EXAMPLE 3. Sam is interested in predicting the amount of time it takes him to write a report (minutes) based on its word count. He randomly selects 7 reports and records the amount of time it took him to write each report and the corresponding word count. Given the following table of additional information: |1,606 909 1,222,691 130,988 E„(4 – 2)(y, – 9) 298,909 Identify, in words, the dependent variable. O a. X = a report's word count O b. Y = a report's word count O .Y = amount of time it takes Sam to write a report (minutes) o d. X = amount of time it takes Sam to write a report (minutes) Calculate the standard deviation of X. a. 494.5080 b. 417.9356 c. 390.9429 d. None of the other choices

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Chapter1: Starting With Matlab
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Hi, I would appreciate if you could help me with these questions please.

Thank you so much in advance.

Find the correlation coefficient between X and Y.
a. None of the other choices
b. 0.8410
c. 0.6402
d. 0.7469
What is the direction of the linear association?
a. None of the other choices
b. Weak
c. Strong
d. Moderate
Calculate the coefficient of determination.
a. 0.5579
b. None of the other choices
c. 0.4099
d. 0.7073
Determine the least squares regression equation.
a. ý = 516.3330+0.2445r
b. ý = -2755.8231 + 2.282.r
c. ý = 1383.7785+0.2445r
d. ý
-468.299 + 2.282.r
Transcribed Image Text:Find the correlation coefficient between X and Y. a. None of the other choices b. 0.8410 c. 0.6402 d. 0.7469 What is the direction of the linear association? a. None of the other choices b. Weak c. Strong d. Moderate Calculate the coefficient of determination. a. 0.5579 b. None of the other choices c. 0.4099 d. 0.7073 Determine the least squares regression equation. a. ý = 516.3330+0.2445r b. ý = -2755.8231 + 2.282.r c. ý = 1383.7785+0.2445r d. ý -468.299 + 2.282.r
EXAMPLE 3.
Sam is interested in predicting the amount of time it takes him to write a report (minutes) based on its word count. He randomly selects 7 reports and records the amount of
time it took him to write each report and the corresponding word count. Given the following table of additional information:
1,606
909
|1,222,691
|130,988
E( - 2)(y: - )298,909
Identify, in words, the dependent variable.
a. X = a report's word count
b. Y = a report's word count
c. Y = amount of time it takes Sam to write a report (minutes)
d. X = amount of time it takes Sam to write a report (minutes)
Calculate the standard deviation of X.
a. 494.5080
b. 417.9356
c. 390.9429
d. None of the other choices
Transcribed Image Text:EXAMPLE 3. Sam is interested in predicting the amount of time it takes him to write a report (minutes) based on its word count. He randomly selects 7 reports and records the amount of time it took him to write each report and the corresponding word count. Given the following table of additional information: 1,606 909 |1,222,691 |130,988 E( - 2)(y: - )298,909 Identify, in words, the dependent variable. a. X = a report's word count b. Y = a report's word count c. Y = amount of time it takes Sam to write a report (minutes) d. X = amount of time it takes Sam to write a report (minutes) Calculate the standard deviation of X. a. 494.5080 b. 417.9356 c. 390.9429 d. None of the other choices
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