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A certain scientist concluded his study in fertility control as follows: "So far one result has emerged from the before-and-after survey, and it is a key measure of the outcome: at the end of 1962, 14.2% of the women in the sample were pregnant, and at the end of 1963 (after the birth-control campaign) 11.4 % of the women (in a second independent sample) were pregnant, a decline of about one fifth." If the samples (both before and after) included 2500 women, what statistical qualification would you add to the above statement, in order to make its meaning clearer?
an examination of rejects shows at least 7 problems. a frequency tally of the problems follows. construct a pareto
Consider a constraint that represents the use of an essential nutritional resource in an LP. There are 3 variables-- X, Y, and Z. The resource constraint is a nutritional requirement for iron in a diet. It states that each unit of each variable..
For the sample of men, performance on the simulator task declined by an average of 2.9 points with s = 4.1. Is this a statistically significant change? Use a two-tailed test with = .05.
Please complete ONE of the following assignments, incorporating ideas and concepts from the week's lecture and/or articles. Please feel free to incorporate outside resources as well. When submitting your assignment, please indicate which of the th..
What type of method was used in this study?- Can you conclude that people become more politically conservative as they get older? Why or why not?
Specify the competing hypotheses to deter mine whether a patient's survival depends on the time at which he/she experiences cardiac arrest.
A sample of 81 account balances of a credit company showed an average balance of $1,200 with a sample standard deviation of $126. You want to determine if the mean of all account balances is significantly different from $1,250. Use a .05 level of ..
Looking at the data, the manufacturer is incorrect in its label claim. Perform hypothesis testing to prove or disprove it. Is the manufacturer correct in its label claim? Explain.
give two sets of four numbers that have the same mean but different median.give two sets of four numbers that have the
Lefties again. A lecture hall has 200 seats with folding arm tablets, 30 of which are designed for left-handers.
Discuss how the null and alternative hypothesis for one-sample testing differs from two-sample testing; and explain how these two hypothesis' are the same, and provide a numerical example?
A random sample obtained from a population has a mean of µ=100 and a standard deviation of σ = 20. The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean ..
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