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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
A university found that 20 percent of its students withdraw without completing the introductory statistics course. 20 students registered for a section of the course this term.
Use this information to compute a 95% confidence interval for average number of credit cards carried by students.
The Kruskal-Wallis rank test is a nonparametric replacement - The Wilcoxon rank sum test tests a null hypothesis
Where should the warranty limits be set so that only 10% of the TVs need repairs at the manufacturer's expense?
The ideal number of children. "What do you think is the ideal number of children for a family to have?" A Gallup Poll asked this question of 1016 arbitrarily chosen adults. Almost half (49%) thought two children was idea suppose that p = 0.49 is e..
Below are the sample times in minutes. At the .05 significance level, can we conclude that there is a difference in their mean times?
Interpret the correlation between each set of variables.
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
Compute an F-statistic for each linear construct and determine its significance. Also, state what questions each of these contrasts address.
A uniform probability distribution is a continuous probability distribution where the probability that the random variable assumes a value in any interval of equal length is.
Determine the sample size needed in order to be 99% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all current accounts for this company.
Determine the variance of X? (Illustrate your computation either in Table or in Equation form)
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