County who have Covid-19 antibodies. A random sample of 8023 Los Angeles County residents found that 1430 have Covid-19 antibodies. a) Determine the minimum sample size needed to estimate, with 99% confidence, the population proportion of Los Angeles County residents who have Covid-19 antibodies if the estimate must be accurate within 1% of the population proportion. b) Find a 90% confidence interval for the population proportion of Los Angeles County residents who have Covid-19 antibodies. Explain the answer in the context of the problem.

County who have Covid-19 antibodies. A random sample of 8023 Los Angeles County residents found that 1430 have Covid-19 antibodies. a) Determine the minimum sample size needed to estimate, with 99% confidence, the population proportion of Los Angeles County residents who have Covid-19 antibodies if the estimate must be accurate within 1% of the population proportion. b) Find a 90% confidence interval for the population proportion of Los Angeles County residents who have Covid-19 antibodies. Explain the answer in the context of the problem.

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 2006 Statistical Abstract of the United States reports on a survey that asked a national sample of 80,000 American households about pet ownership. Suppose (for now) that one-third of all American households own a pet cat. Still supposing that one-third of all American households own a pet cat, between what two values do you expect 95% of all sample proportions to fall?
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19. A local brewery produces three premium lagers named Half Pint, XXX, and Dark Knight. Of its premium lagers, the brewery bottles 40% Half Pint, 40% XXX, and 20% Dark Knight. In a marketing test of a sample of 80 consumers, 26 preferred the Half Pint lager, 42 preferred the XXX lager, and 12 preferred the Dark Night lager. Using a chi-square goodness-of-fit test, test whether the production of the premium lagers matches these consumer preferences using a .05 level of significance. 19a. Step 2: Compute the df and locate the critical values. df = _______ Critical value = ________
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Do well-rounded people get fewer colds? A study on the Chronicle of Higher Education was conducted by scientist at Carnegie Mellon University, the University of Pittsburgh and the University of Virginia. They found that people who have only a few social outlets get more colds than those who are involved in a variety of social activities. Suppose that of the 276 healthy men and women tested, n1=96 had only a few social outlets and n2=105 were busy with six or more activities. When these people were exposed to a cold virus, the following results were observed: Construct a 99% confidence interval for the difference in the two population proportions.