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Medicine and Clinical Studies
A new prescription medication is designed to ease the pain of arthritis. In a clinical trial, both treatment and placebo groups were studied to determine whether there were any adverse reactions. The table below lists the number of patients in each group who experienced each adverse reaction. Assume each group represents a random sample.
a. Find a 95% confidence interval for the true proportion of people who suffered a headache in each of the groups.
b. Is there any evidence to suggest the true proportion of people who suffered a headache is different for the two groups? Justify your answer.
c. Find a 98% confidence interval for the true proportion of people who experienced a rash in each of the groups.
d. Is there any evidence to suggest the true proportion of people who experienced a rash is different for the two groups? Justify your answer.
Consider the following frequency table of the performance ratings on a scale of 1-good, 2-fair, and 3-poor, bestowed on their local baseball team by a collection of 100 fans:
If we fit the least-squares line to the 12 data points (one for each month) we obtain the following results from a software package. Notice that temperature is taken as the explanatory variable and crawling age as the response.
find the area under the normal curve to the left of z -1.57 plus the area under the normal curve to the right of z 2.57
An automobile manufacturer has a new model that they claim gets 27 miles per gallon. A consumer testing agency chooses 50 of these cars and finds that the sample mean is 25 miles per gallon and the sample standard deviation (s) is 3 miles per gall..
In relation to this problem how would you try to develop a frequency distribution with five classes for these data? In relation to this problem how would you, Try to Develop a histogram based on the frequency distribution.
The correlation between his test and the BDI was r =.14. Evaluate this correlation. What does this correlation tell us about the relationship between these two instruments?
Farmers know that driving heavy equipment on wet soil compresses the soil and injures future crops. Here are data on the "penetrability" of the same type of soil at 2 levels of compression.
why would we use a matched-pairs design and what is an example where this would
At a large assembly line, the manufacturer reassigns employees to different tasks each month. This keeps the workers from getting bored by endlessly repeating the same task. It also lets them see how the work done in different stages must fit toge..
What point is Paine making when he argues, "Europe, and not England, is the parent country of America"? How does he use the national origins of English monarchs to show that the colonists' English origins are irrelevant to the decision they now fa..
In this unit you are thinking about bivariate distributions. One important feature of these distributions is covariance which ultimately establishes whether the two variables tend to "move together positively," "move inversely," or have no relati..
a batch of 25 injection-molded parts contains five that have suffered excessive shrinkage. if two parts are selected at
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