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Question: A matched sample case/control study was performed using cases and controls who have been matched on age and eye color and who all worked for the same chemical company. The cases had been diagnosed with melanoma. The exposure factor being studied was exposure to a chemical. The number of pairs is 80.
a) Compute chi-square for this matched sample case.
b) Compute the odds ratio and its 95% confidence limit. Write in words what this odds ratio means and what this confidence limit implies.
a researcher wanted to determine if the average waiting time at the emergency room in a local hospital is greater than
1. An observational study is conducted to investigate the association between age and total serum cholesterol. The correlation is estimated at r = 0.35. The study involves n=125 participants and the mean (std dev) age is 44.3 (10.0) years w..
Use the Chi-square test of independence with a .01 level of significance to determine whether appeal is independent from type.
Determine whether the evidence is enough to reject the salesperson's claim. Establish the Null and alternative hypothesis, and choose the right test statistics.
Suppose that for a random sample of rats, measures of aggression are found to be 5,12,23,24,18,9,18,11,36,1- Compute a .95 confidence interval for the mean assuming the scores are from a normal distribution.
You plan to conduct a marketing experiment in which students are to taste one of two different brands of soft drink.
This method measures the volume of a standard solution, which is then used to quantify the concentration of an analyte. In mini project 3, you have learned that titration is a common technique used to quantify the concentration of an analyte using..
The study measures owners' satisfaction with the design, content, layout, and performance of their new vehicles. A file entitled APEAL2 contains the satisfaction ratings for 2008 for each make of car.
At what point should a new order be placed if the candy store wishes to keep 95% level of service, assume normal demand and the lead time. How much safety stock should be ordered?
Find out best decision, by using following decision criteria.
1 you did a two-tailed t test for means equality and in step 2 you got a t value of 2.333. assuming 22 degrees of
A chemical plant has an emergency alarm system. When an emergency situation exists, the alarm sounds with probability 0.95.
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