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A jar contains marbles of different colors: 4 white, 6 black, 6 red, and 4 blue. On two random drawings, without replacement, find the probability that the first is black and the second is white. Assume that the draws are independent.
If you are using the method of least squares for fitting trends in an annual time series containing 25 consecutive yearly values,
A multiple regression equation for list price of homes in certain community in USA is=170,000 -850 X 1 + 28,000 X 2 , where X 1 signifies age in years and X 2 signifies number of rooms.
Find the test statistic P-value, and critical value, and state the final conclusion.
Store used ANOVA to test if mean sales for each credit card were equal. What are the degrees of freedom for F statistic?
Write an expression for the probability that during a given 1-min period, all of the operators receive exactly the same number of requests.
Explain the purpose of the chi-square test for independence. Provide some practical examples where this test might be used in business.
Under older Federal Aviation Administration rules, airlines had to estimate the weight of a passenger as 185 pounds. That amount is for an adult traveling in winter, and it includes 20 pounds of carry-on baggage.
At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. Is this a 1 or 2 tail test?
Assume that another counselor decided to extend the aforementioned study by collecting data on 14 children. His study yielded the following results:
Assume that the smiling time of eight-week old babies, in seconds, follows a uniform distribution between 0 and 23 seconds, inclusive. This means that any smiling time from 0 to and including 23 seconds is equally likely.
At the 5% level of significance, can we infer that branch A has a significantly higher proportion of satisfied customers than branch B?
With a confidence of 95%, what is the margin of error for the proportion of all carp that would incorporate the gene into their DNA?
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