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Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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5. A company selling light bulbs claims that the average life of its light bulbs is 20,000 hours. A client who thinks that the average life of the light bulbs is less than this, tested a random sample of 55 light bulbs. The test resulted to a sample mean of 19,975 hours and standard deviation of 100 hours. Is there sufficient evidence to conclude that average life of the company's light bulbs is less than 20,000 hours? Use 0.05 level of significance.
Transcribed Image Text:5. A company selling light bulbs claims that the average life of its light bulbs is 20,000 hours. A client who thinks that the average life of the light bulbs is less than this, tested a random sample of 55 light bulbs. The test resulted to a sample mean of 19,975 hours and standard deviation of 100 hours. Is there sufficient evidence to conclude that average life of the company's light bulbs is less than 20,000 hours? Use 0.05 level of significance.
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