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A random sample of 16 values is drawn from a mound-shaped and symmetric distribution. The sample mean is 14 and the sample standard deviation is 2. Use a level of significance of 0.05 to conduct a two-tailed test of the claim that the population mean is 13.5.
(a) Is it appropriate to use a Student's t distribution? Explain. How many degrees of freedom do we use?
(b) What are the hypotheses?
(c) Compute the t value of the sample test statistic.
(d) Estimate the P-value for the test.
(e) Do we reject or fail to reject H0?
(f) Interpret the results.
GPA and IQ. Do you believe that the grade point average of a college student is correlated with the student's intelligence quotient (IQ)?
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Assume that each of the following studies cannot be analyzed using a parametric procedure. For each of the following studies (below), indicate the appropriate nonparametric procedure, and explain why you chose it.
(i) What is the probability of rolling a 5, given that an odd number turns up. (ii) What is the probability of rolling an even number
A human resource director wishes to develop an interval estimate for test scores on an exam. She wants the interval to be within 5 points with a 95% confidence
The mean and variance of the number of matches. Let Sill be the number of matches obtained by distributing, 1 to an urn, M balls, numbered
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A credit card company uses the average daily balance method to calculate its finance charges. Find the finance charge for the month of August (31 days) if the average daily balance for August is $658.58. The annual interest rate is 18%.
a social researcher believes the color red causes mens attraction to women to increase as well as womens attraction to
Find the? 95% confidence interval for the population proportion favoring stricter gun control laws. Round to four decimal places.
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