MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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How do i calculate g on calculate g
A sociologist is interested in the relation between x = number of job changes and y = annual salary (in thousands of dollars) for people living in the Nashville area. A random sample of 10 people employed in Nashville provided the following information.
x (number of job changes) | 4 | 5 | 6 | 6 | 1 | 5 | 9 | 10 | 10 | 3 |
y (Salary in $1000) | 37 | 34 | 32 | 32 | 32 | 38 | 43 | 37 | 40 | 33 |
In this setting we have Σx = 59, Σy = 358, Σx2 = 429, Σy2 = 12,948, and Σxy = 2180.
(a) Find x, y, b, and the equation of the least-squares line. (Round your answers for x and y to two decimal places. Round your least-squares estimates to four decimal places.)
(b) Draw ascatter diagram displaying the data. Graph the least-squares line on your scatter diagram. Be sure to plot the point (x, y).
(c) Find the samplecorrelation coefficient r and the coefficient of determination. (Round your answers to three decimal places.)
What percentage of variation in y is explained by the least-squares model? (Round your answer to one decimal place.)
%
(d) Test the claim that the population correlation coefficient ρ is positive at the 5% level of significance. (Round your test statistic to three decimal places.)
Find or estimate the P-value of the test statistic.
Conclusion
(e) If someone had x = 10 job changes, what does the least-squares line predict for y, the annual salary? (Round your answer to two decimal places.)
thousand dollars
(f) Find Se. (Round your answer to two decimal places.)
Se =
(g) Find a 90% confidence interval for the annual salary of an individual with x = 10 job changes. (Round your answers to two decimal places.)
(h) Test the claim that the slope β of the population least-squares line is positive at the 5% level of significance. (Round your test statistic to three decimal places.)
Find or estimate the P-value of the test statistic.
x | = | |
y | = | |
b | = | |
ŷ | = | + x |
(b) Draw a
(c) Find the sample
r = | |
r2 = |
What percentage of variation in y is explained by the least-squares model? (Round your answer to one decimal place.)
%
(d) Test the claim that the population correlation coefficient ρ is positive at the 5% level of significance. (Round your test statistic to three decimal places.)
t =
Find or estimate the P-value of the test statistic.
P-value > 0.2500.125 < P-value < 0.250 0.100 < P-value < 0.1250.075 < P-value < 0.1000.050 < P-value < 0.0750.025 < P-value < 0.0500.010 < P-value < 0.0250.005 < P-value < 0.0100.0005 < P-value < 0.005P-value < 0.0005
Conclusion
Reject the null hypothesis. There is sufficient evidence that ρ > 0.Reject the null hypothesis. There is insufficient evidence that ρ > 0. Fail to reject the null hypothesis. There is sufficient evidence that ρ > 0.Fail to reject the null hypothesis. There is insufficient evidence that ρ > 0.
(e) If someone had x = 10 job changes, what does the least-squares line predict for y, the annual salary? (Round your answer to two decimal places.)
thousand dollars
(f) Find Se. (Round your answer to two decimal places.)
Se =
(g) Find a 90% confidence interval for the annual salary of an individual with x = 10 job changes. (Round your answers to two decimal places.)
lower limit | thousand dollars |
upper limit | thousand dollars |
(h) Test the claim that the slope β of the population least-squares line is positive at the 5% level of significance. (Round your test statistic to three decimal places.)
t =
Find or estimate the P-value of the test statistic.
P-value > 0.2500.125 < P-value < 0.250 0.100 < P-value < 0.1250.075 < P-value < 0.1000.050 < P-value < 0.0750.025 < P-value < 0.0500.010 < P-value < 0.0250.005 < P-value < 0.0100.0005 < P-value < 0.005P-value < 0.0005
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