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Decide first whether the data are qualitative or quantitative. Unless mentioned otherwise, no assumption has been seriously violated, and, therefore, the appropriate test should be selected from amount t, F, or x2 tests. Specify the precise form of the test. For example, specify that the t test is for two population means with related samples, or that the x2 test is for two variables, of that the F test is for repeated measures. For the following question:
An investigator wishes to determine whether, for a random sample of drug addicts, the mean score on the depression scale of a personality test differs from that which, according to the test documentation, represents the mean score for the general population.
What test is needed (select from above) to analyze the above scenario? Is the data qualitative or quantitative?
Consider the family with five children described in Exercise 11. (a) I f i t j s known that the youngest child in the family has blue eyes
What was the name of the blind Benedictine monk who allegedly invented Champagne?
Let X be a random variable with probability density function 630x4(1 - x)4, 0 1,f(x) = 0, otherwise.
Serum cholesterol levels were taken from a population of 10,000 college students. The results were normally distributed. Males had a mean of 195 and a standard deviation of 10. Females had a mean of 185 and a standard deviation of 12.
From the data for the five U.S. cities that follow, construct a line graph that shows the relationship between elevation above sea level and mean January temperature. The latitudes of the five cities are almost equal; all are within 1 degree of 35..
The following table lists their brightness, in lumens. Calculate and comment on a 99% confidence interval for the brightness.
Give an example of a stationary Markov chain with a small number of states such that P.XnC1 D xnC1 jXn xn; Xn-1 xn-1;::: ; X0 x0/ D P.XnC1 D xnC1 jXn xn /is not true for arbitrary x0; x1;::: ; xnC1.
In a case/control study, the investigators examined the medical records of the last 100 consecutive patients who had been treated for colon cancer.
(a) State the hypotheses to be tested. (b) Calculate the expected frequencies.
Assume that the distribution of inter-renewal intervals for one state j is arithmetic with span d. Show that the distribution of inter-renewal intervals for all states is arithmetic with the same span.
For the hard drive data in Exercise 2, some research on the prices discovered that the 200 GB hard drive was a spe- cial "hardened" drive designed to resist physical shocks and work under water. Because it is completely different from the other dr..
Let Ii be the input current to a transistor and I0 be the output current. Then the current gain is proportional to ln(I0yIi ). Suppose the constant of proportionality is 1(which amounts to choosing a particular unit of measurement), so that current
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