(a) A manufacturing company tested 30 printed circuit boards and the findings are as follows: Mean length of life for 30

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(a) A manufacturing company tested 30 printed circuit boards and the findings are as follows: Mean length of life for 30

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A A Manufacturing Company Tested 30 Printed Circuit Boards And The Findings Are As Follows Mean Length Of Life For 30 1
A A Manufacturing Company Tested 30 Printed Circuit Boards And The Findings Are As Follows Mean Length Of Life For 30 1 (28.19 KiB) Viewed 75 times
(a) A manufacturing company tested 30 printed circuit boards and the findings are as follows: Mean length of life for 30 boards = 3,266 hours. Standard deviation of life length in sample = 140 hours. Construct a 90% confidence interval for the mean length of life for the new printed circuit boards. 2.5 Marks (6) The average cost of a speeding ticket is approximately OMR 15. A random sample of 38 speeding ticket showed that the mean cost was OMR 16.249. At the 0.01 level of significance, is that greater than OMR 15? The population standard deviation is OMR 2.067. 2.5 Marks
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