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Test whether there is more variation using variance test.
A real estate agent in the coastal area of Georgia wants to compare the variation in the selling price of homes on the oceanfront with those one to three blocks from the ocean. A sample of 21 oceanfront homes sold within the last year revealed the standard deviation of the selling prices was $45,600. A sample of 18 homes, also sold within the last year, that were one to three blocks from the ocean revealed that the standard deviation was $21,330. At the .01 significance level, can we conclude that there is more variation?
Use a 0.05 significance level to test the claim of a cereal lobbyist that the mean for all cereals is less than 0.3g.
Carry out the suitable hypothesis test, at alpha = .05, to find out whether there is a relationship between school/work and stress.
Define the decision rule. Calculate the value of the test statistic.
Suppose you had flipped a fair coin 19 times and "tails" had come up each time. The probability of now tossing a "head" on the 20th flip would then be:
If you did not know anything about standard deviation of population from which sample was taken, find out the 95% confidence interval for mean test score.
If sample of size 10 packages is randomly chosen, and 5 percent rate holds, determine the probability that exactly 2 packages in the sample arrive late?
Find out the probability that: First electric brush chosen is defective?
Suppose that sales of lemonade and sales of brownies are independent, determine standard deviation in his revenue.
Probability distribution described by the following density curve and The expected value of the sum of the weights of the two oranges, in pounds
Electronic baseball games manufactured by Tempco Electronics are shipped in lots of 25. Before shipping, a quality control inspector randomly selects a sample of 6 from each lot for testing. If sample contains any defective games, the entire lot i..
what is the required sample size is the error is to be less than 1/2 hour with a 95% level of confidence?
Find the test statistic value for testing the equality of population means of the two samples.
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