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Suppose foreigners spend $7 billion on American exports in a given year and Americans spend $5 billion on imports from abroad in the same year.
What is the amount of America's net exports?
The mean height of women in a country (ages20-29)is 64.5 inches. A random sample of 75 women in this age group is selected. What is the probability that the mean height for the sample is greater than 65inches? Assume σ=2.66
an accounting firm annually monitors a certain mailing services performance. one parameter of interest is the
Comparing the answers to (a) and (b), for what range of values of t statistics would the hypothesis test conclusion differ between using the t or normal
Compute Pearson's correlation coefficient between age and amount spent on this particular product.
Determine the range of values containing 50% of the population of x. From a large sampling (N>5000), we find that x has a mean value of 5.2 units and a standard deviation of 1.0 units.
Make a scatterplot of the data using population as the explanatory variable and open space as the response variable.- Is it reasonable to fit a straight line to these data? Explain your answer.
Maxima and minima of normal variables. Calculate the expected values of max (X, Y) and min (X, Y).
According to the Internal Revenue Service, income tax returns one year averaged $1,332 in refunds for taxpayers. One explanation of this figure is that taxpayer
In a random sample of 200 baby snakes 92 were found to be male. What is the probability that for the whole population of snakes more than 50% are male?
How many students must be randomly selected to estimate the mean weekly earnings of students at one college?
How heavy does a box have to be in order for the box to be labeled overweight?
The U.S. trade deficit with Canada (billions of dollars) from 2000 through 2007 is reported as shown in the table. Using exponential smoothing and the smoothing constant a = 0.7, what deficit would have been forecast for 2008? Source: World Almanac..
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