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Cancer of the colon and rectum is less common in the Mediterranian region than in other western countries. The Mediterrainian diet contains little animal fat and lots of olive oil. Italian researchers compared 1953 patients with colon or rectal cancer with a control gropup of 4154 patients admitted to the same hospitals for unrealted reasons. They estimared consumption of various foods from a details interview, then divided the patients into three groups according to their consumption of olive oil.
a) Is this an observational or experimental study. Justify answer.b) Write down an Null and alternate hypothesis for analysing this data set.c) Results:
Olive OilLow Medium High TotalColon cancer 398 397 430 1225Rectal cancer 250 241 237 728Controls 1368 1377 1409 4154
Give an example calculation of one of the 6 cells in the table of the expected frequency under the null hypothesis. Explain how the null hypothesis is the basis of this calculation.d) determine the value of the relevent test statistic and the corresponding p-value.e) what is the result of your analysis? write an appropriate conclusionf) what assumptions about the data have you made? Are these assumptions justified in this case?
Is there sufficient evidence for concluding that true average repair time exceeds 200 min? Carry out a test of hypotheses using a significance level of .05.
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He is equally likely to select any. Billy leaves last and takes the one remaining hat. Let x be the number of cowboys who end up with the correct hat.
Conduct the equivalent, nonparametric test of hypothese using the five-step process. Do the following teams average a salary of 70 million dollars a year or less?
f x has a normal distribution with mean µ=15 and standard deviation σ= 3, describe the distribution of x values for sample size n, where n = 4, n = 16, and n = 100. How do the x distributions compare for the various sample sizes?
Assume that a 95% confidence interval estimate of the population mean annual starting salary is required. What is the planning value for the population standard deviation?
Is there enough evidence to believe that the average credit card debt has increased? Use a=0.05. Give a possible reason as to why or why not the debt was increased.
Describe what type of control chart you can use and how do you calculate the control limits (provide formula) to check if the calculate the control limits in this organization is in control.
Please share 3 real world examples of problems, which occurred due to the use of secondary data. Be specific about the consequences as well the secondary data used. You may use your own organization or research the net or literature for this one.
Given that the student selected is a social science major, what is the probability that she is also a sophomore? Write your responses as fractions.
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