Engineers at the Maxwell Products Company have designed a new metal bearing rod that is alleged to be extremely durable. To estimate the mean useful length of life, engineers test nine of these rods and find that the useful length of lif. (in hours) of each is as follows: 25,000 25, 280 25,300 25,200 25,400 25,250 25,600 25,014 25,350 "revious experience with similar such rods indicates that tho
Engineers at the Maxwell Products Company have designed a new metal bearing rod that is alleged to be extremely durable. To estimate the mean useful length of life, engineers test nine of these rods and find that the useful length of lif. (in hours) of each is as follows: 25,000 25, 280 25,300 25,200 25,400 25,250 25,600 25,014 25,350 "revious experience with similar such rods indicates that tho
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
Transcribed Image Text:4. Engineers at the Maxwell Products Company have designed a new metal bearin
rod that is alleged to be extremely durable. To estimate the mean useful length
of life, engineers test nine of these rods and find that the useful length of life
(in hours) of each is as follows:
25,200
25,400
25,250
Previous experience with similar such rods indicates that the useful length of
life of individual rods of this particular type is normally distributed. Construct
a 90% confidence interval for the mean useful length of life of all rods of this
25,000
25,280
25,300
25,600
25,014
25,350
new type.
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