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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.
A bank wants to get new customers for their credit card. They try two different approaches in their marketing campaign. The first promises a "cash back" reward; the second promises low interest rates. A sample of 500 people are mailed the first br..
Below is a plot of the Olympic gold medal winning performance in the high jump (in inches) for the years 1900 to 1996.
A radio station wants to know if residents in their area are in favor of a proposed tax increase. They invite listeners to call in to respond to the poll. 645 of the 800 who responded were against the tax.
MATH1550H: Assignment: Question: what is the least number of applicants that should be interviewed so as to have at least 50% chance of finding one such secretary?
The margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is
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.
Answer all of these questions using R Commander. Include all graphs, outputs from R Commander.
Calculate descriptive statistics for each stock and the S&P 500. Comment on your results. Which stocks are the most volatile? Calculate the value of beta for each stock.
How strong is the evidence against the company's claim? Based on these data, the P -value of the appropriate test
Below is a normal plot of residuals from a regression. Does the plot indicate any problems with the assumption that the residuals are Normally distributed
Drug sniffing dogs must be 95% accurate. A new dog is being tested and is right in 46 of 50 trials. Find a 95% confidence interval for the proportion of times the dog will be correct.
how many individuals will I need to sample if I want a 95% margin of error to be no more than 3%, I want to know if the results are significant at = 10%. With the information given.
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