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The fertility rate of a country is defined as the number of children a woman citi7en bears, on average, in her lifetime. Scientific American (Dec. 1993) reported on the declining fertility rate in developing countries. The researchers found that family planning can have a great effect on fertility rate. The table on page 514 gives the fertility rate, y, and contraceptive prevalence, x (measured as the percentage of married women who use contraception), for each of 27 developing countries. A SAS printout of the simple linear regression analysis is also provided on p. 504.
a. According to the researchers, "the data reveal that differences in contraceptive prevalence explain about 90% of the variation in fertility rates." Do you concur?
b. The researchers also concluded that "if contraceptive use increases by 15 percent, women bear, on average, one fewer child." Is this statement supported by the data'? Explain
the dean would like to get a summary of gender and final grade for this class. discuss the forms of numerical and
(a) In how many ways can the committee be chosen so that the same amount of men and women are chosen? (b) What is the probability that the same amount of men and women are chosen?
Calculate the 90% confidence interval for the population mean of health men's pulse (sphygmus) in mountainous area.
The 90 percent confidence interval for the population mean is to (Round your answers to 3 decimal places.) Would it be reasonable to conclude that the population mean is 22 eggs? What about 24 eggs?
A machine is designed to produce gaskets with a mean inside diameter of 0.375 Inch. State the rejection region for the test statistic. Use an α = 0.01 level of significance. Suppose that a random sample of n = 20 gaskets had a mean of 0.373 inches. C..
Student team examined parked cars in 4 different suburban shopping malls. One hundred vehicles were studied in each location. Research question : At α = . 05.
What is the relationship between confidence intervals and hypothesis testing? How are they the same? How are they different?
q1. both undergraduates and postgraduates can use the university cafeteria. each diner can choose between buying a
A uniform probability distribution is a continuous probability distribution where the probability that the random variable assumes a value in any interval of equal length is.
the following data show the number of fruit fly killed at varying concentrations of nicotine.the number of ies killed
using the approximations for normal curves what percentage of scores fall between the mean and one standard deviation
Paul has calculated the indifference probability for the lottery having a payoff of $160K with probability p and -$80K with probability (1-p) as follows:
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