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Increased research and discussion have focused on the number of illnesses involving the organism Escherichia coli (01257: H&), which causes a breakdown of red blood cells and intestinal hemorrhages in its victims.
According to the Center for Disease Control, an estimated 73,000 cases of E. coli infection and 61 deaths occur in the United States each year. A 2006 outbreak traced to wild pigs, which spread the bacteria into a spinach field in California, sickened 204 people in 26 states and 1 Canadian province. 6 bacteria Outbreaks have occurred at a rate of 2.5 per 100,000. Let us suppose that this rate has not changed.
a. What is the probability that at most five cases of E. coli per 100,000 are reported in California this year?
b. What is the probability that more than five cases of E. coli are reported in California this year?
c. Approximately 95% of occurrences of E. coli involve at most how many cases?
A better case can be made that observation 13 (Los Arboles) is an outlier. Describe what this means in plain terms.
Elucidate the null and alternative hypothesis for the difference among the two means. In testing the difference between the means of two.
Compute the incidence proportion or the risk ratio that compares group 1 to group 0, and compute the Incidence proportion or the risk ratio which compares group 2 to group 0. Then post a summary of your findings.
A physician wanted to estimate the mean length of time µ that a patient had to wait to see him after arriving at the office.
Do any of the selected samples seem to be out of the control limits? Describe.
Utilize a test of the difference among proportions when answering these questions. Illustrate the research hypothesis.
Determine the point estimate? Give the symbol and value.
Determine the probability that we would reject null hypothesis given that it is true?
How do we decide if the homogeneity of variance assumption is significantly violated?
What conclusions can you draw about the nature of the relationship between anxiety and exam performance?
When would you use hypothesis testing and when would you use confidence intervals?
By using.02 level of significance, carry out a 5-step hypothesis testing procedure to find out if new processes considerably reduced the wait time.
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