At a research facility that designs rocket engines, researchers know that some engines fail to ignite as a result of fuel system error. From a random sample of 40 engines of one design, 14 failed to ignite as a result of fuel system error. From a random sample of 30 engines of a second design, 9 failed to ignite as a result of fuel system error. The researchers want to estimate the difference in the proportion of engine failures for the two designs. Which of the following is the most appropriate method to create the estimate? A one-sample zz-interval for a sample proportion A A one-sample zz-interval for a population proportion B A two-sample zz-interval for a population proportion C A two-sample zz-interval for a difference in sample proportions D A two-sample zz-interval for a difference in population proportions
At a research facility that designs rocket engines, researchers know that some engines fail to ignite as a result of fuel system error. From a random sample of 40 engines of one design, 14 failed to ignite as a result of fuel system error. From a random sample of 30 engines of a second design, 9 failed to ignite as a result of fuel system error. The researchers want to estimate the difference in the proportion of engine failures for the two designs. Which of the following is the most appropriate method to create the estimate?
-
A one-sample zz-interval for a sample proportion
A -
A one-sample zz-interval for a population proportion
B -
A two-sample zz-interval for a population proportion
C -
A two-sample zz-interval for a difference in sample proportions
D -
A two-sample zz-interval for a difference in population proportions
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