To study the water PH level, two independent lakes were selected for sampling. In a duration ofone year, 12 samples (one in each month) are selected from each lake. The PH mean and standarddeviation of lake 1 sample were found to be 6.5 and 0.2, while the PH mean and standard deviationof lake 2 sample were found to be 7.2 and 0.1.(a) Find a 90% confidence interval for µ1 – µ2 (i.e., the difference between the population meansfor the two lakes) assuming that the populations are approximately normally distributed with equalvariances.(b) You decide to change the above significance level from 0.1 to 0.05. Everything else is keptsimilar to above. Explain how your calculated confidence interval will change, and why? (i.e., willit become wider or narrower). (No need to calculate the new confidence interval) (- :

We associate with the interval estimate is called a confidence interval. This probability indicates…

Answered: one year, 12 samples (one in each…

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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The data is presented in parallel format. Before running the ANOVA in Excel, you will need to put it into serial (column) format. You will need to create a categorical variable for the first factor (days) and for the second factor (time of day). This is a critical step.The data presented shows exam scores for students randomly assigned to the sections meeting on these days at these times of the day: Thursday Friday Morning Afternoon Morning Afternoon 70.878.15978.246.646.476.559.376.370 65.678.359.359.778.680.892.780.865.392.3 90.890.569.177.36977.558.677.877.558.6 63.372.854.254.472.166.26372.56672.2 Conduct a 2-way ANOVA. First, find the group means for each level of the factors. (Report answers accurate to 2 decimal places.)Days: MThursday=MThursday= MFriday=MFriday= Time of day: Mmorning=Mmorning= Mafternoon=Mafternoon= Report the results of the ANOVA for the main & interaction effects. (Report P-values accurate to 4 decimal places and…
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