Fitting a straight line to a set of data yields the following prediction line. Complete (a) through (c) below. Yi=4+9Xi a. Interpret the meaning of the Y-intercept, b0. Choose the correct answer below. A. The Y-intercept, b0=9, implies that when the value of X is 0, the mean value of Y is 9. B. The Y-intercept, b0=4, implies that when the value of X is 0, the mean value of Y is 4. C. The Y-intercept, b0=4, implies that for each increase of 1 unit in X, the value of Y is expected to increase by 4 units. D. The Y-intercept, b0=4, implies that the average value of Y is 4. b. Interpret the meaning of the slope, b1. Choose the correct answer below. A. The slope, b1=9, implies that for each increase of 1 unit in X, the value of Y is expected to increase by 9 units. B. The slope, b1=4, implies that for each increase of 1 unit in X, the value of Y is expected to increase by 4 units. C. The slope, b1=9, implies that for each increase of 1 unit in X, the value of Y is expected to decrease by 9 units. D. The slope, b1=9, implies that the average value of Y is 9. c. Predict the mean value of Y for X=2. Yi=enter your response here (Simplify your answer.)

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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Related questions

Question

Fitting a straight line to a set of data yields the following prediction line. Complete (a) through (c) below.

Yi=4+9Xi

a. Interpret the meaning of the Y-intercept,

b0.

Choose the correct answer below.

The Y-intercept,

b0=9,

implies that when the value of X is 0, the mean value of Y is 9.

The Y-intercept,

b0=4,

implies that when the value of X is 0, the mean value of Y is 4.

The Y-intercept,

b0=4,

implies that for each increase of 1 unit in X, the value of Y is expected to increase by

units.

The Y-intercept,

b0=4,

implies that the average value of Y is 4.

b. Interpret the meaning of the slope,

b1.

Choose the correct answer below.

The slope,

b1=9,

implies that for each increase of 1 unit in X, the value of Y is expected to increase by

units.

The slope,

b1=4,

implies that for each increase of 1 unit in X, the value of Y is expected to increase by

units.

The slope,

b1=9,

implies that for each increase of 1 unit in X, the value of Y is expected to decrease by

units.

The slope,

b1=9,

implies that the average value of Y is 9.

c. Predict the mean value of Y for X=2.

Yi=enter your response here

(Simplify your answer.)

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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