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A clinical trial is planned to compare an experimental medication designed to lower blood pressure to a placebo. Before stating the trial, a pilot study is conducted involving seven participants. The objective of the study is to assess how systolic blood pressure changes over time untreated. Systolic bp are measured at baseline and again 4 weeks later. Is there a statistically significant difference in blood pressures over time? Run the test at a 5% level of significance.
Baseline: 120 145 130 160 152 143 126
4 weeks: 122 142 135 158 155 140 130
How could your answer in question (a) change if you knew returns followed a skewed distribution instead of a normal distribution? Explain briefly.
Explain why most forecasting error measures use either the absolute or the square of the error.
Identify all the averages (mean, median, or mode) that can be used to summarize the outstanding balance on each account.
How many annual employee expenses does he need to sample to obtain a 95 percent confidence interval no large than "plus or minus $500"?
question how would you explain the analysis of variance assuming that your audience has not had a statistics class
a. How many of the employees would you expect to have voted for President Bush? b. All of the employees indicated that they voted in the 2004 presidential election. Determine the probability of this assuming they followed the national trend. c. Ei..
The second kind of error is when the null is false and you fail to reject. Report the first kind of error and the second kind of error.
If 134 out of a random sample of 235 college students expressed an intent to vote, can we reject the aide's estimate at the 0.05 level of significance? Perform a one-tailed test.
A forest contains 30 moose of which six are captured, tagged, and released. A certain time later, five of the 30 moose are captured.
Discuss potential explanations for the increase in median ROIC and the widening of the distribution of ROICs across all companies over recent decades.
Assume further each question is independent, that every answer is equally likely to be selected, and that there is one correct answer.
A sales representative of a certain pain reliever claims that the effect would last for 6 hours. A survey from 15 randomly selected workers
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