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Mating habits of snails. Genetical Research (June 1995) published a study of the mating habits of hermaphroditic snails. The mating habits of the snails were identified as either self-fertilizing or cross-fertilizing.
The effective population sizes of the two groups were compared. The data for the study are summarized in the table.
Geneticists are interested in comparing the variation in population size of the two types of mating systems. Conduct this analysis for the researcher. Interpret the result.
A die is rolled twice. Let X denote the sum of the two numbers that turn up, and Y the difference of the numbers (specifically, the number on the first roll minus the number on the second). Show that E(XY ) = E(X)E(Y ). Are X and Y independent?
according to cnn business partner careerbuilder.com the average starting salary for accounting graduates in 2008 was at
Below is computer output from SPSS, the package used in the text. The table below has descriptive statistics for each variable measured the 5-point scale, with 5 being "Strongly Agree" and 1 being "Strongly Disagree" (Favorable = "SA or A")
Perform exploratory data analysis on all variables in the data set. Realizing that you have six groups, be sure that your exploratory analysis is broken down by group. When possible, include appropriate graphs to help illustrate the dataset.
a study is run comparing hdl cholesterol levels between men who exercise regularly and those who do not. the data are
Construct a 95 percent confidence interval for the population proportion of positive drug tests. Why is the normality assumption not a problem, despite the very small value of p?
Assuming that 6 in 10 automobile accidents are due mainly to a speed violation; find the probability that among 8 automobile accidents 6 will be due mainly to a speed violation
The seller offered free shipping to 25 customers for randomly selected products and then collected and reviewed the customers' approval scores. What type of statistical analysis is most appropriate to determine whether the offering of free shippin..
The F-test cannot be used to answer whether or not there is a significant difference between the means.
Convinving evidence at the .05 significance level to support the claim that the actual number of cards is an undergrads wallet is greater than 4.09. state the null and alternative hypothesis.
on the average there are 5 messages sent per hour to a computer bulletin board. on a period of three hours find the
for binomial distribution with n 10 and probability of success p 0.4 find probability of less than 3 successes x lt 3
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