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Question: In each of the following data problems there is some potential violation of one of the independence assumptions. State whether there is a cluster effect or serial correlation, and whether the questionable assumption is the independence within groups or the independence between groups.
(a) Researchers interested in learning the effects of speed limits on traffic accidents recorded the number of accidents per year for each of 10 consecutive years on roads in a state with speed limits of 90 km/h. They also recorded the number of accidents for the next 7 years on the same roads after the speed limit had been increased to 110 km/hr. The two groups of measurements are the number of accidents per year for those years under study. (Notice that there is also a potential confounding variable here!)
(b) Researchers collected intelligence test scores on twins, one of whom was raised by the natural parents and one of whom was raised by foster parents. The data set consists of test scores for the two groups, boys raised by their natural parents and boys raised by foster parents.
(c) Researchers interested in investigating the effect of indoor pollution on respiratory health randomly select houses in a particular city. Each house is monitored for nitrogen dioxide concentration and categorized as being either high or low on the nitrogen dioxide scale. Each member of the household is measured for respiratory health in terms of breathing capacity. The data set consists of these measures of respiratory health for all individuals from houses with low nitrogen dioxide levels and all individuals from houses with high level.
1. What is the estimated value of the regression coefficient for variable Weight? 2. What is the estimated value of the intercept? 3. What is your computed value of SSE?
Carry out a survey to estimate the mean or total of a population of your choice, in which an auxiliary variable is available along with the variable of interest.
Constructing histogram, Using a normal probability plot, Plotting residuals versus x values.
suppose that you are in a class of 33 students and it is assumed that approximately 15 of the population is
suppose diameters of trees in a particular forest are normally distributed with a mean of 18.4 inches and a standard
q1. show that for a sample of n 39 the smallest and largest z values are - 1.96 and 1.96 and the middle i.e. 20th z
Two movies were screen-tested at two different samples of theaters. Mystic River was viewed at 80 theaters and was considered a success in terms of box office.
Does the Christian faith have anything distinctive to say about the practice of statistics as a science?
Define the following terms:- expository passage - illustration- argument from example- explanation- explanandum- explanans- conditional statement- antecedent- consequent.
Find the lower, middle, and upper quartiles of this data set. Also find the 10th, 15th, and 65th percentiles. What is the interquartile range?
At α = .05, is there a difference in variances? Illustrate all steps clearly, including the illustration of the decision rule.
Choose a large Middle Eastern organization that sells a product or multiple products. In a 4-6 page paper, not including the cover and reference pages, first provide an overview of the company. Then, analyze that company and its products in terms ..
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