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A clinical trial is run comparing a new drug for high cholesterol to a placebo. A total of 40 participants are randomized (with equal assignment to treatments) to receive either the new drug or placebo. Their total serum cholesterol levels are measured after eight weeks on the assigned treatment. Participants receiving the new drug reported a mean total serum cholesterol level of 209.5 (std dev = 21.6) and participants receiving the placebo reported a mean total serum cholesterol level of 228.1 (std dev = 19.7).
1. Construct a 95% confidence interval for the difference in mean total serum cholesterol levels between participants receiving the new drug versus placebo.
2. Is the new drug effective? Justify briefly.
To conclude the effect of a new fertilizer on productivity of tomato plants one group of plants is treated with the new fertilizer as a second group is grown without such treatment. The number of ripe tomatoes produced by each group is counted.
peter the head of a survey organization is planning to do a survey to estimate the percentage of people who intend to
The effectiveness of short term relaxation and cognitive-behavioral
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The mean output power is 42 watts, with a standard deviation of 8 watts Assuming a confidence level of 95%, which of the following statements do these data support?
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in order to monitor the ecological health of the florida everglades various measurements are recorded at different
What about a variable I intend to use to help do some forecasting. Interest rates, for example, will have an effect on the number of houses purchased --- may I call interest rate the independent variable and number of houses purchased the dependent v..
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