A Producer of Various Kinds of Batteries Has Been Producing

question 83

Essay

A producer of various kinds of batteries has been producing "D" size batteries with a life expectancy of 87 hours. Due to an improved production process, management believes that there has been an increase in the life expectancy of their "D" size batteries. A sample of 36 batteries showed an average life of 88.5 hours. Assume from past information that it is known that the standard deviation of the population is 9 hours.
a.Give the null and the alternative hypotheses.
b.Compute the test statistic.
c.At 99% confidence using the critical value approach, test management's belief.
d.What is the p-value associated with the sample results? What is your conclusion based on the p-value?

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Definitions:

Freight-in

The cost of shipping goods to the buyer's location, which is often included in the inventory cost.

Supplies Expense

The cost associated with the consumption of supplies utilized during an accounting period in the operation of a business.

Sales Discounts

A reduction in the price of a product or service provided by the seller to the buyer, often used as an incentive to encourage prompt payment or to increase sales volume.

Net Sales

The revenue from sales transactions after deductions of returns, allowances for damaged or missing goods, and discounts.