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A sample of eight college students revealed they owned the following number of CDs. 52, 76, 64, 79, 80, 74, 66, 69
a. What is the mean number of CDs owned?
b. What is the median number of CDs owned?
c. What is the 40th percentile?
d. What is the range of the number of CDs owned?
e. What is the standard deviation of the number of CDs owned?
Why might a t test not be very useful in this case?
an iq test is designed so that the mean is 100 and the standard deviation is 22 for the population of normal adults.
A local bank wants to install motion detector burglar alarms. Each has a 70% chance of detecting a burglar. If the bank wants to be 99% certain of detecting a burglar how many need to be installed?
Use a 0.05 significance level to test the claim that unfiltered king-size cigarettes have a mean tar content greater than that of filtered 100 mm cigarettes.
In order to test the effectiveness of a drug called XZR designed to reduce cholesterol levels, 9 heart patients' cholesterol levels are measured before they are given the drug.
An expert witness in a case of alleged racial discrimination in a state university school of nursing introduced a regression of the determinants of Salary of each professor for each year during an 8-year period (n = 423) with the following results, w..
Research has shown that losing even one night's sleep can have a significant effect on performance of complex tasks such as problem solving ( Linde & Bergstroem, 1992).
The significance level of a statistical test is equal to the probability that the null hypothesis is true.
as an occupational health epidemiologist you are required to measure the effect of stress on the workers in your
an instant lottery scratch off game offers a 0.04 probability of winning on any one play. plays are independent of
The supplier agrees they will deliver on the day the order is placed. Note that the basic unit of measurement for a period is one year in this case.
Find the critical value to test the claim that all ages have crash rates proportional to their driving rates. That all ages have crash rates proportional to their driving rates.
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