > 0.200 O 0.100 < p-value < 0.200 O 0,050 < p-value < 0.100 O 0.020 < p-value < 0.050 O 0.002 < p-value < 0.020 O p-value < 0.002 (d) Based on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis? O At the a - 0.05 level, we reject the null hypothesis and conclude the data are not statistically significant. O At the a-0.05 level, we reject the null hypothesis and conclude the data are statistically significant. O At the a 0.05 level, we fail to reject the null hypothesis and conclude the data are not statistically significant. O At the a- 0.05 level, we fail to reject the null hypothesis and conclude the data are statistically significant

MATLAB: An Introduction with Applications
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Chapter1: Starting With Matlab
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What are the degrees of freedom?
df N
dfol
What assumptions are you making about the original distribution?
O The populations follow independent normal distributions. We have random samples from each population.
O The populations follow independent chi-square distributions. We have random samples from each population.
O The populations follow independent normal distributions.
O The populations follow dependent normal distributions. We have random samples from each population.
(c) Find or estimate the P-value of the sample test statistic. (Use 4 decimal places.)
O p-value > 0.200
O 0.100 < p-value < 0.200
O 0,050 < p-value < 0.100
O 0.020 < p-value < 0.050
O 0.002 < p-value < 0.020
O p-value < 0.002
(d) Based on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis?
O At the a =0.05 level, we reject the null hypothesis and conclude the data are not statistically significant.
O At the a - 0.05 level, we reject the null hypothesis and conclude the data are statistically significant.
O At the a =0.05 level, we fail to reject the null hypothesis and conclude the data are not statistically significant.
O At the a -0.05 level, we fail to reject the null hypothesis and conclude the data are statistically significant.
(e) Interpret your conclusion in the context of the application.
O Fail to reject the null hypothesis, there is sufficient evidence that the variance in annual wheat production differs between the two plots.
O Reject the null hypothesis, there is insufficient evidence that the variance in annual wheat production differs between the two plots.
O Reject the null hypothesis, there is sufficient evidence that the variance in annual wheat production differs between the two plots.
O Fail to reject the null hypothesis, there is insufficient evidence that the variance in annual wheat production differs between the two plots.
O Type here to search
79 F Mostly sunny
Transcribed Image Text:What are the degrees of freedom? df N dfol What assumptions are you making about the original distribution? O The populations follow independent normal distributions. We have random samples from each population. O The populations follow independent chi-square distributions. We have random samples from each population. O The populations follow independent normal distributions. O The populations follow dependent normal distributions. We have random samples from each population. (c) Find or estimate the P-value of the sample test statistic. (Use 4 decimal places.) O p-value > 0.200 O 0.100 < p-value < 0.200 O 0,050 < p-value < 0.100 O 0.020 < p-value < 0.050 O 0.002 < p-value < 0.020 O p-value < 0.002 (d) Based on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis? O At the a =0.05 level, we reject the null hypothesis and conclude the data are not statistically significant. O At the a - 0.05 level, we reject the null hypothesis and conclude the data are statistically significant. O At the a =0.05 level, we fail to reject the null hypothesis and conclude the data are not statistically significant. O At the a -0.05 level, we fail to reject the null hypothesis and conclude the data are statistically significant. (e) Interpret your conclusion in the context of the application. O Fail to reject the null hypothesis, there is sufficient evidence that the variance in annual wheat production differs between the two plots. O Reject the null hypothesis, there is insufficient evidence that the variance in annual wheat production differs between the two plots. O Reject the null hypothesis, there is sufficient evidence that the variance in annual wheat production differs between the two plots. O Fail to reject the null hypothesis, there is insufficient evidence that the variance in annual wheat production differs between the two plots. O Type here to search 79 F Mostly sunny
Two plots at Rothamsted Experimental Station were studied for production of wheat straw. For a random sample of years, the annual wheat straw production (in pounds) from one plot was as follows.
6.40
7.06
7.03
7.17
6.96
7.31
7.18
5.79
6.24
5.91
6.14
Use a calculator to verify that, for this plot, the sample variance is s2 x (0.317.
Another random sample of years for a second plot gave the following annual wheat production (in pounds).
7.10
7.03 8.15 5.91 7.22
5.58
5.47
5.86
Use a calculator to verify that the sample variance for this plot is s2 0.933.
Test the clalm that there is a difference (eilther way) in the population variance of whcat straw production for thesc two plots. Use a 5% level of signifcance.
(a) What is the level of significance?
0.05
State the null and alternate hypotheses.
O H, 0,2 = 0,2; H,0,? >0,?
O H,i 0,> 0,, H;:0,² = 0,
O H, 0, = 0,; H; 0,?>0,?
2.
2
1 01
%3D
(b) Find the value of the sattiple F statistlc. (Usc 2 decimal places.)
Whal are the degrees of tfreedom?
df N
dfl
What assumptions are you making about the original distribution?
O The populations follow independent normal distributions. We have random saimples from cach popalalion.
O The pupulations follow independent chi-square distributions. Wc have rando sples from cach popiilation.
O The nonulations follw indencndent natmal distrihutions
1:13 PM
79°F Mostly sunny
7/30/2021
19
P Type here to search
(36
Transcribed Image Text:Two plots at Rothamsted Experimental Station were studied for production of wheat straw. For a random sample of years, the annual wheat straw production (in pounds) from one plot was as follows. 6.40 7.06 7.03 7.17 6.96 7.31 7.18 5.79 6.24 5.91 6.14 Use a calculator to verify that, for this plot, the sample variance is s2 x (0.317. Another random sample of years for a second plot gave the following annual wheat production (in pounds). 7.10 7.03 8.15 5.91 7.22 5.58 5.47 5.86 Use a calculator to verify that the sample variance for this plot is s2 0.933. Test the clalm that there is a difference (eilther way) in the population variance of whcat straw production for thesc two plots. Use a 5% level of signifcance. (a) What is the level of significance? 0.05 State the null and alternate hypotheses. O H, 0,2 = 0,2; H,0,? >0,? O H,i 0,> 0,, H;:0,² = 0, O H, 0, = 0,; H; 0,?>0,? 2. 2 1 01 %3D (b) Find the value of the sattiple F statistlc. (Usc 2 decimal places.) Whal are the degrees of tfreedom? df N dfl What assumptions are you making about the original distribution? O The populations follow independent normal distributions. We have random saimples from cach popalalion. O The pupulations follow independent chi-square distributions. Wc have rando sples from cach popiilation. O The nonulations follw indencndent natmal distrihutions 1:13 PM 79°F Mostly sunny 7/30/2021 19 P Type here to search (36
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