1. A researcher believes that average dwelling house size in one region of the country has declined in thelast five years. From property records he took a random sample of 50 houses from the population(Population 1) of all houses in service this year and a random sample of 50 houses from the population(Population 2) of all houses in service five years ago, with the following results:now ni = 50ã1 = 2392S1 = 325past n2 = 50ã2 = 2434s2 = 336The populations may be assumed to be normally distributed with equal standard deviations. We wishto test whether the mean house size now is less than what it was five years ago, at the 10% level ofsignificance.Which of the following formula should be used to calculate the standardized test statistic?(a) Z =(T1-F2)- Doni(b) Z =(E1-32) --Do(c) T =(#1-E2)-Do(n1-1)a+(n2-1)s?(1,1(d) T =d-Dosp/Vn(e) Z = 1-H0

The sample standard deviation is given so we will use two sample t test statistic The correct standardized test statistic formula is in option C Hence option c is the correct answer

Answered: last five years. From property records…

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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just question 18 please
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Just question 19 please
There are many situations in which we want to compare means from populations having standard deviations that are equal. This method applies even if the standard deviations are known to be only approximately equal. Consider a report regarding average incidence of fox rabies in two regions. For region I, n1 = 16, x1 ≈ 4.73, and s1 = 2.84 and for region II, n2 = 15, x2 ≈ 3.93, and s2 = 2.45. The two sample standard deviations are sufficiently close that we can assume ?1 = ?2. Use the method of pooled standard deviation to consider the report, testing if there is a difference in population mean average incidence of rabies at the 5% level of significance. (Round your answer to three decimal places.) t =
Solve question 9, Part A, Part B and Part C only.
Is the difference between the mean annual salaries of statisticians in Region 1 and Region 2 more than $4000? To decide, you select a random sample of statisticians from each region. The results of each survey are shown to the right. At a = 0.10, what should you conclude? Region 1 X1 = $67,700 01 = $8875 Region 2 X2 = $61,000 02 = $9250 n1 = 48 n2 = 44 Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Choose the correct answer below. O A. Reject Ho. At the 10% significance level, there is sufficient evidence to support the claim that the difference between the mean annual salaries is more than $4000. O B. Fail to reject Ho. At the 10% significance level, there is sufficient evidence to support the claim that the difference between the mean annual salaries is more than $4000. OC. Reject Ho. At the 10% significance level, there is insufficient evidence to support the claim that the difference between…

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