Answered: A stock analyst wondered whether the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Concept explainers

Question

A stock analyst wondered whether the mean rate of return of financial, energy, and utility stocks differed over the past 5 years. He obtained a simple random sample of eight companies from each of the three sectors and obtained the 5-year rates of return shown in the accompanying table (in percent). Complete questions below.

Click the icon to view the data table.

Financial	Energy	Utilities

10.73	12.89	11.88
15.05	13.91	5.76
17.21	6.33	13.67
5.07	11.23	9.90
19.50	18.79	3.95
8.16	20.73	3.44
10.45	9.60	7.11
6.75	17.40	15.70

(a) State the null and alternative hypotheses. Choose the correct answer below.

H0: μfinancial=μenergy=μutilities

and H1: at least one of the means is different

H0: μfinancial=μenergy=μutilities

and H1: μfinancial<μenergy<μutilities

H0: at least one of the means is different

and H1: μfinancial=μenergy=μutilities

H0: μfinancial=μenergy

and H1: the means are different

(b) Normal probability plots indicate that the sample data come from normal populations. Are the requirements to use the one-way ANOVA procedure satisfied?

No, because the largest sample standard deviation is more than twice the smallest sample standard deviation.

Yes, because there are

k=3

simple random samples, one from each of k populations, the k samples are independent of each other, and the populations are normally distributed and have different variances.

No, because there are

k=3

simple random samples, one from each of k populations, the k samples are independent of each other, and the populations are normally distributed and have the same variance.

Yes, because there are

k=3

simple random samples, one from each of k populations, the k samples are independent of each other, and the populations are normally distributed and have the same variance.

α=0.05

level of significance?

Use technology to find the F-test statistic for this data set.

F0=nothing

(Round to two decimal places as needed.)

Determine the P-value and state the appropriate conclusion below.

Since the P-value is

nothing,

there

▼

is not

enough evidence to reject the null hypothesis. Thus, we

▼

can

cannot

conclude that the mean rates of return are different at the

α=0.05

level of significance.

(Round to three decimal places as needed.)

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

Expert Solution

Trending now

This is a popular solution!

Step by step

Solved in 2 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

$Point Estimation, Limit Theorems, Approximations, and Bounds$

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.

Similar questions