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The National Center for Health Statistics reported that of every 883 deaths in recent years, 24 resulted from an automobile accident, 182 from cancer and 333 from heart disease.Using the relative fr
Compute the mean of the distribution of sample means and the population mean. Compare the two values. Compare the dispersion in the population with that of the sample means.
A survey of 85 families showed that 36 owned at least one DVD player. Find the 99% confidence interval estimate of the true proportion of families who own at least on DVD player. Place your lower an
In a particular region of Cape Cod, it is known that lobstermen trap on average of 32 pounds of lobster per day with a standard deviation of four pounds.
This means that spending a longer amount of time in prison causes people to become more aggressive. Please explain your response.
Based on what you have as the example, write a brief description of how statistics can enrich and represent the results of a study, and an explanation of how statistics can be used to misrepresent t
A two-factor study with two levels of factor A and three levels of factor B uses a separate sample of n = 5 participants in each treatment condition. How many participants are needed for the entire
If the correlation between X and Y is r = 0.00, then SP = 0 and the regression equation is :
Between 1965 and 2007, there were 95 major hurricanes (category 3 or more) in the Atlantic basin. Assume that hurricanes are independent and the mean has not changed. What is the mean number of majo
Can we use probability models based on Bernoulli trials to investigate the following situations? Explain.
A cabinet has three drawers. In the first drawer there are two golds balls. In the second drawer there are two silver balls. In the third drawer there is one silver and one gold ball. A drawer is se
Compute the weighted average of chlorinie compound concentrations (mg/l) for this ecological system. Suppose the EPA has established an average chlorine compound concentration target of no more than
A scientist working for Monsanto, a develper of genetically engineered soybean seeds, tests to see if genetically engineered soybeans are safe. Explain the bias in this situation.
According to a 2007 America's Families and Living Arrangements Census Bureau survey, 52.1 million children lived both of their parents in the same household, whereas 21.6 million lived with at most
A student of the author surveyed her friends and found that among 20 males, 4 smoke and among 30 female friends, 6 smoke. Give two reasons why these results should not be used for a hypothesis test
The diameters of grapefruits in a certain orchard are normally distributed with a mean of 5.11 inches and a standard deviation of 0.49 inches. Show all work.
Predict the expected yield of oats with 95% confidence if 285 kg of nitrogen per hectare are applied. Estimate the average increase in yield for an increase of 115 kg of nitrogen per hectare with 99%
Calculate the sample means and standard deviations. Calculate the control limits for-chart s-chart. What can you say about this process? Estimate the population mean and standard deviation.
Given the linear correlation coefficient r and the sample size n, determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlat
Find the probability that the chip is defective, then, given that the chip is defective, give the conditional probability for each line.
Describe the sampling distribution for X based on random samples of 25 one foot sections. (you need to name the distribution and give the mean and standard deviation of the distribution.)
Farming is a very risky business because of the possibility that bad weather might cause financial ruin. Farmers usually insure their crops each year against possible losses resulting from bad weath
Consider two random variables with standard deviations equal to 1.5 and 2.1. The standard deviation of the average of these two variables is equal to 1.7. The covariance is then equal to:
An agricultural experimenter, investigating the effect of the amount of nitrogen x applied in 45 kg per hectare on the yield of oats y measured in 35 litres per hecrare, collected the following data