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 100 from each manufacturer. The numbers of acceptable and unacceptable bulbs from each manufacturer are shown below. At the 0.10 significance level, is there a difference in the quality of the bulbs? (Round your answers to 3 decimal places.)

	Manufacturer
	A			B			C			D
Unacceptable		5			19			18			11
Acceptable		95			81			82			89
Total		100			100			100			100

H₀: There is no relationship between quality and manufacturer.
H₁: There is a relationship.

Reject H₀ if ² > _______ , ² = ________

(reject/accept) Ho. There is _________ evidence to indicate that there is a relationship between quality and manufacturer.

Answer 1

Reject H0 if chi square calculated is greater than chi square tabulated value.

As null hypothesis is rejected at 10% los, we conclude that the there is relationship between quality and manufacturers.

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