Question

6, The quality of mattresses manufactured by ABX are classified as superior, good, average and inferior by the Production and Quality Control department. Past performance of the plant shows that 70% of the production is classified as superior, 15% as good, 10% as average and 5% as inferior. As a check on last month's run of the plant 840 mattresses were randomly selected and after careful examination yielded the following classification QUALITY FREQUENCY Superior 600 Good 160 Average 70 Inferior 10 Test the hypothesis that there was no change in the quality of production last month. Let $\alpha$=0.05.

          6, The quality of mattresses manufactured by ABX are classified as superior, good,
average and inferior by the Production and Quality Control department. Past
performance of the plant shows that 70% of the production is classified as superior, 15%
as good, 10% as average and 5% as inferior. As a check on last month's run of the plant
840 mattresses were randomly selected and after careful examination yielded the
following classification
QUALITY
FREQUENCY
Superior
600
Good
160
Average
70
Inferior
10
Test the hypothesis that there was no change in the quality of production last month. Let
$\alpha$=0.05.

6, The quality of mattresses manufactured by ABX are classified as superior, good,
average and inferior by the Production and Quality Control department. Past
performance of the plant shows that 70% of the production is classified as superior, 15%
as good, 10% as average and 5% as inferior. As a check on last month's run of the plant
840 mattresses were randomly selected and after careful examination yielded the
following classification
QUALITY
FREQUENCY
Superior
600
Good
160
Average
70
Inferior
10
Test the hypothesis that there was no change in the quality of production last month. Let
α=0.05.

Added by Katherine H.

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