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1.A study is designed to investigate whether there is a difference in response to various treatments in patients with rheumatoid arthritis. The outcome is patient's self-reported effect of treatment. The data are shown below. Is there a significant difference in effect of treatment? Run the test at a 5% level of significance.SymptomsWorsenedNo EffectSymptoms ImprovedTotalTreatment 122141450Treatment 214152150Critical value:Computed statistic:Based on comparing the computed statistics to the critical value which of the following is (are) true?A. There is significant evidence, alpha =0.05, to show that there is a difference in the proportions of patients who show improvement between treatments 1 and 2B. There is not a significance evidence, alpha=0.05, to show that there is a difference in the proportions of patients who show improvement between treatments 1 and 2C. There is significant evidence, alpha=0.05 to show there is no difference in the proportions of patients who show improvement between treatments 1 and 2D. A and c
A federal report find that a lie detector test given to truthful persons have a probability of 0.2 of suggesting that the person is deceptive. A company asks 12 job applicants to take a lie detect test. Suppose that all 12 applicants answer truthf..
One of the 100 test subjects is selected at random. Given that the person selected approves of the mayor, what is the probability that they vote democrat?
You conduct a hypothesis test and you observe values for the sample mean and sample standard deviation when n = 25 that do not lead to the rejection of H0. You calculate a p-value of 0.0667.
The linear correlation coefficient, r, measures the strength of the linear relationship the variables in a set of ordered pairs (x,y). What is the maximum and minimum values for r?
Provide a 95% confidence interval for the difference between the two population means. Compare the means of population 1 and population 2. Are they equal? Show your test procedure.
What kind of correlation do you expect to find between annual income and amount spent on car? Will it be positive or negative?
The Johnson family uses a propane tank for cooking on their gas grill. During the summer they need to replace their tank on average every 30 days.
Solve different inventory control problems using an appropriate OR method.
Write the linear regression equation to forecast father's education from mother's education?
Four brands of lightbulbs are being considered for use in the final assembly area of the Saturn plant in Spring Hill, Tennessee. The director of purchasing asked for samples of 100 from each manufacturer.
In order to estimate the proportion of families who prefer female baby-sitters to male baby-sitters with an error of at most 8 percentage points and with at least 95 percent confidence, how large a sample should be taken?
What if the size for each sample were increased to 20? Would a sample mean of 115 or more be considered unusual? Why or why not? Why is the Central Limit Theorem used?
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