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Observers in Texas watched children at play in eight communities. Of the 814 children seen biking, roller skating, or skateboarding, only 14% wore a helmet.
a) Create and interpret a 95% confidence interval.
b) What concerns do you have about this study that might make your confidence interval unreliable?
c) Suppose we want to do this study again, picking various communities and locations at random, and hope to end up with a 98% confidence interval having a margin of error of ±4%. How many children must we observe?
The deadly Ebola virus is a threat to both people and gorillas in Central Africa. An outbreak in 2002 and 2003 killed 91 of 95 gorillas in seven home ranges in the Congo. Find the correlation r between distance and time. Find the regression equati..
Data collected by a child development scientist produced a 95% confidence interval for the mean age, μ (in weeks) at which babies began to craw as [21.4, 31.6]
Uniformly distributed in the interval -0.5 cents to 0.5 cents. What is the probability that the round-off error exceeds 0.3 cents or is less than -0.3 cents?
Which conditional distributions do these statistics refer to, those of y at given catagories of x, or those of x at given categories of y? Set up a table with race of murderers as rows and race of victims as columns, showing the two conditional di..
Box A contains three balls with colors red, green and blue and box B contains a balls with colors red, yellow ,blue, white and brown A box is chosen and a ball is picked. What is the probability that the ball may be brown is? What is the probability ..
Using the information from above, what is the probability that fewer than 45 of the claims have been padded? Round your answer to the nearest thousandths place.
Does either of the plots have a center that is very close to the true average?- Does either of the plots have a center that is larger than the true average?
suppose that 4 of the 2 million high school students who take the sat each year receive special accommodations because
question 1 in a simple random sample from a population of several hundred thats approximately normally end of exam
Random sample of 100 voters showed that 55 of those sampled will vote for her. Is it likely that her assertion is correct at the 0.05 level of significance?
Montarello and Martens (2005) found that fifth-grade students completed more mathematics problems correctly when simple problems were mixed in with their regular math assignments.
List the possible realizations of the random vector; - Determine the probability of each realization; - Determine the mean vector;
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