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Biology and Environmental Science
The bulk density of soil (x, in g/cm3) affects plant growth, specifically, how easily roots can penetrate the soil. A group of carrot growers conducted a study to compare soil bulk density with soil texture (y), measured on a scale from 1 to 10, with 1 being very sandy soil and 10 corresponding to clay. A random sample of plots was obtained, and the data were recorded. Compute Spearman's rank correlation coefficient, and use this value to describe the relationship between these two variables.
a machine is producing metal pieces that are cylindrical in shape. a sample of pieces is taken and the diameters are
Specify which of these coefficients suggests the strongest relation between the two variables as well as which coefficient suggests the weakest relation.
In all, n = 100 bottles were tested. Give two transformations that are suitable transformations to try that might achieve a distribution somewhat closer.
If n=15 and p=0.4, then the standard deviation of the binomial distribution is 3.6
for a particular card game a standard deck of cards has all of the aces kings queens and jacks removed. among the 36
In an analysis of variance summary table, if the mean square between = 35 and the mean square within = 28, then the null hypothesis of the groups having the same mean is?
two researchers wiebe and bortolotti in 2002 examined the color in tail feathers of northern flickers. it sometimes
Teen smoking 2006. The Centers for Disease Control and Prevention say that about 23% of teenagers smoke tobacco (down from a high of 38% in 1997).
For each of the ten possible samples listed in part (a) of Exercise, give the value of the range R = H - L, where H is the highest number and L is the lowest.
Explain the effect - Use post hoc tests when necessary and Is there an interaction between your two variables?
To report the results of a z test, we report the test statistic, p value, and effect size of a hypothesis test.
Federal health officials estimate that 67% of all those over age 65 receive the flu vaccine. Suppose 8 people over 65 will be randomly selected. Which of the following is the expected number that will be vaccinated in such a random sample of 8 peo..
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