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Suppose that you take a random sample of 10,000 Americans and find that 1,111 are left- handed. You perform a test of significance to assess whether the sample data provide evidence that more than 10% of all Americans are left-handed, and you calculate a test statistic of 3.70 and a p-value of .0001. Furthermore, you calculate a 99% confidence interval for the proportion of left-handers in America to be (.103,.119).
Consider the following statements: The sample provides strong evidence that more than 10% of all Americans are left-handed. The sample provides evidence that the proportion of left-handers in America is much larger than 10%. Which of these two statements is the more appropriate conclusion to draw? Explain your answer based on the results of the significance test and confidence interval.
A normal population has a mean of 60 and a standard deviation of 3. You select a sample of 36. Compute the probability the sample mean is (Round z values to 2 decimal places and final answers to 4 decimal places):
Sarah is a 60 year old Anglo female in reasonably good health. She wants to take out a $50,000 term life insurance policy until she is 65.
Make use of normal probability distribution features of EXCEL to help determine the probability.
Describe and perform the five-step hypothesis test process: set up the hypothesis, select a level of significance, establish the decision rule, calculate the test statistic, and draw conclusion.
Let X be N( µ, 100). To test H0 : µ = 80 against H1 : µ > 80, let the critical region be defined by C = {(x1 , x2 , • • • , x25 ) : x > 83}, where x is the sample mean of a random sample of size n = 25 from this distribution.
Assume that a random sample of 40 mechanics is selected and the mean rebuild time of the sample is computed. Assuming the mean times are normally distributed, what percentage of sample means are greater than 7.7 hours?
suppose the historical average work week was 39.2 hours and sd was 4.8 hours as reported by the department of labor.
Three different methods for assembling a product were proposed by an industrial engineer. To investigate the number of units assembled correctly with each method
Assuming everyone I ask says East, how does the probability change with the sample size? In other words, how is the probability different if 50 out 50 women say East instead of 5 out of 5 women?
Create a research question for which the appropriate test of the statistical hypothesis would require the use of a z-score.
The Crusades: What were the causes and some of the consequences of the Crusading movement? Consider the roles and the motivations of the Byzantine Emperor, Pope Urban II, European monarchs and the individuals
Create an operations plan for your NAB company using the template in the text as a guide (p. 214 |Operations Plan Preparation Form ). Extract appropriate information from the NAB Company portfolio, where applicable. Other required items in the tem..
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