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It has been shown that people drive 5 - 10mph faster than the posted speed limit on a highway. It has been thought that changing the speed limit from 65mph to 70mph would not increase the "typical" speed of 70 - 75mph. On one stretch of a highway the speed limit was increase from 65mph to 70mph. If the population mean speed on this stretch of the highway has been 68mph with a standard deviation of 5mph, what is the sample size needed to detect an increase in speed on this stretch of the highway of 10mph? Let alpha = 0.02 and beta = 0.05
Write the null and alternative hypotheses:
Draw the curves and label alpha and beta:
Calculate the sample size:
What fraction of the calls last between 4.2 and 5 minutes?
A recent study of 75 workers found that 53 people rode the bus to work each day. Find the 95 percent confidence interval of the proportion of all workers who rode the bus to work.
If the average tax payer who makes $140,000 per year owes the government $18,200 with a standard deviation of $1500, and the IRS receives a 1040 tax documents from a customer who earned $140,000 that claims he only owes $12,000, should the IRS sus..
the time between the arrival of electronic messages at your computer is exponentially distributed with a mean of two
Critically discuss some concepts behind variance analysis? Why is it important to test for variances in your data? Explain. How is variance analysis used in health care administration?
need answers to questions on test.the file is attached with all the questions would like answers for all of
In the year 2006 the mean fare to fly from Charlotte, North Carolina, to Seattle, Washington, on a discount ticket was $267. A random sample of round-trip discount fares on this route last month gives:
when an events probability depends on the likelihood of another event the probability is aa conditional probability.b
The following sample data were obtained from three populations where the variances were not equal, and you wish to compare the populations.
1. a new diagnostic test has been developed to diagnose disease y. the new test was compared to the standard diagnostic
On a test with a population mean of 75 and standard deviation equal to 16, if the scores are normally distributed, what percentage of scores fall below a score of 83.8?
in order to determine an interval for the mean of a population with unknown standard deviation a sample of 61 items is
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