D Question 16 1 pts Since the sample variance is 17.4 and that is higher than 15 (which is the maximum allowed), can the manufacturer conclude that the population variance is too high? No. This sample had a variance of 17.4, but that may have been due to random variation. They must perform a hypothesis test to confirm whether the variance is too high in the population. No. If the sample variance is higher than 15, that means the population variance is lower than 15. Yes. 17.44 is clearly higher than 15, so the manufacturer should take steps to bring this variance under control. D Question 17 1 pts What are the correct hypotheses to use in this test? O Ho: 02 215 HA : 02 02 2 O Ho: H S 15 HA: M > 15 O Ho: 02 5 15 HA : 02 > 15 O Ho : 02 5 17.4 HA: 02 > 17.4D Question 15 1 pts For questions 15 through 21, refer to the following: A manufacturer has been implementing a just-in-time inventory system for its production line. The final product requires a hinge to be installed at a particular station on the assembly line. Ideally, the next hinge would arrive at the station just when the operator needed it. However, due to various factors, some buildup of hinges at the station is to be expected. Of concern is the variance of the inventory of hinges. The company wants to ensure that the variance is no more than 15. If the variance exceeds 15, then adjustments must be made to bring it under control. On a given day, an analyst at the company records the inventory of hinges at 20 randomly selected times. The variance of the sample is found to be 17.4. Conduct a hypothesis test at the a = 0.05 significance level to find out if the population variance of hinges is more than 15. What is n? O 20 O 0.05 O 15 O 17.4 D Question 16 1 ptsD Question 20 1 pts What is your conclusion? Do not reject Ho. Accept HA. O Reject Ho and accept HA O Reject Ho. HA is unsupported. Do not reject Ho. HA is unsupported. D Question 21 1 pts Which is the correct interpretation, at the a = 0.05 significance level? The manufacturer cannot conclude that the population variance of the number of hinges is more than 15. No adjustments should be made at this time. The manufacturer can conclude that the population variance of the number of hinges is less than or equal to 15. No adjustments should be made at this time. The manufacturer can conclude that the population variance of the number of hinges is greater than 15. Adjustments should be made to bring the variance under control.D Question 18 1 pts What is the value of the Chi-Square test statistic? Report this value to 3 decimal places , even if the last decimal place is a zero D Question 19 1 pts What is the correct Critical Value to use in this case? Remember a = 0.05. O 8.907 30.144 10.117 34.170 31.410 D Question 20 1 pts