Evidence that treatment decreases surface hardness

Reference no: EM13110545

In intaglio printing, design or figure is carved beneath surface of hard metal or stone. Business objective of intaglio printing company is to find out whether there are differences in mean surface hardness of steel plates, based on two different surface conditions - untreated and treated by lightly polishing with emery paper. Experiment is created in which 40 steel plates are arbitarily assigned - 20 plates are untreated and 20 plates are treated. Results of experiment are as follows:

Hardness
Untreated Treated
164.4 177.1 158.2 150.2
159.0 163.9 138.2 155.6
153.9 167.8 168.0 151.2
165.1 160.8 149.7 158.7
157.2 167.4 145.5 151.2
154.5 163.5 168.2 150.9
160.9 164.5 154.3 161.7
164.9 171.2 162.8 157.0
169.1 175.0 161.0 156.7
175.3 166.3 167.7 147.9

Suppose that population variances from both conditions are equal is there evidence that treatment decreases surface hardness of steel plates? Solve manually. Use alpha = 0.05) Point to your decision rule, hypotheses and statistical and management conclusions.

Reference no: EM13110545

Questions Cloud

Illustrate what gain or loss is recognized by corporation : Illustrate what gain or loss is recognized by the corporation when it issues its shares to Kyle? Illustrate what is the basis to the corporation of the property it received from Kyle?

Statistics problems and hypothesis testing : A political action committee decided to poll its membership to determine if they were in favor of a certain potential law, similar to gun control.

What is the order of genes on the chromosome : A cross in corn is carried out with three linked genes in a triply heterozygous genotype for the alleles pairs (A, a), (D, d), and (R, r). The dominant allele A results in red leaves; aa plants have green leaves.

Illustrate what is relationship between deductive arguments : Illustrate what is the relationship between deductive and inductive arguments? Explain why are both types valuable in research? Provide examples of each type, illustrating benefits of their usage.

Evidence that treatment decreases surface hardness : Suppose that population variances from both conditions are equal is there evidence that treatment decreases surface hardness of steel plates?

What types of mutations have changed the pav : Assuming the PAV allele is the original one, what types of mutations (silent, missense, nonsense, etc.) have changed the PAV allele into the AVI allele? Explain. Based on the information given, how do these changes fit with what you have learned a..

What output should the firm produce in the short run : How many additional watches can be produced by an extra hr of labor? As a profit maximizer what price and output should the firm set? Is production capacity fully utilized? What contribution does this product line provide?

Discuss the future growth and nature of wholesaling : Discuss the future growth and nature of wholesaling if chains, scrambled merchandising and the internet continue to become more important.

Illustrate what entities exist as surrogate regulators : Illustrate what entities exist as surrogate regulators to influence environmental sustainability? Explain why or explain why not surrogate regulators are effective?

User Account

All Pages