A7. The analyst in the Dorben Company made 10 independent time studies in the hand paint-spraying section of the finishing department. The product line under study revealed a directrelation between spraying time and product surface area. The following data were collected.Study No.1234568910Surface Area17012150411305070 10595(sq. inches)StandardTime (hours)0.32 0.11 0.31 0.140.270.1871200.240.23 0.25(7a) Compute the slope and intercept constant using regression line equations.(7b) What is the correlation coefficient?(7c) How much spray time would you allow for a new part with a surface area of 250 sq.inches?0.22

The question is about regression Given : To find : a ) Slope and intercept b ) Correl.…

Answered: 7. The analyst in the Dorben Company…

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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1. The following data was used to determine the concentration of arsenic in a river using atomic absorption spectrometry. Three replicate measurements were recorded for each sample and the absorbance values below are the averages. Conc. As (ppb) Abs. 2.5 0.0297 5.0 0.0588 7.5 0.0782 10.0 0.1039 Unknown 0.0615 a. Graph the data and determine the slope and and intercept. Use Excel-possibly the LINEST function- to determine the standard error about the regression. This is the uncertainty in the absorbance. b. C. d. e. Calculate the concentration of the arsenic in ppb. Do not worry about rounding to the correct number of significant figures until part e of this question. Determine the absolute uncertainty (i.e., standard devation) of the arsenic concentration for the unknown. Write the As concentration and its standard deviation to the correct number of significant figures.

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