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The average life expectancy in the United States, L, has been rising steadily over the past few decades, as shown in the table below. Let t be the number of years since 1920, (so t=0 represents the year 1920). Year 1920 1930 1940 1950 1960 1970 1980 1990 Life expectancy 53.7 56.1 59.7 62.2 66.6 69.2 71.8 74.1 (a) Find the equation of the regression line.
a professor at a loca community noted that the grades of hi s students were normally distrubuted with a mean of 74
How large a sample should you take if you want to be 95% confident of the results and you want the error of the confidence interval to be no more than .05?
Assign probabilities to the sample points and then find the probability that the first envelope purchased contains less than $100.
an airline has classified its customers as high-volume travelers assumed to be business travelers or low-volume
an internet server conducted a survey of 400 of its customers and found that the average amount of time spent online
In a sample of 55 mice, a biologist found that 42% were able to run a maze in 30 second or less. Find the 90% limit for the population proportion of mice who can run a maze in 30 second or less.
a a manufacturer of golf equipment wishes to estimate the number of left-handed golfers in the u.s. how large of a
Student A transfers to FSU and has a cholesterol reading of 199. What is the probability of observing a cholesterol reading of 199 or less?
Estimate the population in 1600 and graph the population trend from 1600 through to 2000
A traffic study at one point on an interstate highway shows that vehicle speeds are normally distributed with a mean of 61.3 mph and a standard deviation of 3.3 mph.
Using the z table in Table E of Appendix C, what are the critical values for a two-tailed test when a = 0.03 .
a survey has discovered that the amount of money that a family of four spends on food per week is approximately
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