MATLAB: An Introduction with Applications
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.)
x =  
y =  
b =  
ŷ =   +   x

(b) Draw a scatter diagram displaying the data. Graph the least-squares line on your scatter diagram. Be sure to plot the point (x, y).
   
   

(c) Find the sample correlation coefficient r and the coefficient of determination. (Round your answers to three decimal places.)
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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