Statistics Assignment work:Task 3: The means of two samples of sizes50 and 100 respectively are 54-1 and 50-3and the Mandard deviations are 8 and 7.Obtain the standard deviation of the sampleof size 150 obtained by combining the twOsamples.

Answered: Image /qna-images/answer/27a4743c-75df-4494-8f50-064de1a7ce10.jpg

Answered: Task 3: The means of two samples of…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Jeff is doing an experiment involving mice. The mice weights have mean weight 2.37 ounces and standard deviation 0.053 ounces. Jeff selects 9 mice independently and calculates the sample mean, x̄, of their weights. What is the standard deviation of x̄?
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A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1458 and the standard deviation was 312. The test scores of four students selected at random are 1860, 1220, 2150, and 1340. Find the z-scores that correspond to each value and determine whether any of the values are unusual. The z-score for 1860 is (Round to two decimal plaes as needed.)
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Task 3: The means of two samples of sizes 50 and 100 respectively are 54-1 and 50-3 and the Mandard deviations are 8 and 7. Obtain the standard deviation of the sample of size 150 obtained by combining the twO samples.