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Question: MEDICAL RESEARCH Based on data obtained from the National Institute of Dental Research, it has been determined that 42% of 12-yr-olds have never had a cavity, 34% of 13-yr-olds have never had a cavity, and 28% of 14-yrolds have never had a cavity. Suppose a child is selected at random from a group of 24 junior high school students that includes six 12-yr-olds, eight 13-yr-olds, and ten 14-yrolds. If this child does not have a cavity, what is the probability that this child is 14 yrs old?
Both SAT and ACT scores are normally distributed. What is the probability that a randomly selected high school senior's score on the mathematics part of the SAT will be more than 630?
The standard deviation is 2.5 pounds. Find the probability that the mean of a sample of 55 families will be more than 13 pounds.
Nest humidity and fleas. In the setting of Exercise 28.7 (page 28-16), researchers showed that the square root of the number of adult fleas y has a quadratic relationship with the nest humidity index x. Specify the population regression model for ..
Let N denote the number of arrivals of a Poisson process of rate λ over the interval (0, T). Given N = n, let S1,..., Sn denote the corresponding arrival times. Prove that
The average age of the women was 45.582 with a standard deviation of 5.143. He uses this information to calculate a 95% confidence interval for the differnce in means, (-11.41, -5.422). The best interpretation of this interval is which of the foll..
A report states that 46% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 3% with 96% confidence?
Conduct a simulation to compare the various bootstrap con?dence interval methods. Let n = 50 and let T (F ) =( (x - µ)3dF (x)/σ3 be the skewness.
A recent research report shows that the percentage of college students who have been reported for plagiarizing has reached 30% each in the colleges of Education, Arts and Sciences, and Business, but only 10% in the School of Law.
the corporate lawyer a magazine for corporate lawyers would like to report the mean amount earned by lawyers in their
Formulate the hypotheses to test to see if the mean of the population is at least 12 ounces.
Basic concepts. For each of the following, answer the question and give a short explanation of your reasoning.
Identify Independent and Dependent variable being investigated. Formulate the hypothesis statement regarding your research issue.
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