A pipes manufacturer makes pipes with a length that is supposed to be 16 inches. A quality control technician sampled 30 pipes and found that the sample mean length was 16.09 inches and the sample standard deviation was 0.25 inches. The technician claims that the mean pipe length is not 16 inches. What type of hypothesis test should be performed? Select Select What is the test statistic? Ex: 0.123 Left-tailed t-test What is the number of degrees of freedom? Ex: 20 Right-tailed t-test Left-tailed z-test Does sufficient evidence exist at the a = 0.1 signif technician's claim? Select v rt the %3D Two-tailed t-test

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.