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Does the level of precipitation predict violence? Dubner and Levitt (2006b) reported on various studies that found links between rain and violence. They mentioned one study by Miguel, Satyanath, and Sergenti that found that decreased rain was linked with an increased likelihood of civil war across a number of African countries they examined. Referring to the study's authors, Dubner and Levitt state, "The causal effect of a drought, they argue, was frighteningly strong."
a. What is the independent variable in this study?
b. What is the dependent variable?
c. What possible third variables might play a role in this connection? That is, is it just the lack of rain that's causing violence, or is it something else?
The stories were based on reports that someone had spun the coin 250 times and gotten 140 heads that s 56% heads. Do you think this is evidence that spinning a euro is unfair? Explain.
Consider a simple model of an automobile driver following another car on the highway at high speed. The model shown in Figure E9.20 incorporates the driver's reaction time, T. One driver has T = 1 s, and another has T = 1.5 s.
Let random variable X represent number of heads on first toss and y total number of heads from three tosses. Sketch tree view with X as first level and Y/X as second level and determine conditional probability p(Y=2/X=1).
What is the median sugar content?- What is the range of the sugar contents of these cereals.- Describe the shape of the distribution.
Explain the notion of the extended process and its significance. Discuss this in the context of the given organizations:
Customers arrive at the Veryfast Bank as a Poisson process of rate λ customers per minute. Each arriving customer is immediately served by a teller. After being served, each customer immediately leaves the bank.
A population has a standard deviation of 16. If a sample of size 64 is selected from this population, what is the probability that the sample mean will be within 2 of the population mean?
a player of a video game is confronted with a series of opponents and has an 83 probability of defeating each one.
for a medical study a researcher wishes to select people in the middle 60 of the populartion based on blood pressure.
The problem related to Statistics and it defines about calculation of average of students test score and representing it on a graph.
Professor Foley conducted a cola taste test.- What are the potential problems with this experimental design and the procedures used?
Two student groups of 40 students each scored, respectively, between 45% to 85% (first group) and 55% to 90% (second group) on the test. A paper is randomly chosen from the two groups and shows the score of 78%. What is the probability that the pa..
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