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A clinical trial is being planned to investigate the effect of a new experiment drug designed to reduce total serum cholesterol. Investigators will enroll participants with total cholesterol levels between 200-240, they will be randomized to receive the new drug or a placebo and followed for 2 months, and the total cholesterol will be measured. Investigators plan to run a test of hypothesis and want 80% power to detect a difference of 10 patients in Mean total cholesterol levels between groups. How many participants must be enrolled in the study? Assume that the standard deviation of total cholesterol is 18.5.
Don't quite understand the concept of computing confidence intervals. How would confidence intervals determine sampling design and data collection for information gathered.
Describe in some detail how a hypothesis test could be used in some real world context such as business, politics, church, Girl Scouts, school, or perhaps your place of work.
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national exercise rate is 20%. The researcher gathers a random sample of 120 individuals who live in California and find..
The stakeholders in the simulation have different opinions as to the proper course of action the organization should take. Explain the decisions you made in the third cycle of the simulation.
The following data (in pounds), which were selected randomly from a normally distrubuted population of values, represent mearsurements of a machine part that is supposed to weigh, on average, 8.3 pounds.
Change the last number in that set from 36 to 14 and recalculate the confidence interval. Using the results, describe the effect of an outlier or extreme value on the confidence interval.
A population that starts at 100 and doubles in growth every eight years: The expression would give the population t years after the growth starts.
A fastener manufacturing company uses a chi-square goodness of fit test to determine if a population of all lengths of ¼ inch bolts it manufactures is distributed according to a normal distribution.
According to the U.S. Census Bureau, the mean household income in the United States in 2000 was $63,091 and the median household income was $50,054.
Please explain by using the traditional methods for testing hypotheses and showing the results of all steps in the process.
In a sample of 1200 police officers, the mean annual salary was $33,000 and the standard deviation was $3200. A random sample of size 70 is drawn from this population. What is the probability that the mean annual salary is between $32,000 and $32,..
If we believe the manufacturer's assertion, what is the probability that at most 3 of the 6 seeds that were planted will germinate?
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