Of 346 items tested, 12 are found to be defective. Construct the 98% confidence interval for the proportion of all such items that are defective.
How do you convert the numbers to equate like this: 0.0345<p<0.0349
A survey of 300 union members in New York reveals that 112 favor the Republican candidate for governor. Construct the 98% confidence interval for the true population proportion of all New York State union members who favor the Republican candidate.
Two teams of workers assemble automobile engines at a manufacturing plant in Michigan. Quality control personnel inspect a random sample of the teams assemblies and judge each assembly to be acceptable or unacceptable. A random sample of 127 assemblies from team 1 shows 12 unacceptable assemblies. A similar random sample of 98 assemblies from team 2 shows 5 unacceptable assemblies.
a. Construct a 90% confidence interval for the difference between the portions of unacceptable assemblies generated by the two teams.
b. Based on a review of the confidence interval found in part a, is there sufficient evidence to conclude, at the 10% significance level, that the two teams differ with respect to their portions of unacceptable assemblies. Conduct a hypothesis test to prove this theorem.
c. For which values of the differences between these two sample portions could you conclude that a statistically significant difference exists? (at ? = .10 level)
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