What do the variance, S.E., or standard deviation estimates tell you about your population that the mean does not? Why is it important to report some measure of variation, along with the sample size, whenever you report a calculated mean?Explain

Ecology Research Project Description Develop a plan on how to sample variation in a single trait of the plant species of your choice. Consider traits that may influence how well the species functions. Examples might include height, leaf length or number, flower length, fish length, invertebrate weight, etc. Your sample size should contain a minimum […]

Select a level of significance for testing whether the two suppliers have rivets with equal mean diameters. Discuss the factors you used to arrive at the level of significance you have selected.

Case 10.1: Motive Power Company-Part 1 – Further Instructions and Guidance Required Tasks: Cregg Hart is manufacturing manager for Larabee Engineering, a locomotive engine and rail car manufacturer. The company has been very successful in recent years, and in July 2016 signed two major contracts totaling nearly $200 million. A key to the company’s success […]

What does statistical significance mean? How do you know if something is statistically significant? What is the difference between statistical significance and practical significance?

Complete Parts A, B, and C below. Part A Why is a z score a standard score? Why can standard scores be used to compare scores from different distributions? Why is it useful to compare different distributions? For the following set of scores, fill in the cells. The mean is 74.13 and the standard deviation […]

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