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A questionnaire on the issue of substance abuse problems was mailed to all XYZ city businesses. Of the 72 businesses that responded to the survey, 54 admitted that they had employees whose performance was affected by substance abuse.
(a) Using the sample data, compute a 95% confidence interval for the proportion of all XYZ city businesses with substance problems.
(b) What is the margin of error? Explain its meaning.
(c) Interpret the confidence interval in (a).
a couple wishes to borrow money using the equity in their home for collateral. a loan company will loan them up to 70
Test the hypothesis. Will you reject or not reject the null hypothesis at α = 0.05
Compare and contrast how the psychologist as a detective (a researcher) solves a problem to how a non-researcher solves a problem.
You choose random sample of 50 cans, and mean amount of paint per 1-gallon can is 0.995 gallon. Is there evidence that mean amount is different from 1.0 gallon (use α=0.01).
The shirts are sold in packages of 10. Find the probability that in one randomly selected package:
approximately 21 of americans over the age of 18 smoke. to test this claim a survey was conducted collecting data on
What are the variables and units in this regression?- What units does the slope have?- Do you think the slope is positive or negative? Explain.
Cross- compilation assumes that a compiler for language X exists on some machine. When the first compiler for a new language is created, this assumption doesn't hold. In this situation, a bootstrapping approach can be taken.
Compute the 95% confidence interval on theproportion of times this person can predict coin flips correctly. Whatconclusion can you draw about this test of his ability to predict the future - Find the confidence interval on the population mean.
The boss asks the secretary to stuff n letters into envelopes forgetting to mention that he has been adding notes to the letters and in the process.
a. What is the independent variable, and what are its levels? What is the dependent variable? b. Is this a between-groups or within-groups design? Explain.
The report needs to be short report format - 1500 + 10% word report format - Word .doc or .docx. Title page, executive summary, table of contents
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