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At a used-book sale, 100 books are adult books and 160 are children’s books. Of the adult books, 70 are nonfictions while 60 of the children’s books are nonfiction. A book is selected at random.
i) What is the probability that the selected book is an adult book or a fiction book?
ii) Are the events A : ‘selecting an adult book’ and B : ‘selecting a fiction book’ independent events?
A high-school department made a change in its curriculum. What are the results of the test (do the data indicate that the new program results in a lowering of math skills). Sh
Set up a hypothesis test - State the null and alternative hypothesis and Confidence intervals of scores and the z or t intervals. Do a P test. Are the two tests consistent
A high-school department made a change in its curriculum. One of the instructors in the department suspected that the change would result in a lowering of math skills. Set u
A high-school department made a change in its curriculum. Set up a hypothesis test. What are the results of the test (do the data indicate that the new program results in a lo
Formulate the hypotheses that could be used to determine whether the percentage of supermarket shoppers who believe that the supermarket Ketchup was as good as the national
In contrast, the real millionaires, in terms of savings and investments, frequently come from "unglamorous" professions (particularly teaching), own unpretentious homes and
What action should plant management take at the 5% level of significance - What is the probability that the null hypothesis would be rejected if the population defective rate
State the results of the research, describing how the researchers determined whether or not the results are statistically significant and describe the differences in the res
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