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A clinical trial is conducted comparing a new pain reliever for arthritis to a placebo. Participants are randomly assigned to receive the new treatment or a placebo. The outcome is pain relief within 30 minutes. The data are shown in table:
Pain relief no Pain relief New medication 44 76Placebo 21 99
a. Generate a 95% confidence interval for the proportion of patients on the new medication who report pain relief.
b. Generate a 95 % confidence interval for the difference in proportions of patients who report pain relief.
At 0.05 level of significance, is there enough evidence to conclude that difference exists between proportion of students who have ear infections at one school and the other?
where the deviations εi are assumed to be independent and Normally distributed with mean 0 and standard deviation σ. This model was fit to the data using the method of least squares. The following results were obtained from statistical software.
For a sample of students in the college of business administration at mid-atlantic university, the mean grade point average is 3.10 with a standard deviation of 0.25.
Western residents reported that they were completely satisfied with their local telephone service. Find the 95% confidence interval for the difference in two proportions.
Confidence interval for the population mean - Prepare a 99% confidence interval for the population mean.
The standard deviation of grade points was 0.65 and the mean was 2.89. The standard error for the sample was
In a market study for Target, a researcher found that 70% of customers are repeat customers. If 14 customers are selected at random, find the probability of getting.
Make a graph to visualize the problem and state, without doing the calculations, whether the p-value of the test
Finding the probability of each event in a group of events of different possibility
You create a 95% confidence interval for your average score and it is (76.347, 79.133). Given this information, what is the best conclusion?
A local group claims that the police issue more than 60 speeding tickets a day in their area.
Based on the model N(1152,84) describing Angus steer weights, what are the cutoff values for.
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