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"A researcher designs an experiment to study the growth of pine trees at an early stage of their development. Towards this objective, a nursery worker records 39 measurements of the heights of 1-year-old pine seedlings. This set of height measurements are recorded in centimeters. Answer the following questions using the Histogram Applet.
Is 1.7cm a Plausible mean value? Explain.
Plot the data, fit a trend line, and discuss the strength of prediction of the regression model.
If 20 measurements are taken and their standard deviation is 1.8, is there enough evidence to reject the claim that her standard deviation is within the limit at ∞ = .01?
Find the equation of least -squares line and plot the line on the scatter diagram of part (a)
What can you say about the effect of sample size on confidence intervals?
Using the first two digits of the measurement as your stem, construct a stem and leaf display of the data above.
A sample has just been taken with the following lengths: 21.25, 22.0, 21.5, 20.75, 21.25, 21.35, 21.35, 21.35, 21.35, 21.35, 21.35, and 21.35. Is the new seamstress performing at an acceptable quality level?
Does there seem to be any difference in the effect of the antibiotics on clearance of otitis media? Express your results in terms of relative risk (RR). Consider separate analyses for unilateral and bilateral cases. Also consider an analysis combi..
Share with your peers the null and alternative hypotheses for a decision that is relevant to your life. This can be a personal item or something at work.
Please address the following question: When is the mean the best measure of central tendency? When is the median the best measure of central tendency?
To compute all the descriptive statistics for the following set of three test scores over the course of a semester. Which test had the highest average score? Which test had the smallest amount of variability?
Does your analysis change if the term "average" refers to the mean? To the median? Explain what effect this misinformation might have on the perception of the nation's schools.
What is the probability that the project will be completed in 17 months or less?
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