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MMLU / The mean thrust of a certain model jet engine is 9500 pounds. Concerned that a…

Problem

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question

The mean thrust of a certain model jet engine is 9500 pounds. Concerned that a production process change might have lowered the thrust, an inspector tests a sample of units, calculating a mean of 9350 pounds with a z-score of -2.46 and a P-value of 0.0069. Which of the following is the most reasonable conclusion?

choices

  1. 99.31% of the engines produced under the new process will have a thrust under 9350 pounds.
  2. 99.31% of the engines produced under the new process will have a thrust under 9500 pounds.
  3. 0.69% of the time an engine produced under the new process will have a thrust over 9500 pounds.
  4. There is evidence to conclude that the new process is producing engines with a mean thrust under 9500 pounds.

subject

high_school_statistics

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Source and history

task_id
cfe340ec-9e99-501e-9472-e4447660d057
task_key
all--test--cfe340ec-9e99-501e-9472-e4447660d057
task_revision_id
1
config / split
all / test

Official source

initial import