Answered: a) Is the data normally distributed?…

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter1: Fundamental Concepts Of Algebra

Section: Chapter Questions

Problem 78RE

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Question

The data shown below are the red cell folate level (ug/l) in three groups.

a) Is the data normally distributed? Provide reasons for your answer. (solve using Kruskal Wallis formula)
b) Determine if the three groups of red cell folate level are the same? Hence, write a summary of what the result show.

Group 1
(n=8)
Group 2
(n=9)
group 3
(n=5)
243
206
241
251
210
258
275
226
270
291
249
293
347
255
328
354
273
380
285
392
295
309

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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