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A PC Company Uses Two Suppliers for Rechargeable Batteries for Its

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A PC company uses two suppliers for rechargeable batteries for its notebook computers.Two factors are important quality features of the batteries: mean use time and variation.It is desirable that the mean use time be high and the variability be low.Recently,the PC maker conducted a test on batteries from the two suppliers.In the test,9 randomly selected batteries from Supplier 1 were tested and 12 randomly selected batteries from Supplier 2 were tested.The following results were observed:
Supplier 1 Supplier 2
n1 = 9 n2 = 12 A PC company uses two suppliers for rechargeable batteries for its notebook computers.Two factors are important quality features of the batteries: mean use time and variation.It is desirable that the mean use time be high and the variability be low.Recently,the PC maker conducted a test on batteries from the two suppliers.In the test,9 randomly selected batteries from Supplier 1 were tested and 12 randomly selected batteries from Supplier 2 were tested.The following results were observed: Supplier 1 Supplier 2 n<sub>1</sub> = 9 n<sub>2</sub> = 12 <sub>1</sub> = 67.25 min <sub>2</sub> = 72.4 min <sub> s</sub><sub>1</sub> = 11.2 min s<sub>2</sub> = 9.9 min Based on these sample results,can the PC maker conclude that a difference exists between the two batteries with respect to the population standard deviations? Test using a 0.10 level of significance. 1 = 67.25 min A PC company uses two suppliers for rechargeable batteries for its notebook computers.Two factors are important quality features of the batteries: mean use time and variation.It is desirable that the mean use time be high and the variability be low.Recently,the PC maker conducted a test on batteries from the two suppliers.In the test,9 randomly selected batteries from Supplier 1 were tested and 12 randomly selected batteries from Supplier 2 were tested.The following results were observed: Supplier 1 Supplier 2 n<sub>1</sub> = 9 n<sub>2</sub> = 12 <sub>1</sub> = 67.25 min <sub>2</sub> = 72.4 min <sub> s</sub><sub>1</sub> = 11.2 min s<sub>2</sub> = 9.9 min Based on these sample results,can the PC maker conclude that a difference exists between the two batteries with respect to the population standard deviations? Test using a 0.10 level of significance. 2 = 72.4 min
s1 = 11.2 min s2 = 9.9 min
Based on these sample results,can the PC maker conclude that a difference exists between the two batteries with respect to the population standard deviations? Test using a 0.10 level of significance.

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