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There are four entrances to the Government Center Building in downtown Philadelphia.
The building maintenance supervisor would like to know if the entrances are equally utilized.
To investigate, 400 people were observed entering the building. The number using
each entrance is reported below. At the .01 significance level, is there a difference in the
use of the four entrances?
Entrance Frequency
Main Street 140
Broad Street 120
Cherry Street 90
Walnut Street 50
Total 400
The time, in hours, that a copying machine may work without breaking down is the normally distributed random variable with mean 549 and the standard deviation 68.
Determine new, standardized score for each of following values from original population.
What is the standard deviation of the number of requests in a 10 hour work day? Give your answer to four decimal places.
Of the 250 students in a blind taste test, 150 (60%) preferred Milwaukee's Best over Natural Light. Then the 90% confidence interval for the student population proportion preferring Milwaukee's Best is:
Conduct a hypothesis test using H 0 : σ 2 = .009216 to see whether the sample data indicate that the variability in interest rates changed.
In-Home stability ratings of children and teenagers age 4 to 14 years who have been diagnosed with ADHD and who are being treated with neurotherapy differs from in-home stability ratings of children and teenagers age 4 to 14 years who have been di..
A rare disease has just broken out. Doctor Johnson is trying to help, but while treating patients he might expose himself to the disease.
The standard deviation of test scores on a certain achievement test is 10.5. A random sample of 150 scores on this test had a mean of 72.8.
Find the mean, median, and mode for the following sample of scores: 2,3,3,1,2,5,2,3,4,2
Using the menu systems, request descriptive statistics (mean, s.d. and variance) for both your original variables
Calculate a 92% confidence interval for the mean density of quartz porphyry, given that 75 samples yield mean of 2.62 grams per cubic centimeter
Choose the correct conclusion regarding the claim that the weights of statistics text vary more than the weights of text in general.
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