4..Solve the problem using anova 4. The summary information for the voltages of three different designs of light fixturesare provided below.Sample size Sample mean Sample SD46.68Fixture107.1623847.7158.245.598.4310Table 2: Light fixture voltages.(a) Using a = 0.05, decide whether the true average voltage differs for the three lightfixture designs.(b) Investigate the pairwise differences, if exist, through multiple comparisons.

Hypothesis testing : Hypothesis testing is a type of statistical inference that uses sample data to…

Answered: 4. The summary information for 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

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4. In multiple regression, why do we prefer our IVs to be uncorrelated with each other (i.e., we want rx, x, to be 0)?
You are a researcher who wants to know what the mean (µ) level of anxiety would be for the whole population if they were all receiving a new anti-anxiety therapy. You can’t give the therapy to the whole population, so you give it to a sample, and you get M = 32.1 as the average anxiety level for the sample on the therapy. What is the reason that you can’t just simply assume that µ = 32.1? You didn’t use random assignment Sampling error Descriptive statistics Inferential statistics
1
1. Three different treatments are given to 3 groups of patients with anemia. Increase in Hb% level was noted after one month and is given below. Test whether the difference in improvement in 3 groups is significant or not? Group A 3 1 2 0 1 2 2 Group B 3 2 2 3 1 3 2 Group C 3 4 5 4 2 2 4
5. Is ultrasound a reliable method for determining the gender of an unborn baby? The data on 100 births is given below. a. What is P(F)? Write your answer as a decimal. b. What is P(F|Pm)? Round your answer to 4 decimal places. c. True or False: F and Pm are independent. Write either TRUE or FALSE
Q8. (i) Suppose the manufacturer of a new drug wants to test H,: 0 = 0.8 versus H,: 0 = 0.6 where 0 is true proportion of patients cured by the drug. His test statistic is x, the number of successes (cures) in n = 20 trials, and he will accept Ho if x >16; otherwise he will reject it. Find a and ß. (ii) Now suppose we wish to test Ho: 0 2 0.8 versus H;: 0 < 0.8. Using some selective values of 0 [ eg 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9] to make a table of the Probabilities of type I error, type II error and the power function [Probability of rejecting Ho]. Use the table draw a plot of the power function 1(8).
By how many times does the sample size have to be increased to decrease the margin of error by a factor of 1 to decrease the margin of error by a factor of 51 The sample size must be increased by a factor of (Type a whole number.) What is the general relationship, if any, between the sample size and the margin of error? OA. Increasing the sample size by a factor M results in the margin of error decreasing by a factor of M2 O B. Increasing the sample size by a factor M results in the margin of error decreasing by a factor of 1 M 1 OC. Increasing the sample size by a factor M results in the margin of error decreasing by a factor of VM O D. There is no relationship between the sample size and the margin of error.
4. Areal estate company wants to study the relationship between Home price in OMR 1000) and the following variables: Floor size (in 100 square feet (X 1 ) , Type of Heating (X 2 =1 if electricity and X 2 =0,if Gas) , Location of home (X 3 =1 if in town and X 3 =0 , if in village). Use this to answer the following questions: Then the degrees of freedom of Fstatistic for finding critical value is A . r 1 =3,r 2 =10 B. None C. r 1 =11,r 2 =3 D. r 1 =3,r 2 =11 E. r 1 =10; r 2 =3

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