What hypothesis testing procedure should you use to answer these questions? Assume all samples are simple random samples, and assume x = 0.05 if it isn't specified. A manufacturing company claims that 90% of items produced by a certain process are nondefective. An improvement in the process is being considered that they feel will raise the proportion of nondefectives above the current 90%, but costs a considerable amount. A sample of 121 items are produced with the new process and 7 are defective. Is this evidence sufficient (at x = 0.05) to conclude that the method has been improved? One sample z-test for the population mean. Two sample z-test for the population means. One sample z-test for proportions. Two sample z-test for proportions. One sample t-test for the population mean. None of our hypothesis tests fit.
What hypothesis testing procedure should you use to answer these questions? Assume all samples are simple random samples, and assume x = 0.05 if it isn't specified. A manufacturing company claims that 90% of items produced by a certain process are nondefective. An improvement in the process is being considered that they feel will raise the proportion of nondefectives above the current 90%, but costs a considerable amount. A sample of 121 items are produced with the new process and 7 are defective. Is this evidence sufficient (at x = 0.05) to conclude that the method has been improved? One sample z-test for the population mean. Two sample z-test for the population means. One sample z-test for proportions. Two sample z-test for proportions. One sample t-test for the population mean. None of our hypothesis tests fit.
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Author:Amos Gilat
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
Transcribed Image Text:What hypothesis testing procedure should you use to answer these questions?
Assume all samples are simple random samples, and assume x = 0.05 if it isn't
specified.
A manufacturing company claims that 90% of items produced by a certain process
are nondefective. An improvement in the process is being considered that they feel
will raise the proportion of nondefectives above the current 90%, but costs a
considerable amount. A sample of 121 items are produced with the new process and
7 are defective. Is this evidence sufficient (at x = 0.05) to conclude that the method
has been improved?
One sample z-test for the population mean.
Two sample z-test for the population means.
One sample z-test for proportions.
Two sample z-test for proportions.
One sample t-test for the population mean.
None of our hypothesis tests fit.
21
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