Region/Politics Liberal Conservative Moderate Total South 94 58 75 227 North 90 75 56 221 Middle 95 59 65 219 Total 279 192 196 667 The table shows a random sample of voters in three regions of a country. At a 10% Level of Significance, test the claim that region and political affiliation are independent. 1. The hypotheses are : O Ho:Region and political affiliation are dependent Ha:Region and political affiliation are independent O Ho:Region and political affiliation are independent Ha:Region and political affiliation are dependent 2. This is a O twoO leftO right tailed test; d.f. = 3a. The STS (to 2 decimals) is x 3b. The P-value (to 3 decimals)% =

Region/Politics Liberal Conservative Moderate Total South 94 58 75 227 North 90 75 56 221 Middle 95 59 65 219 Total 279 192 196 667 The table shows a random sample of voters in three regions of a country. At a 10% Level of Significance, test the claim that region and political affiliation are independent. 1. The hypotheses are : O Ho:Region and political affiliation are dependent Ha:Region and political affiliation are independent O Ho:Region and political affiliation are independent Ha:Region and political affiliation are dependent 2. This is a O twoO leftO right tailed test; d.f. = 3a. The STS (to 2 decimals) is x 3b. The P-value (to 3 decimals)% =

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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This question refers to excavations at a national monument. One question the archaeologists asked was: Is raw material used by prehistoric Indians for stone tool manufacture independent of the archaeological excavation site? Two different excavation sites gave the information in the following table. Use a chi-square test with 5% level of significance to test the claim that raw material used for construction of stone tools and excavation site are independent. Stone Tool Construction Material Material Site B Row Total Basalt 768 547 1315 Obsidian 101 94 195 Pedernal chert Other Column Total 536 499 1035 179 1496 1228 2724 (a) What is the level of significance? State the null and alternate hypotheses. O Ho: Stone tool material and site are independent. H: Stone tool material and site are not independent. O Ho: Stone tool material and site are not independent. H: Stone tool material and site are independent. O Ho: Stone tool material and site are independent. H: Stone tool material and…
After a large fund drive to help the Boston City Library, the following information was obtained from a random sample of contributors to the library fund. Using a 1% level of significance, test the claim that the amount contributed to the library fund is independent of ethnic group. Number of People Making Contribution Ethnic Group $1-50 $51-100 $101-150 $151-200 Over $200 Row Total A 80 65 56 35 15 251 B 94 53 67 26 24 264 C 70 57 65 43 31 266 D 105 82 70 50 33 340 Column Total 349 257 258 154 103 1121 1. Find the value of the chi-square statistic for the sample. (Round the expected frequencies to at least three decimal places. Round the test statistic to three decimal places.) 2. What are the degrees of freedom?
1) A 2010 survey asked 827 randomly sampled registered voters in California "Do you support? Or do you oppose? Drilling for oil and natural gas off the coast of California? Or do you not know enough to say?" Below is the distribution of responses, separated based on whether or not the respondent graduated from college. College Grad Yes No Support Oppose Do not know 154 132 180 126 104 131 Total 438 389 Conduct a hypothesis test to determine if the data provide strong evidence that the proportion of college graduates who do not have an opinion of this issue is different than that of non-college graduates. a) Write the hypotheses for this test. Ho : Pgrad – Pnongrad = НА: Рgrad - Рпоngrad b) What is the p-value? (Round to four decimal places, if necessary. If '
A study was conducted to determine the proportion of people who dream in black and white instead of color. Among 303 people over the age of 55, 79 dream in black and white, and among 300 people under the age of 25, 18 dream in black and white. Use a 0.01 significance level to test the claim that the proportion of people over 55 who dream in black and white is greater than the proportion for those under 25. Complete parts (a) through (c) below. a. Test the claim using a hypothesis test. Consider the first sample to be the sample of people over the age of 55 and the second sample to be the sample of people under the age of 25. What are the null and alternative hypotheses for the hypothesis test? O A. Ho: P₁ = P₂ H₁: P₁ P2 O D. Ho: P₁ #P₂ H₁: P₁ = P2 Identify the test statistic. z=0 Z= (Round to two decimal places as needed.) Identify the P-value. P-value= (Round to three decimal places as needed.) What is the conclusion based on the hypothesis test? the significance level of a = 0.01, so…
A forestry official is comparing the causes of forest fires in three regions. The following table shows the causes of fire for 100 randomly selected recent fires in these three regions. Lighting Accident Arson Others Region A 12 8 4 8 Region B 5 11 14 5 Region C 4 12 2 15 Test at a 5% significance level whether causes of fire and regions of fires are related.
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A forestry official is comparing the causes of forest fires in three regions. The following table shows the causes of fire for 100 randomly selected recent fires in these three regions. (in photo) Test at a 5% significance level whether causes of fire and regions of fires are related.
Random digit dialing telephone surveys used to exclude cell phone numbers. If the opinions of people who have only cell phones differ from those of people who have landline service, the poll results may not represent the entire adult population. The Pew Research Center interviewed separate random samples of cell-only and landline telephone users who were less than 30 years old. Here’s what the Pew survey found about how these people describe their political party affiliation. Do we reject, or fail to reject, the null hypothesis?
Is there an association between hair color and body type? The table below shows the results of a researcher's observations of randomly selected people. Frequencies of Hair Colors for Various Body Types Blonde Brunette Red Head 71 80 96 108 55 115 46 91 Short and Slender Short and Pudgy Tall and Slender Tall and Heavy What can be concluded at the o= 0.01 significance level? 53 74 69 63
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