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In a study of the effectiveness of a fabric device that acts like a support stocking for a weak or damaged heart, 110 people who consented to treatment were assigned at random to either a standard treatment consisting of drugs or the experimental treatment that consisted of drugs plus surgery to install the stocking. After two years, 30% of the 60 patients receiving the stocking had improved and 20% of the patients receiving the standard treatment had improved. (Use a statistical computer package to calculate the P-value. Round your test statistic to two decimal places and your P-value to four decimal places.)
z =
P =
what are the conditions for using the standard deviation formula when conducting a significance test? be specific about
Find the implied volatility of the following European call. The call has four months until expiry and an exercise price of $100. The call is worth $6.51 and the underlying trades at $101.50. Assume the risk free interest rate is 8% per annum.
Find the probability that between 7 and 9 defective toys are produced in a lot. Find the probability that between 7 and 9 defective toys are produced.
a well insulated piston-cylinder device with a free floating piston contains 1 kg of a 25 quality saturated misture of
1. the average price of homes sold in the u.s. in the past year was 220000. a random sample of 81 homes sold this year
Does this sample show sufficient evidence that the private university loan default rate is below the rate for all universities, using a left-tailed = .01. That is, do you reject the null hypothesis?
1a. the mean weight of 120 7th graders is 75 lbs with a standard deviation of 6 lbs. calculate the standard error of
Estimate the population mean
Find the probability that an individual graduate will have a salary over $45,000. A group of nine graduates will have a group average over $45,000.
In 35 of their stores they sold on the average 430 suits per year with a population standard deviation of 40. What is the test value for their claim?
To obtain the probability that the mean wage of 75 randomly selected workers will exceed $43,000
How would you define Incidence Rate
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