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In a survey of 2898 ?adults, 1471 say they have started paying bills online in the last year.
Construct a? 99% confidence interval for the population proportion. Interpret the results.
A sample of n= 16 scores has a mean of M = 45 and SS = 960. Calculate the sample standard deviation (s) and the estimated standard error for the sample means (SM).
a hospital conducted a study of waiting time in its emergencyroom. the hospital has a main campus and three satellite
Perform a Wilcoxon rank sum test on the following data on the length of time that it took to perform two types of operations.
Compute a 99% confidence interval for μ if the average for randomly selected 20 heat pumps is 4.85 and the standard deviation of all heat pumps is known to be 0.75.
The Employee Benefit Research Institute reports that 69% of workers reported that they and/or their spouse had saved some money for retirement.
airlines sometimes overbook flights. suppose that for a plane with 50 seats 55 passengers have tickets. define the
Standard deviation of 8.3 minutes. Assuming normality, at the a = .05 level, is there enough evidence to show the mean oil change time is different?
What two assumptions must be met when you are using the z test to test differences between two means? Can the sample standard deviations s1 and s2 be used in place of the population standard deviations σ1 and σ2?
The correlation coefficient was .56 (and statistically significant). Does given finding provide support for the idea that playing violent video games increases aggression? Explain your answer.
During the sharp increase in gasoline prices in the summer of the year 2006, oil companies claimed that the average price of unleaded gasoline with minimum.
with a mean of 74 and standard deviation of 16. what is the proportion of healthy people will have cbf readings between
read and answer the following questions for this onelets talk a little bit about accuracy. when you fit a
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