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Recent scientific literature has suggested a link between exposure to the endocrine disruptor Bisphenol A (BPA) found ubiquitously in many plastic materials, and precocious puberty in adolescents. The transmission is maternal to child during the last weeks of gestation. Scientists can trace the presence of BPA in children for years after birth and believe that it may be the cause for early onset of puberty in young girls. Suppose a researcher collects a SRS of 92 girls with high exposure rates of BPA and follows them through puberty. The sample average age of puberty was 9.7 years. Assume the national average age for onset of puberty is 11.2 years with a population standard deviation of 0.6 years. Does the researcher have sufficient evidence at the alpha level of 0.05 to determine if the exposure to BPA has led to a decreased age of puberty in girls? Explain why the hypothesis, z statistic, and p-value explain your conclusion.
three points are chosen at random on a circle of unit circumfrence. what is the probability that the triangle defined
About what percent of x values lie between the first and third standard deviations(both sides)?
What percentage of observations of a normal distribution are represented by the mean plus or minus 1.96 standard deviations?
Until about 1830, most western settlers were southerners who settled near the tributaries of the Ohio-Mississippi River system. True or False?
The average age of the women was 36.97 with a standard deviation of 8.893. If a 95% confidence interval is calculated to estimate the difference between the two average ages, what is the margin of error? Assume both population standard deviations ..
assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of 2050
1.Distinguish some things to consider when writing a casual analysis 2.Analyze and discuss some important things to consider when writing a compare/contrast essay.
In exercises let X1 and X2 be independently and uniformly distributed over the intervals 0 to 1.
The mean increase is $332, and the standard deviation is $108. Give a 99% confidence interval for the mean amount of the increase. Does omitting the annual fee induce customers to charge more on their credit cards?
For the following data: 9, 3, 5, 11, -1, 7, 1, 7. What is the sample variance of the data? What is the sample standard deviation of the data? What is the mean? What is the median
when the background music was slow the mean amount of bar purchases for a sample of 17 restaurant patrons was 30.47
Find the mean and the standard deviation of the sampling distribution of x, and find an interval containing 95.44 percent of all possible sample mean returns.
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