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According to an IRS study, it takes a mean time of 330 minutes for taxpayers to prepare, copy and electronically transfer a 1040 tax form. The standard deviation of this distribution is 80 minutes. A consumer watchdog agency selects a random sample of 40 taxpayers for further study. A. What is the shape, mean(expected value), and standard deviation of the sampling distribution of the sample mean for samples of size 40? B. What is the probability that the sample mean is greater than 350 minutes?
Given the standardized normal distribution (with a mean of 0 and a standard deviation of 1, as in Table E.2), what is the probability that:
The mean yearly amount earned is $40,000 and the standard deviation is $5,000. What percent of the sales representatives earn more than $42,000 per year?
Speed of cars travelling on I-85 in Gaston County is normally distributed with average speed (µ) of 66 MPH and standard deviation (σ) of 8 MPH.
consider the following joint discrete probability mass function pmfpxy 0.1 for xy 11 21 12 and 220.2
What is the standard deviation for the sample proportion? What is the probablily that in this group over 18% of the new cars will be found to have electrical problems?
Show that Q3 is an unbiased estimator for q and if Q1 and Q2 are independent, how should the constant a be chosen in order to minimize the variance of Q3?
Doctors nationally believe that 68% of a certain type of operation are successful. In a particular hospital 47 of these operations were observed and 37 of them were successful. At a = 0.05 is this hospital's success rate different from the nationa..
the traditional view about the normal curve in psychology is that normal curves are 6a rare in nature but often occur
let ft be the probability density function for the time it takes you to drive to school in the morning where t is
Perform a significant test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p-value.
What would happen to the size and the sign of the correlation coefficient if we correlated these two variables? How can researchers work around this issue?
in constructing a confidence interval for the mean the z distribution provides a result nearly identical to the t
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