Answered: Americans tend to dine out multiple…

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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Americans tend to dine out multiple times per week. The number of times a sample of 20 families dined out last week provides the following data.

7	2	5	4	8	4	1	4	1	4
4	1	2	5	1	1	6	6	3	2

(a)

Compute the mean and median.

meanmedian

(b)

Compute the first and third quartiles.

first quartilethird quartile

(c)

Compute the range and interquartile range.

rangeinterquartile range

(d)

Compute the variance and standard deviation. (Round your answers to two decimal places.)

variancestandard deviation

(e)

The skewness measure for these data is 0.41. Comment on the shape of this distribution.

The skewness measure of 0.41 indicates the data are somewhat ---Select--- skewed to the right symmetrical skewed to the left .

Is it the shape you would expect? Why or why not?

---Select--- Yes No , most people dine out a relatively few times per week and a few families dine out very frequently, therefore we would expect the data to be ---Select--- negatively skewed symmetrical positively skewed .

(f)

Compute the lower and upper limits

lower limitupper limit

Do the data contain outliers?

---Select--- No Some All values in the data are less than the lower limit or greater than the upper limit, so there are ---Select--- no some many outliers.

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