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To determine whether or not they have a certain desease, 90 people are to have their blood tested. However, rather than testing each individual separately, it has been decided first to group the people in groups of 10. The blood samples of the 10 people in each group will be pooled and analized together. If the test is negative. one test will suffice for the 10 people (we are assuming that the pooled test will be positive if and only if at least one person in the pool has the desease); whereas, if the test is positive each of the 10 people will also be individually tested and, in all, 11 tests will be made on this group. Assume the probability that a person has the desease is 0.03 for all people, independently of each other. Compute the total expected number of tests necessary.
The trial failed to show significance. How many subjects would be required to detect the difference in proportions observed in the trial with 80% power?
Find that the mean weight in the sample is 308 pounds.The standard deviation is 23. Using significance level of .01 test the null hypothesis using 5-step procedure.
Write a hypothesis that you might test to compare two or more samples in your example. Indicate which hypothesis test you would use and the samples you would select.
The MIT team will receive 2 points for a win, 1 for a tie. and 0 for a loss. Find the PMF of the number of points that the team earns over the weekend.
A sample of 46 bars is taken and their mean length is determined to be 51 centimeters with a standard deviation of 3.6 centimeters. Using a .01 significance level, test the retailers claim that the population mean is less than 50 centimeters.
What type of probability distribution will most likely be used to analyze the number of chocolate chip parts per cookie in the following problem?
A study of cats and dogs found that 11 of 50 cats and 21 of 50 dogs slept more than 10 hours per day. At the .05 level of significance, is there sufficient evidence to conclude that a difference exists between the proportion of cats and the propor..
High School GPA is normally distributed with a mean of 3.06 and a standard deviation of 0.40. The probability of a randomly chosen student having a HS GPA between 3.54 and 3.80 is
Find the 95% confidence interval for the true population mean. Identify the point estimate for mean and margin of error.
Our bodies have a natural electrical field that is known to help wounds heal. Does changing the field strength slow healing? A series of experiments with newts investigated this question.
If the weekly salaries are normally distributed, estimate the fraction of employees that make more than $300 per week.
What is the probability that the mean weight for a sample of 40 trout exceeds 405.5 grams?
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