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To determine whether or not they have a certain desease, 154 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 11. The blood samples of the 11 people in each group will be pooled and analyzed together. If the test is negative, one test will suffice for the 11 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 11 people will also be individually tested and, in all, 12 tests will be made on this group. Assume the probability that a person has the desease is 0.09 for all people, independently of each other, and compute the expected number of tests necessary for the entire group of 154 people.
In certain normal distribution of scores, mean is 50 and standard deviation is 4. Determine z-score corresponding to a score of 55.
What sample size would be needed to estimate the true proportion of students at your college
Find the confidence interval for the mean price, μ, of all dealer sticker prices of new cars: for a confidence level of 90% in thousands of dollars:
A researcher is interested in determining the proportion of public elementary schools that have a mandatory school uniform policy. The researcher randomly sampled n=400 public elementary schools and found that 100 of the schools have a mandatory s..
What are planned comparisons? Why do researchers making planned comparisons need to make the Bonferroni correction? If a researcher is making four planned comparisons using the .05 significance level
Assume that the mean useful life of a particular lightbulb is 2,000 hours and is normally distributed with a standard deviation of 300 hours. Determine the percentage of lightbulbs that will last 2,300 hours or longer.
Stalnaker technique: what effect does the independent variable have on the dependent variable? type of hypothesis? what is independent variable? dependent variable?
The stakeholders in the simulation have different opinions as to the proper course of action the organization should take. Explain the decisions you made in the third cycle of the simulation.
After calculating the sample size needed to estimate a population proportion to within 0.04, your statistics professor told you the maximum allowable error must be reduced to just .01. If the original calculation led to a sample size of 800, the s..
He is twice as likely to visit city X than the other city. Obtain the transition probability matrix. Also determine the proportionate visits by him to each of the cities in the long run.
A random sample of 25 statistics examinations was taken. The average score in the sample was 76 with a variance of 144. Assuming the scores are normally distributed, the 99% confidence interval for the population average examination score is:
Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more? Why or why not?
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