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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.
As the price of oil rises, there is increased worldwide interest in alternate sources of energy. A Financial Times/Harris Poll surveyed people in six countries to assess attitudes toward a variety of alternate forms of energy
Proportions of defective chips are 4.0% and 6.0% respectively. Using a confidence level of 95%. Which statement is supported by data?
A test was conducted to find out whether gender of a spokesperson affected the likelihood that consumers would prefer a new product. A survey of consumers at trade show employing a female spokesperson determined that 70 out of 150 customers prefe..
The alternative hypothesis is true. In this case the consumer advocacy group will have, A consumer advocacy group doubts this claim and tests the hypotheses
What is the probability that the sample proportion will be within +/- .03 of the population proportion if a sample of size 1,200 is selected?
A random sample of 20 single men was asked if they would welcome a woman taking the initiative in asking for a date. What is the probability that none of the men will say yes?
Prediction interval for the regression line - Using the age and sick days data from table below, find the 98% prediction interval when x = 47 years.
Construct a 95% confidence interval for the population mean.
Explain why the t distribution is used as a part of the confidence interval.
Estimating the combined mean values for the given data - find the mean for the combined sample
Construct a decision table for this problem. Include all conditional values and probabilities in the table.
Discuss the concept of statistical significance, including your understanding of what it means, why it is important, and how it can be used.
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