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Statistics: Difference in quality of lightbulbs

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Four brands of lightbulbs are being considered for use in the final assembly area of the Saturn plant in Spring Hill, Tennessee. The director of purchasing asked for samples of 100 from each manufacturer. The numbers of acceptable and unacceptable bulbs from each manufacturer are shown below. At the .05 significance level, is there a difference in the quality of the bulbs?

Manufacturer
A
B
C
D

Unacceptable
12
8
5
11

Acceptable
88
92
95
89

Total
100
100
100
100

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