lesson_10.3.1_version_1.6_student

3 are the criteria for the approximate normality of

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Span of Batteries A company provides portable walkie ­talkie radios to construction crews. Their batteries last, on average, 55 hours. The purchasing manager receives a brochure advertising a new brand of batteries with a lower price, but suspects that the average battery life for this new battery is shorter than the brand they currently use. He wants to perform statistical test at the 1% level of significance to determine if the cheaper batteries have a shorter average lifespan. Step 1: Determine the Hypotheses 1 Give the null and alternative hypotheses for this test. 2 Is this a left ­tailed, right ­tailed, or two ­tailed test? Step 2: Collect the Data To test this, the manager installs 40 randomly selected batteries of the new brand in the same walkie ­talkie radios. He finds that the mean lifetime for the sample is 52...
View Full Document

This document was uploaded on 03/13/2014 for the course MATH 75 at Skyline College.

Ask a homework question - tutors are online