Please answer the following multiple choice questions :) 1. Given the least squares regression line y^ = 7 + 0.2x A. as x increases by 0.2 unit, so does y by 1 unit on average. B. as y increases by 1 unit, so does x by 0.2 units on average. C. as x increases by 1 unit, so does y by 0.2 units on average. D. as y increases by 0.2 unit, so does x by 1 unit on average. 2. A researcher wishes to determine whether the rate of water flow (in liters per second) over an experimental soil bed can design be used to predict the amount of eroded soil (in kilograms). In this study, the response variable is the A. amount of eroded soil B. depth of the soil bed C. size of the soil bed D. rate of water flow 3. In which of the following scenarios will conducting a two-sample t-test for means be more appropriate? A. To test if there is a difference between the mean annual income of Ontarians and a known national mean. B. To test if the proportion of low-income families is higher than that of high-income families in Ontario. C. To test if there is a difference between the mean annual income of husbands and that of their wives in Canada. D. To test if there is a difference between the mean annual income of male Ontarians and that of female Ontarians.

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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Please answer the following multiple choice questions :)

1. Given the least squares regression line y^ = 7 + 0.2x
A. as x increases by 0.2 unit, so does y by 1 unit on average.
B. as y increases by 1 unit, so does x by 0.2 units on average.
C. as x increases by 1 unit, so does y by 0.2 units on average.
D. as y increases by 0.2 unit, so does x by 1 unit on average.

2. A researcher wishes to determine whether the rate of water flow (in liters per second) over an experimental soil bed can design be used to predict the amount of eroded soil (in kilograms). In this study, the response variable is the
A. amount of eroded soil
B. depth of the soil bed
C. size of the soil bed
D. rate of water flow

3. In which of the following scenarios will conducting a two-sample t-test for means be more appropriate?
A. To test if there is a difference between the mean annual income of Ontarians and a known national mean.
B. To test if the proportion of low-income families is higher than that of high-income families in Ontario.
C. To test if there is a difference between the mean annual income of husbands and that of their wives in Canada.
D. To test if there is a difference between the mean annual income of male Ontarians and that of female Ontarians.

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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