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Given the following hypothesis:
Ho:µ=400H1:µ>400
For a random sample of 12 observations, the sample mean was 407 and the sample standard deviation 6. Using the .01 significance level:
A: State the decision rule.
B: Compute the value of the test statistic.
C: What is your decision regarding the null hypothesis?
At the .05 significance level, can we conclude that the guideline is still reasonable?
Use the list of random digits below to assign 4 men and 2 women to the shark fin treatment. Read the table from left to right, first selecting the 4 men and then the 2 women. Use the numerical labels given in the chart to the names.
The average number of miles that 90 truckers drove in a day was 540.0 with a standard deviation of 40 miles. What is the 99% confidence interval of the true mean number of miles driven by all truckers?
A sample from a population with μ = 40 and =σ10 has a mean of m = 44. if the sample mean corresponds to a z = 2.00, then how many scores are in the sample?
Use a 0.05 significance level to test the claim that this sample comes from a population with a married percentage of less than 58.6%.
Allen Abbott has a wide-curving, uphill driveway leading to his garage. When ther is a heavy snow, Allen hires a local carpenter, who shovels snow on the side in teh winter, to shovel his driveway.
The average monthly gasoline purchase for a family with 2 cars is 90 gallons. This statistic has a normal distribution with a standard deviation of 10 gallons. A family is chosen at random.
In order that the sample proportion and the population proportion not differ by more than 0.05 with 95% level of confidence, what sample size should be used?
Suppose you want to sell your house and you have decided to accept the first offer exceeding M dollars, say. Assume that the offers are i.i.d. with common distribution F. Find the expected number of offers received before selling the house.
Find out the decision strategy company must follow, expected value of strategy, and maximum amount the company must pay market research firm for survey results.
Make a List of type of possible errors. Assume that you were interested in knowing the mean score for a certain quiz in a statistics class.
Construct a 95% confidence interval estimate for the population proportion of administrative professionals who prefer cash bonuses.
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