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Part 1
In order to set rates, an insurance company is trying to estimate the number of sick days that full time welders in an oilfield welding company take per year. A previous study indicated that the standard deviation was 8.2 days. How large a sample must be selected if the company wants to be 90% confident that the true mean differs from the sample mean by no more than 2 days?
Part 2
A random sample of 16 healthy adults over the age of 45 showed a mean systolic blood pressure of 129 mm Hg and a standard deviation of 11 mm Hg. Construct a 98% confidence interval for the population mean of systolic blood pressure. Assume that systolic blood pressure is approximately normally distributed.
If we simply discard this one outlier and compare groups using Student's T or Welch's method, what criticism might be made even if we could ignore problems with non-normality?
There is some concern that exposure to gases used in anesthesiology might be harming health of anesthesiologists. In one study of 525 Michigan nurse anesthesiologists, 10 reported a new malignancy other than skin cancer during the previous year.
control chart for x bar is maintained on a quality characteristic which is normally distributed.the sample size is n4.
Monte Carlo sampling makes the assumption that all parameters of an alternative are: A. Independent B. Dependent C. Equal to 1.0 D. Probability distribution
question consider an investment portfolio of 50000 in stock a and 50000 in stock b. the expected value of a is 9.5
The Census Bureau says that the 10 most common names in the United States are (in order) Smith, Johnson, Williams, Jones, Brown, Davis, Miller, Wilson, Moore, and Taylor.
for liquid metals with a prandtl number much less than unity the velocity profile inside the thermal boundary layer on
an independent-measures research study uses two samples each with n 12 participants. if the data produce a t statistic
A study of 200 commercial firms revealed the data below. What is the probability that a particular firm will have 1 million or more in income after taxes?
Comparing batting averages Three landmarks of baseball achievement are Ty Cobb's batting average of 0.420 in 1911, Ted Williams's 0.406 in 1941.
Summarize the findings (r and P values most importantly). Do your hypothesis testing. Ho vs. Ha for each - Does the 40 yard dash time prediction make sense
In a certain town, 30% of adults have a college degree. The accompanying table describes the probability distribution for the number of adults (among 4 randomly selected adults) who have a college degree. Find the standard deviation for the probab..
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