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The following frequency table summarizes the distances in miles of 100 patients from a regional hospital.
Distance Frequency
0-2 30
2-4 35
4-6 20
6-8 10
8-10 5
Calculate the sample variance and standard deviation for this data (since it is a case of grouped data- use group or class midpoints in the formula in place of X values, and first calculate the sample mean).
In a random sample of 200 automobile insurance claims obtained from all state insurance Company, mean=$615 and s= $135. Calculate the following intervals:
What is the probability that Company B would charge more than Company A to drill a well - The depths of wells drilled in this area have a normal distribution with a mean of 250 feet and a standard deviation of 40 feet.
A random variable is normally distributed with a mean of 25 and a standard deviation of 5. If an observation is randomly selected from the distribution.
the lifetime of a disposable water filter is normally distributed with mean m 30 gallons and standard deviation s 6
a regional track championship has decided that they will invite the fastest 15 of runners in their region runners with
Testing for equality of variances - Independent random samples were taken from normal distributions of the yearly production of ships built by the International Ship Building Company under
A school is studying their students' test scores by grade. Explain how the characteristic "grade" could be considered either a categorical or a numerical variable.
suppose the mean systolic blood pressure in a group of individuals is 150 mmhg with a standard deviation of 15.
A corporation that owns apartment complexes wishes to estimate the average length of time residents remain in the same apartment before moving out.
the management of red cat computers was considering launching a new product called the tiger 100. the problem was that
1. Allen Machines specializes in developing weed-harvesting equipment that is used to clear small lakes of weeds. Allen Machines is contemplating the construction of a machine that would harvest weeds on narrow rivers and waterways. The activ..
Calculate the return on equity (ROE) for a sample of 20 banks for the year before the Sarbanes-Oxley Act was enacted. For the same sample of banks, calculate the ROE for the year following the enactment of the Sarbanes-Oxley Act
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