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Chapter 3 Descriptive Statistics: Numerical Measures January 23, 2013). The following data show the number of hours of sleep attained during a recent night for a sample of 20 workers. 9. 10 5 6. 6. 5. 8 7 8 6 8 9. 10 8. 9 6. What is the mean number of hours of sleep for this sample? What is the variance? Standard deviation? a.

Chapter 3 Descriptive Statistics: Numerical Measures January 23, 2013). The following data show the number of hours of sleep attained during a recent night for a sample of 20 workers. 9. 10 5 6. 6. 5. 8 7 8 6 8 9. 10 8. 9 6. What is the mean number of hours of sleep for this sample? What is the variance? Standard deviation? a.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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Chapter 3 Descriptive Statistics: Numerical Measures January 23, 2013). The following data show the number of hours of sleep attained during a recent night for a sample of 20 workers. 10 9. 5. 8 7 8 6 8 9. 6. 10 8. 9. What is the mean number of hours of sleep for this sample? What is the variance? Standard deviation? a. b. 66. A study of smartphone users shows that 68% of smartphone use occurs at home and a user spends an average of 410 minutes per month using a smartphone to interact with other people (Harvard Business Review, January-February 2013). Consider the following data indicating the number of minutes in a month spent interacting with others via a smart- phone for a sample of 50 smartphone users. 353 458 404 394 416 437 430 369 448 430 431 469 446 387 445 354 468 422 402 360 444 424 441 357 435 461 407 470 413 351 464 374 417 460 352 445 387 468 368 430 384 367 436 390 464 405 372 401 388 367 What is the mean number of minutes spent interacting with others for this sample? How does it compare to the mean reported in the study? What is the standard deviation for this sample? a. b. Are there any outliers in this sample? C. 57. Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes. 33 25 29 32 41 34 Public Transportation: 28 29 Automobile: 32 37 29 31 33 32 34 30 31 32 35 33 a Compute the sample mean time to get to work for cach method. b. Compute the sample standard deviation for each method. On the basis of your results from parts (a) and (b), which method of transportation should be preferred? Explain. d Develop a boxplot for each method. Does a comparison of the boxplots support your C.
Transcribed Image Text:Chapter 3 Descriptive Statistics: Numerical Measures January 23, 2013). The following data show the number of hours of sleep attained during a recent night for a sample of 20 workers. 10 9. 5. 8 7 8 6 8 9. 6. 10 8. 9. What is the mean number of hours of sleep for this sample? What is the variance? Standard deviation? a. b. 66. A study of smartphone users shows that 68% of smartphone use occurs at home and a user spends an average of 410 minutes per month using a smartphone to interact with other people (Harvard Business Review, January-February 2013). Consider the following data indicating the number of minutes in a month spent interacting with others via a smart- phone for a sample of 50 smartphone users. 353 458 404 394 416 437 430 369 448 430 431 469 446 387 445 354 468 422 402 360 444 424 441 357 435 461 407 470 413 351 464 374 417 460 352 445 387 468 368 430 384 367 436 390 464 405 372 401 388 367 What is the mean number of minutes spent interacting with others for this sample? How does it compare to the mean reported in the study? What is the standard deviation for this sample? a. b. Are there any outliers in this sample? C. 57. Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes. 33 25 29 32 41 34 Public Transportation: 28 29 Automobile: 32 37 29 31 33 32 34 30 31 32 35 33 a Compute the sample mean time to get to work for cach method. b. Compute the sample standard deviation for each method. On the basis of your results from parts (a) and (b), which method of transportation should be preferred? Explain. d Develop a boxplot for each method. Does a comparison of the boxplots support your C.
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