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Find the average and the SD for the list {11, 15, 9, 7, 3}. Using the average and SD you found, convert the values in the list to standard units. For each member of the list, state how many SDs it is above or below the average of the list. Without carrying out and calculation, estimate - for this list in standard units - the average and standard deviation.
Using a test, 80% of Down's Sydrome cases can be identified, while 5% of normals are detected as positive. What is the sensitivity and specificity of the test?
Suppose that X is a discrete random variable with probability mass function: PX(x)= (1/2)^((2x/ pi)+1) , where x =0, pi/2, pi, 3pi/2, 2pi... , and equals to 0 otherwise.
For a sample of 120 students selected at random, what is the mean and variance of the number of students who watched this event?
Spanish a 3 credit hour course. If 4 grade points are assigned for an A, 3 for a B and 2 for a C, what is the weighted mean for the semester grades?
Using your experience from previous or current employment, provide a business example where you could use a t-test to assist in a business decision. State the null and alternative hypothesis.
the national study of the changing workforce conducted an extensive survey of 2958 wage and salaried workers on issues
The heights were measured for nine supermodels. They have a mean of 67.1 and a standard deviation of 2.3 in. Use the traditional method and a 0.01 significance level to test the claim that supermodels have heights with a mean that is greater than ..
A state meat inspector in lowa has been given the assignment of estimating the mean net weight of packages of ground chuck labeled " 3 pounds." Of course, he realizes that the weights cannot be precisely 3 pounds.
we wish to estimate the mean using a sample size of n = 49. Find the probability that we could be correct within 1kg/m 2 .
When there is more than two predictors, one can no longer graph the tted surface in the usual way. How then does one make sense of a surface in more than three dimensions?
in a particular occupation a random sample of 210 men found that 65 smoked. in a random sample of 240 women 87 smoke.
can a pretest on mathematics skills predict success in a statistics course? the 82 students in an introductory
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