Four brands of lightbulbs are being considered for use in the final assembly are

Question

Four brands of lightbulbs are being considered for use in the final assembly area of the Ford F-150 truck plant in Dearborn, Michigan. The director of purchasing asked for samples of 200 from each manufacturer. The numbers of acceptable and unacceptable bulbs from each manufacturer are shown below. At the 0.01 significance level, is there a difference in the quality of the bulbs? (Round your answers to 3 decimal places.)

Four brands of lightbulbs are being considered for use in the final assembly area of the Ford F-150 truck plant in Dearborn, Michigan. The director of purchasing asked for samples of 200 from each manufacturer. The numbers of acceptable and unacceptable bulbs from each manufacturer are shown below. At the 0.01 significance level, is there a difference in the quality of the bulbs? (Round your answers to 3 decimal places.)

Explanation / Answer

The statistical software output for this problem is:

Contingency table results:
Rows: var1
Columns: None

Chi-Square test:

Hence,

Reject Ho if X2 > 11.345

X2 = 11.404

Reject Ho.

A B C D Total Unacceptable 42 35 27 19 123 Acceptable 158 165 173 181 677 Total 200 200 200 200 800

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