A PC Company Uses Two Suppliers for Rechargeable Batteries for Its

question 22

Essay

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 ₁ = 67.25 min 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 mean use time? Test using a 0.10 level of significance.

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Definitions:

Normal Good

A good for which demand increases when consumer income rises, and decreases when consumer income falls.

Inferior Good

A type of good whose demand decreases when consumer income rises, contrary to normal goods, which see increased demand as incomes rise.

Inferior Good

A type of good whose demand decreases when the income of consumers increases.

Normal Good

An item whose demand escalates as the income of consumers increases, and contracts when their income decreases.