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A pollster for a congressional candidate would like to determine the proportion of the voting population who prefers this candidate at this time over the competition. He would like to estimate with .05 of the true proportion with a confidence level of 90%. What is the sample size needed?
a) 171
b) 271
c) 298
Risks and Odds in Everyday Life, James Burke claims that about 70 percent of all single men would welcome a woman taking the initiative in asking for a date. A random sample of 20 single men was asked if they would welcome a woman taking the initiati..
Calculate the correlation and the regression equation and plot the data in the space provided.
Determine expected cell counts if null hypothesis is true and show them in a two-way table. Determine the chi-square() statistic?
Given the same significance level, a ________ value of t will be required to reject the null hypothesis compared to the value of z required for rejection.
Using multiple linear regression, compute the regression equation for the following data in Excel.
For the past 20 years, the high temperature on April 15th has averaged (j = 62 degrees with a standard deviation of a = 8. Last year, the high temperature was 66 degrees.
ABC Corporation has been using statistical process control for several months.
Calculate and interpret standard error of estimate se and coefficient of determination R2 for these data.
In a binomial distribution n = 8 and π = 0.2. Determine the probabilities of the following events.
Part 1. What is the appropriate distribution for such data? Part 2. Is this lot anomalous?
Illustrate is the range of values for a coefficient of correlation. Illustrate degree of relationship do values of the correlation coefficient (r)with magnitudes close to 1.00 indicate.
Employer wishes to interview only those applicants who score in top 15%. What must cut-off score be for interviews?
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