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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 levels.
She concluded that encouraging teachers to be properly attired will increase academic performance. Do you agree or disagree with her conclusion? Support your answer.
Based on this reality, the one-way analysis of variance provides the most effective tool for determining if there are any statistically significant differences in the population.
Use Friedman test to find out whether there is evidence for significant difference between two population variance. Use .05 level of significance.
Find out the probability that: First electric brush chosen is defective?
It is suspected that a random variable has a normal distribution with a mean of 6 and a standard deviation of 0.5. After observing several hundred values, we find that the mean is approximately equal to 6 and the standard deviation is close to 0.5..
question how does horsepower and weight affect the mileage of family sedans?nbsp data from a sample of twenty 2010
Excess postexercise oxygen consumption (EPOC) describes the energy expended during the body's recovery period immediately following aerobic exercise.
What is the probability that the variable will take the value 2? What is the mean of the distribution?
Fifty samples of size 600 were drawn from a manufacturing process and the number of defectives in each sample was counted.
the american council of education reported that 47 of college freshmen earn a degree and graduate within five years
one person has 3 dollars to gamble each time he uses only one dollar the probability is 60 to lose and 40 to win. if he
Given an infinite population with a mean of 75 and a standard deviation of 12, the probability that the mean of a sample of 36 observations, taken at random from this population
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