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Before this outbreak, the proportion of children vaccinated against measles on the Arkansas side was substantially higher than the proportion vaccinated on the Texas side. The Texas side had never had a community or school vaccination campaign for measles. In contrast, the Arkansas side had held mass community programs against measles for school and pre-school children in 1968 and 1969.
Based on health department and physician records, investigators estimated that over 99% of children aged 1-9 years in Miller County, Arkansas had received measles vaccine prior to the outbreak. The overall vaccination level in Bowie County, Texas, was estimated to be 57%.
In this outbreak, 27 of the measles cases in Bowie County and all 25 of the measles cases in Miller County gave a history of prior vaccination with live attenuated measles-virus vaccine. Parental history of vaccination was corroborated for all the cases by clinic or physician records. Local health authorities in both counties were very concerned that children who had previously received measles vaccine got the disease.
Calculate attack rates among the vaccinated populations in both counties and comment on your findings.
tthe federal trade commission ftc conducted a study in 1998 of checkout scanners. the ftc inspected 1669 scanners at
(a) Describe how randomization will be used in the design and why. Answer should be at least 3-4 complete sentences.
Question: Based on the above five steps, how would you ensure that your Hypothesis testing yields credible results?
How does the effect size affects the power of a test? Provide an example along with your explanation.
Give detail on why it might the positive or negative and how the data is represented.
He works out of the garage at his home. Since his business is booming, he uses the whole garage to make and sell merry-go-rounds.
the mean per capita income is 17635 dollars per annum with a standard deviation of 891. what is the probability that
An auditor is checking invoices that have been paid to see if they contain any errors. Historically around 7 per cent of all invoices are expected to contain.
The quality control process at a manufacturing plant requires that each lot of finished units be sampled for defective items. Twenty units from each lot are inspected.
Read News Story 12 in the Appendix, "Working nights may increase breast cancer risk." The story describes two separate observational studies.
If at the beginning of the week to toasters are in stock, the profit Y from sale of toasters during the week is Y = 2 minimum (X, 10).
Consider the expense ratio and the total one year rate of return n the W&R family of mutual funds in table below:
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