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In a x^2 test of independence the null hypothesis is that
A)there is not an association
B)there is an association
C)the random variables are dependent
D)each element of each set has the same probability of occurence
E)None of these
A journal article was recently published about typing skills, and in this article, the results of a national typing test were reported. The authors of the article claim that the population of those considered to be "skilled" typists can type an avera..
A screening test for a newly discovered disease is being evaluated. In order to determine the effectiveness of the new test, it was administered to 900 workers; 150 of the individuals diagnosed with the disease tested positive.
writenbspa 2 page critique of an online user manual. you can download a usernbspmanualuser guide for a product of your
A particular department store knows from past experience that 17% of their customers have the store's credit card. What is the probability that out of the next 120 customers that at least 15% have the store's credit card? (please express your answer ..
Cost of flying listed below are costs
Direct mail advertisers send solicitation junk mail to thousands of potential customer hoping that some will buy the company's product. The response rate is usually quite low. Suppose a company wants to test the response to a new flyer and sends it t..
1)Discuss the following concepts and give examples from everyday life in which you might encounter each concept. Hint: For instance, consider the ?experiment? of arriving for class. Some possible outcomes are not arriving (missing class), arriving on..
Allergic reactions to poison ivy can be miserable. Plant oils cause the reaction. Researchers at Allergy Institute did a study to determine the effects of washing the oil off within 5 minutes of exposure. A random sample of 1000 people with known all..
You are considering investing in a company. The company claims for the past few years the average monthly return on such an investment has been $870 with a standard deviation of $50. You sample 30 investors and determine the sample average return to ..
Define the hypothesis and find the standard error of the difference in the means also find the test statistic - Determine the required sample size to be able to use a 99% confidence interval.
Which of the following formulas would you use to find the probability that a sample mean is larger than some given value? z = (x - µ) ÷ σ µ = ∑x ÷ N
State the Null Hypothesis, State the Alternatice Hypothesis and state the Level of significance - State the Test Statistic - Does the data indicate that the mean remission time using the new drug is different from 12.5 week at a level of significanc..
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