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A clinical trial is being planned to investigate the effect of a new experimental 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 points in mean total cholesterol levels between groups. They assume that 10% of the participants randomized will be lost over the 2 month follow-up. How many participants must be enrolled in the study? Assume that the standard deviation of total cholesterol is 18.5.
As the correlation coefficient increases from 0.85 to 0.88, do the points of the scatter plot move toward the regression line, or away from it?
Nine percent of undergraduate students carry credit card balances greater than $7,000. Suppose 10 undergraduate students are selected randomly to be interviewed about credit card usage.
in 1990 the mean ph. level of rain in town was 4.61. a biologist fears the ph. level has recently increased. she draws
At 90% confidence, what is the margin of error (to 4 decimals)? Use critical value with three decimal places Develop a 90% confidence interval for the population proportion of adults who think the future health of Social Security is a major economi..
The sample size n , the sample means, and the sample standard deviations for the two groups are given below.
The calculated value of F in a one-way analysis is 8.23. The numerator degrees of freedom and denominator degrees of freedom are 4 and 8, respectively.
Why might driver be tempted not to use seat belt "just on this trip"?
suppose we draw two tickets from a hat that contains tickets numbered 1234. let x be the 1st number drawn and y be the
1. suppose that a very sneaky little mouse squeaks on average only one time in 50 when he sees a piece of cheese on a
Survey on What do you think is the biggest problem facing education today. One problem with exit polls may be that the wrong "key precincts" were chosen.
A research study will measure the cost of the new method over a sample production period. Develop the null and alternative hypothesis most appropriate for this study.
Solve each system of equations using matrices(row operations). Have to see step by step of what is going on.
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