Answered: )What happens to the mean if we add 5…

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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1)What happens to the mean if we add 5 to each number in a data set?Group of answer choices

Can't tell without knowing the actual numbers.

The mean will stay the same

The mean will increase with 5

In a large city school system with 20 elementary schools, the school board is considering the adoption of a new policy that would require elementary students to pass a test in order to be promoted to the next grade. The PTA wants to find out whether parents agree with this plan. Listed below are some of the ideas proposed for gathering data. What kind of sampling method is involved in each?

Group of answer choices

Randomly select one of the elementary school and contact every parent by phone.

Randomly select 20 parents from each school and send them the survey.

Go through the districts enrollment records, selecting every 40th parent. PTA volunteers will go to those homes to interview the people chosen.

Use a random number generator to choose 200 students from the districts enrollment records.

3) For a right-skewed histogram, which of the following statement is correct?

Group of answer choices

Median < Mean

Mean < Median

Mean = Median

4) Which of the following measured of spread is not effected by outliers.

Group of answer choices

Standard deviation

Range

IQR

5) If the mean and median for a data set are all the same, the data's distribution is

Group of answer choices

skewed right

symmetric

skewed left

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

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