Hypothesis Testing
Not what you're looking for?
Concrete blocks are to be used in the foundations of several buildings. The specifications state that the minimum arithmetic mean compressive strength of a sample of blocks must be 1,000 pounds per square inch (psi). If two companies submit samples of blocks that have mean compressive strengths over the minimum (1,000 psi), then the specifications state that one of two actions will be taken:
1) If a statistical test applied to the sampling results indicate that the samples could have come from the same, or identical, populations, the contract for the blocks will be divided equally.
2) If the sample statistics indicate that there are two populations involved, the company submitting the blocks having the higher compression will be awarded the contract. The companies involved are Stanblock and Hicompressive.
Stanblock Hicompressive
x bar = 1070 x bar = 1020
n = 81 n = 64
s = 63 s = 57
1) Following the usual five step hypothesis testing procedures, what would your decision be?
2) Why would performing this test be important?
Purchase this Solution
Solution Summary
The solution answers the question(s) below.
Purchase this Solution
Free BrainMass Quizzes
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.
Measures of Central Tendency
This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.
Know Your Statistical Concepts
Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.