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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.
The ACT is also distributed with meanof 21 and standard deviation of 4.7. Rachel wants to be in the 98th percentile on each test. What scores must she recieve on each exam?
the research question is there a difference in preference between text a and text b? the table below presents the data.
as part of a public health survey a random sample of college students were asked about their weekly drinking habits.
A researcher administers a treatment to a sample of participants selected from a population with µ = 80. If the researcher obtains a sample mean of M = 88, which combination of factors is most likely to result in rejecting the null hypothesis?
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmis..
message 1. a survey of the number of calls received by a sample of southern phone company subscribers last week
How many statistics professors must be randomly selected for IQ tests if we want 99% confidence that the sample mean is within 2 IQ points of the population mean?
A company has been using the same advertising strategy for a number of years and over that time has had relatively constant monthly sales.
Use a two proportion z-test to perform the required hypothesis test. State the conclusion.
the number of ratios in each household in a country. is this a population or sample?the ages of three families of
Mmean number of outgoing calls in a random selection of calls? Also, compute the standard deviation. In a selection of 12 calls, what is the probability that less than 3 were outgoing?
consider an experiment in which our sample space is s1234567.also e1124 e223456 e37. describe the outcomes in each one
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