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Suppose that you wish to compare the characteristics of tuberculosis meningitis in patients infected with HIV and those who are not infected. In particular, you would like to determine whether the two populations have the same mean age. A sample of 37 infected patients has mean age of 27.9 years and a standard deviation of 5.6 years; a sample of 19 patients who are not infected has mean age = 38.8 years and standard deviation = 21.7 years.
A. What is your calculated t-test value? (Two decimal places, please.)
B. enter the appropriate degrees of freedom to use.
Note: Use excel and explain why you used a certain method to solve this problem.
a ponderosa pine forest in colorado has a pine beetle infestation. the beetles bore into a tree and carry a fungus
what are the roles of financial intermediaries differentiate between direct and indirect
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
1. consider the random variable x with the probability mass function pie-22iiwhat is px0?2. consider a fair coin. we
He wants to be 95% confident that his estimate is correct. If the standard deviation is $1050, how large a sample is needed to get the desired information and to be accurate within $200?
If it is determined that there is no difference between the population mean being represented by the sample and the mean of the population at large, then:
bob looks in the classified ads for rents on one-bedroom and two-bedroom apartments. he writes down the figures for 10
an mp3 player is loaded with 60 musical selections 24 rock tunes 21 jazz tunes and 15 blues tunes. the player is set on
An industrial chemical to retard the spread of fire in paint has been developed. From past experience, 48% of sales calls will result in an order.
Use simple exponential smoothing with α = 0.3 to forecast battery sales for February through May. Assume that the forecast for January was for 22 batteries.
Identify the possible values of X, then state whether this is a discrete or a continuous random variable. b.) Create a probability table for X.
in 2008 a university in the midwestern united states surveyed its full-time first-year students after they completed
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