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The mean clotting time is 7.45 seconds with a standard deviation of 3.6 second. what is the probability that an individuals clotting time will be more than 4 seconds and less than 11? Assume a normal distribution.
A building developer has the opportunity to purchase several acres of land that is divided up into several lots for building single-family homes.
A researcher predicts that watching a film on institutionalization will change students' attitudes about chronically mentally ill patients.
If he were to randomly select 120 corks from the next box, then how many of these corks would John expect to be undersized?
A study to get a quick idea of the medical acceptability of a new aspirin substitute which cannot be dispensed over the counter without prescription.
In testing the difference between two means from two independent populations, the sample sizes do not have to be equal to be able to use the Z statistic.
A random sample of 250 adults in a medium size college town were surveyed and it was found that 110 were regular voters. Estimate the true proportion of regular voters with 90% confidence.
A survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used?
Find the equation of linear regression for the above data and obtain the expected salary for an engineer with 45 years of experience. Round to the nearest $100.
The average speed of greyhound dogs is about 18.8 meters per second. A particular greyhound breeder claims that her dogs are faster than the average greyhound. In a sample of 45 dogs, they ran, on average, 19.2 meters per second with a standard de..
You work at a hospital that has always had about 100 emloyees staffed at night. You think that the number of employees staffed at night has recently decreased and would like to test this claim.
What contingency table test is used to see if there is a difference in the frequency distribution for two different groups?
We wish to create this mean value interval for selling price with 95% confidence level. Find out the best point estimate (average) for selling price. Critical t-value(s) associated with 95% confidence level.
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