Free answers to statistics problems
[DOC File]Z-Score Practice Worksheet
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A normal distribution of scores has a standard deviation of 10. Find the z-scores corresponding to each of the following values: A score that is 20 points above the mean.
[DOC File]Statistics Linear Regression Worksheet
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1. The decline of salmon fisheries along the Columbia River in Oregon has caused great concern among commercial and recreational fishermen. The paper “Feeding of Predaceous Fishes on Out-Migrating Juvenile Salmonids” gave the accompanying data on y = maximum size of salmonids consumed by a northern squaw fish and x = squawfish length, both in millimeters.
[DOCX File]Purdue University - Department of Statistics
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STAT 113 Week 2 (Jan 14). Work Sheet 1: Chapter 1-3. Observatio. nal . S. tudy or . E. xperiment? Which of the following is an observational study and which is an experiment?
[DOCX File]Descriptive Statistics Practice Exercises
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Descriptive Statistics Practice Exercises. Work these exercises without using a computer. Do use your calculator. At the end of the document you fill find the answers. If you need more practice, please work the exercises at the end of the chapters in Howell. Exercise 1.
[DOCX File]Purdue University - Department of Statistics
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When we use confidence intervals we need a simple random sample and the data must be collected correctly. Here we only have a voluntary response sample which might be biased, therefore the result cannot be applied to all seventh-grade girls in that Midwest school district.
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