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 O 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

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 O 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

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

Hi, I would appreciate if you could help me with the following questions please.

**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:

| Statistic | Value |
|-------------------------------------------------------------|---------|
| $\bar{x}$ (Mean of X) | 1,606 |
| $\bar{y}$ (Mean of Y) | 909 |
| $\sum_{i=1}^{n} (x_i - \bar{x})^2$ (Sum of squared deviations of X) | 1,222,691 |
| $\sum_{i=1}^{n} (y_i - \bar{y})^2$ (Sum of squared deviations of Y) | 130,988 |
| $\sum_{i=1}^{n} (x_i - \bar{x})(y_i - \bar{y})$ (Sum of products of deviations) | 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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