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A study ia conducted to compare an experimental treatment with a control treatment i reducing join pain in patients with arthritis. 200 patients are randomly assigned to the treatment group or contral. of the 100 patients assigned to the treatment group, 54 reported improvement in thier symtopms. ofthe 100 patients assigned to the control group, 42 reported imporvement in their symptoms. test the claim that the proportion of the people reporting imporvement was higher amoung the experimental treatment group than the control treatment. use z= 1.96.
A standard IQ test has mean of 98 and a standard deviation of 16. We want to be 99% certain that we are 8 IQ points of the true mean. Determine the sample size.
Choose an American driver at random and let the random variable X be the number of speeding tickets the driver has received in the last two years. The discrete probability distribution of X is shown.
Seventy-five percent of households say they woud feel secure if they had $50,000 in savings. You randomly select 8 households and ask them if they would feel secure if they had $50,000 in savings.
Create the box plot to represent data. Explain the distribution. Ensure to recognize the first and third quartiles and median.
Use the binomial distribution formula to calculate the probability that a) out of 5 adults, none is concerned that employers are monitoring phone calls.
Using the 0.05 level of significance, is there evidence that the population mean is above $190? What is your answer in (a) if s = $50 and the 0.10 level of significance is used?
You are estimating the cost ($K) of optical sensors based on the power output of the sensor. Using the preliminary calculations from a data set of 8 sensors, determine the equation of the line. (Round your intermediate calculations to 3 decimal pl..
The table below lists deaths in Georgia in 2004, the estimated population of Georgia in 1994 and the U.S. population according to the 2000 census. Calculations should be done by hand, but feel free to use software to check your work.
Compute a 95% confidence interval for the population proportion of positive drug tests. Explain why is the normality assumption not a problem despite the very small value of p.
The makers of a soft drink want to identify the average age of its consumers. A sample of 16 consumers is taken. The average age in the sample was 22.5 years with a standard deviation of 5 years.
The only difference is that the first group is comprised of athletic persons and the second of non-athletic ones.
The average speed of greyhound dogs is about 18.8 meters per second. A particular greyhound breeder claims that her dogs are faster than the average greyhound. In a sample of 45 dogs, they ran, on average, 19.2 meters per second with a standard de..
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