11.| Expand Your Knowledge: Data Transformation In this problem, we explore the effect on the standard deviation of multiplying each data value in a data set by the same constant. Consider the data set 5, 9, 10, 11, 15. Section 3.2 Measures of Variation 105 (a) Use the defining formula, the computation formula, or a calculator to compute s. (b) Multiply each data value by 5 to obtain the new data set 25, 45, 50, 55, 75. Compute s. (c) Compare the results of parts (a) and (b). In general, how does the standard deviation change if each data value is multiplied by a constant c? (d) You recorded the weekly distances you bicycled in miles and computed the standard deviation to be s = 3.1 miles. Your friend wants to know the standard deviation in kilometers. Do you need to redo all the calculations? Given 1 mile = 1.6 kilometers, what is the standard deviation in kilometers?
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
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![11.| Expand Your Knowledge: Data Transformation In this problem, we explore the
effect on the standard deviation of multiplying each data value in a data set by
the same constant. Consider the data set 5, 9, 10, 11, 15.
Section 3.2
Measures of Variation
105
(a) Use the defining formula, the computation formula, or a calculator to
compute s.
(b) Multiply each data value by 5 to obtain the new data set 25, 45, 50, 55, 75.
Compute s.
(c) Compare the results of parts (a) and (b). In general, how does the standard
deviation change if each data value is multiplied by a constant c?
(d) You recorded the weekly distances you bicycled in miles and computed the
standard deviation to be s = 3.1 miles. Your friend wants to know the
standard deviation in kilometers. Do you need to redo all the calculations?
Given 1 mile =
1.6 kilometers, what is the standard deviation in kilometers?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F09ed754b-bbf3-4015-a6a8-71c79259fcf3%2F9e35c842-ef02-41ca-8ffd-a39197c903c3%2Fq76w2d.png&w=3840&q=75)
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