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1. Several years ago some colleagues and I did an experiment to see if Avon's Skin-so-Soft was as good as OFF in repelling mosquitoes. We recruited 10 students and randomly assigned one arm to Skin-so-Soft and one to OFF. They wandered the campus for four hours, and we counted the number of new mosquito bites on each arm.
The value of the Wilcoxon signed rank statistic isA. W+ = 13.B. W+ = 28.C. W+ = 32.
2. An experiment is set up to compare the effects of two different treatments on the age at which a child first walks. Eleven children were randomly divided into two groups, five in group 1 and six in group 2. Children in the first group were given special walking exercises for 12 minutes per day beginning at 1 week and lasting 7 weeks. The second group of children received daily exercises but not the walking exercises administered to the first group. Progress was checked weekly and the ages in months when the children first walked are given below.
The Wilcoxon rank sum of the ranks for group 1 is
A. 18.5.B. 15.5.C. 15.0.
3. Some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and soil treatment. An experiment was conducted to compare peach tree seedling growth with soil and weeds treated with one of two herbicides.In a field containing 10 seedlings, six were randomly selected throughout the field and assigned to receive Herbicide A. The remaining seedlings were to receive Herbicide B. Soil and weeds for each seedling were treated with the appropriate herbicide, and at the end of the study period the height (in cm) was recorded for each seedling. The following results were obtained:
When ranking all the observations together, the observations at a height of 81 cm should each be assigned the rank
A. 7.5.B. 8.0.C. 8.5.
For the mold described in (g), can you find the probability that it's COST value will exceed $150,000? If yes, obtain this probability. If no, why not?
Find the probability that of 800 randomly selected incoming first-year students, at least 260 have elected to enroll in the course.
MATH1550H: Assignment: Questions: Let’s assume the department of Mathematics of Trent University has 11 faculty members. For i = 0; 1; 2; 3; find pi, the probability that i of them were born on Canada Day using the binomial distributions.
How do you find the z-score corresponding to a score of X = 100 for the distributions given below? How do you know what direction they are going?
Write the null and alternative hypotheses for testing if participants and non-participants differ in level of problem behavior (Y).
Analysis of weekly widget production reveals that the number of widgets X produced in a week is a random variable with mean μX = 200 and standard deviation σX = 20. What are the mean and the standard deviation of C?
An independent financial advisor claims an average rate of return, μ, on a particular investment is at least 7%. In testing her claim, the correct pair of hypotheses is:
You own a small tea company, Sweet Leaf, NASDQ ticker symbol LEAF. You are looking at marketing costs versus benefits. Your production manager says it doesn't matter which tea you produce
A health care analyst would like to know that if the duration of a given eye surgical procedure has a normal distribution with a mean of 240 minutes and a standard deviation of 40 minutes
Explain how a matched pairs experiment should be conducted to compare texting and typing speeds. Be sure to explain the role of randomization, and why it is important in this experiment and how should randomization be used in this experiment
Suppose that a survey is being planned for purposes of estimating the average number of hours spent exercising daily by adults (18 years of age or older) living in a certain community.
Use analysis of variance to test any differences in mean glue strengths.
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