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Public health officials believe that 90% of children have been vaccinated against measles. A random survey of medical records at many schools across the country found that, among more than 13,000 children, only 89.4% had been vaccinated. A statistician would reject the 90% hypothesis with a P-value of p = 0.01.
a) Explain what the P-value means in this context.
b) The result is statistically significant, but is it important? Comment.
The Bunte Auto Repair Shop received a shipment of four carburetors. One is known to be defective. If two are selected at random and tested.
a manufacturer of light bulbs advertises that on average its long-life bulb will last more than 5000 hours. to test the
an airplane holds 20 passengers. the probability a passenger will not show up is .1a. if the airline sells 25 tickets
find the following percentiles for the standard normal distribution. interpolate where appropriate. round your answers
(Duality Gap of the Knapsack Problem) Given objects i = 1,...,n with positive weights wi and values vi, we want to assemble a subset of the objects so that the sum of the weights of the subset does not exceed a given T > 0, and the sum of the valu..
An employer interviews 10 people for 6 customer service positions in a company, and 5 of the 10 people are men. If all 10 are qualified, in how many ways can the employer fill the customer service position if exactly 2 are men?
a mean guy gave you a nice sample from normal distribution with known variance. so the test should be easy. but he
Develop a 1,050-word report in which you: Identify the types of descriptive statistics that might be best for summarizing the data, if you were to collect a sample. Analyze the types of inferential statistics that might be best for analyzing the data..
Engineers hoped to base their decision on re- actions of 50 drivers, but time and budget constraints may force them to cut back to 20. How would this influence the power of the test? Describe.
mcdonalds waiting times. you want to estimate sd for the population of waiting times at mcdonalds drive up windows. you
The distribution of scores on this assignment had a mean of 9.2 points and a standard deviation of 2.1 points. Would it be appropriate to use a normal distribution to calculate the proportion of students who scored below 7 points on this assignmen..
a. Assuming the advertising claim is true, what is the probability of the observed event?- Assuming the claim is true, what is the probability of observing two or fewer successes?
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