These data will be used to assess the prevalence of DDT in drinking water.Īfter selecting specific women to be sampled, researchers measured the level of DDE contamination for each of these randomly selected women. Global Solutions Unlimited (GSU) will analyze the data from this study. When a pregnant woman has a contamination level as low as 10 mg/kg of DDE in her body, she is much more likely to give birth to an underweight baby or to deliver prematurely (Wells & Leonard, 2006).Ī study of 45 pregnant women who have been exposed to DDT / DDE was conducted using a convenience sample (Bornman, MS. Scientists have shown that DDT and its metabolites cause reproductive problems in humans and other animals. When DDT is broken down in humans, DDE is one of the metabolites that remains from the original DDT.
A metabolite is the byproduct that occurs when our body breaks down a substance. Unfortunately, this pesticide does not break down quickly in nature and is very harmful to humans.Ī metabolite of DDT (called DDE) is also very dangerous. In an attempt to curb the spread of malaria and save lives, the pesticide DDT was used for many years to control the insect population, even indoors. Mosquitoes and other biting insects carry malaria. If the data set contains 40 data values, approximately how many of the data values will fall within the range of 6.5 to 13.Case Study: DDT’s Negative Impact on Pregnant Women The mean is 10 and the standard deviation is 3.5. If one starts assembling at 4 pm, what is the probability that he will finish before the com The assembly time for the toy follows a normal distribution with a mean of 75 minutes and a standard deviation of 9 minutes. What is the range in minutes 68% of the batteries will last? What is the range in minutes? How long, approximately 99.7% of batte
The life expectancy of batteries has a normal distribution with a mean of 350 minutes and a standard deviation of 10 minutes. Assuming a normal distribution, how many women ran more quickly than Joan? Joan's finishing time for the bolder boulder 10 km race was 1.77 standard deviations faster than the women in her age group. Is there evidence to show that this group hasĭecide by calculation how many candidates out of a total of 1000 candidates for the position of CEO meet the eligibility requirements for the desired performance of this top management position with at least 67% probability - provided, of course, that the A random sample of 50 students was given the same test and showed an average score of 83.20. a) What is the probability that a randomly selected light bulb will have a lifespan of more than 320 hours? b) To what value of L hours can the laĪ standardized test was administered to thousands of students with a mean score of 85 and a standard deviation of 8. The lifetime of a light bulb is a random variable with a normal distribution of x = 300 hours, σ = 35 hours. How many students will score less than 75? 4 Access time for secondary datįive thousand students take an exam with a mean of 59 and a deviation of 8.
3 The most passive method of data collection is observation. The most frequent observation in a data set is known as the mode. Write TRUE OR FALSE for each question: 1 Standard deviation is a measure of central location. What are students at the bottom of the 20% having what GPA? The average GPA is 2.78, with a standard deviation of 4.5. three claims in a given week, more than four claims in a given Assuming that a Poisson distribution can model the number of claims, find the probability it receives. An insurance company receives, on average, two claims per week from a particular factory.
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