Two neurologists examined 55 magnetic resonance imagings(MRIs) for evidence of brain tumors. As shown in the tablebelow, the neurologists read each MRIs as either positive ornegative for brain tumors.NEUROLOGIST 1TOTALPOSITIVENEGATIVEPOSITIVE20626NEUROLOGIST2NEGATIVE141529TOTAL342155Compute for the percent agreement observed, using all of thecells in the table.

Percentage of aggreement observed is given by, X= (a+d)*100/(a+b+c+d) Positive Negative Total…

Answered: Two neurologists examined 55 magnetic…

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.5: Interpreting Data

Problem 1C

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The American Association of Individual Investors (AAII) conducts a weekly survey of its members to measure the percent who are bullish, bearish, and neutral on the stock market for the next six months. For the week ending March 27, 2019, the survey results showed 33.2% bullish, 39.6% neutral, and 27.2% bearish. Assume these results are based on a sample of 300 AAII members.
A study showed that 66% of supermarket shoppers believe supermarket brands to be as good as national name brands. To investigate whether this result applies to its own product, the manufacturer of a national name-brand ketchup asked a sample of shoppers whether they believed that supermarket ketchup was as good as the national brand ketchup. a. Formulate the hypotheses that could be used to determine whether the percentage of supermarket shoppers who believe that the supermarket ketchup was as good as the national brand ketchup differed from 66%. : - Select your answer -greater than or equal to 0.66 greater than 0.66 less than or equal to 0.66 less than 0.66 equal to 0.66 not equal to 0.66 Item 1: - Select your answer -greater than or equal to 0.66 greater than 0.66 less than or equal to 0.66 less than 0.66 equal to 0.66 not equal to 0.66 Item 2 b. If a sample of 100 shoppers showed 53 stating that the supermarket brand was as good as the national brand, what is the p-value (to 4…
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In March 2015, the Public Policy Institute of California (PPIC) surveyed 7525 likely voters living in California. PPIC researchers find that 68 out of 200 Central Valley residents approve of the California Legislature and that 156 out of 300 Bay Area residents approve of the California Legislature. PPIC is interested in the difference between the proportion of Central Valley and Bay Area residents who approve of the California Legislature. PPIC researchers calculate that the standard error for the proportion of Central Valley residents who approve of the California Legislature minus Bay Area residents who approve of the California Legislature is about 0.044. Find the 95% confidence interval to estimate the difference between the proportion of Central Valley and Bay Area residents who approve of the California Legislature. (-0.224, -0.136) (0.094, 0.266) (-0.266, -0.094) (0.136, 0.224)
A university dean is interested in determining the proportion of students who recieve some sor of financial aid. Rather than examine the records for all students, the dean randomly selects 200 students and finds that 118 of them are receiving financial aid. If the dean wanted to estimate the proportion of all students receiving financial aid to within 4% with 90% reliabilty, how many students would need to be sampled?
In a study to estimate the proportion of residents in a certain city and its suburbs who favor the construction of a nuclear power plant, it is found that 63 of 100 urban residents favor the construction while only 59 of 125 suburban residents are in favor. Is there a significant difference between theproportions of urban and suburban residents who favor construction of the nuclear plant? Use 0.01 level of significance
According to a certain government agency for a large country, the proportion of fatal traffic accidents in the country in which the driver had a positive blood alcohol concentration (BAC) is 0.33.Suppose a random sample of 109 traffic fatalities in a certain region results in 47that involved a positive BAC. Does the sample evidence suggest that the region has a higher proportion of traffic fatalities involving a positive BAC than the country at the α=0.05 level of significance?
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In a recent poll, 800 voters were randomly sampled and asked whether they would approve of the building of an incinerator in the state. According to the poll, 450 voters approved and 350 voters disapproved. Is there enough evidence to argue that more than 50 % of the voters support the building of the incinerator? Use a 5 % level of significance.

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