Question

Lab 1 BASIC DATA PROCESSING PRE-LAB ASSIGNMENT 1. Read the lab manual carefully so you know what you have to do when you walk into the lab. 2. In a lab, the resistance of a resistor was measured using 50 samples giving the following values: 119.95 (6), 121.32 (5), 119.57 (7), 117.43(1), 120.76 (15), 120.67 (1), 119.78 (8), 121.43(3), 121.82(1), and 118.47 (3) 2 Estimate the average value of the resistance a. Estimate the standard deviation b C. Find the lower and the upper limits of the resistance values covering 99.7 % of the observations d. Obtain the z-score for a measurement of 120.47 Obtain the value of a measurement for a z-score of -1.95. e. Use Excel or matlab to verify your answers. 3. Run the following Matlab code to find the mean, median, standard deviation and histogram of the data. % Generate sample time measurement data clear all; close all datal -.1randn((100 1)+2.15 data2 3*randn(f100 1)+2.05 mean(datal) mean(data2) median(datal) median(data2) std(datal) std(data2) If your data values are measurements of a quantity that in principle should be the same for each different measurement, it is useful to plot a histogram of the values to get a sense of the average, the spread, and the shape of the distribution. Use the following commands and plot the histograms. Attach you code and results. hist(datal,20) hist(data2,20)

please I need help with excel or matlab part. part 3

Answer 1

%% matlab code

clc
clear all

data1 = 0.1*randn([100 1])+2.15;
data2 = 0.3*randn([100 1]) + 2.05;

mean(data1)
mean(data2)

median(data1)
median(data2)

std(data1)
std(data2)

hist(data1,20)

figure
hist(data2,20)

%% Each time you run the code, you will get different results

MATLAB R2013a S X - Search Documentation HOME PLOTS E 5 CE ES X + New La Find Files & Compare O Preferences Set Path ? Help G Community Request Support + Add-Ons Analyze Code Run and Time Clear Commands CODE New Script Open APPS New Variable Open Variable Import Save Data Workspace Clear Workspace VARIABLE Pratik Priyadarshi ► Documents ► MATLAB Command Window ans = Layout Simulink Library Q Parallel FILE SIMULINK ENVIRONMENT RESOURCES 2.1499 a l C: Users Current Folder Name E slprj untitled_grt_rtw - Thuj.png Animation OfBouncingBall.m ApproxZero.m Arctan Theta.m AvgRms.m BallBearingQuench.m Ball Trajectory.m BinToDec.m BisectionMethod.m CasinaSuraina.m Details ans = 2.0524 ans 2.1547 Command History clear all datal = 0.1*randn([100 1])+2 data2 = 0.3*randn ([100 1]) + mean (datal) "mean (data2) median (datal) "median (data2) std (datal) std (data2) hist (datal, 20) figure hist (data2, 20) clc **** clear all datal = 0.1*randn ([100 1])+2 data2 = 0.3*randn ([100 1]) + "mean (datal) mean (data2) "median (datal) median (data2) **** Std (datal) *** std (data2) hist (datal, 20) figure "hist (data2, 20) Workspace ans = Name Hans H data1 Hdata2 Value 0.3430 <100x1 double> <100x 1 double> 2.0739 ans 0.0918 ans = 0.3430

19 2.1 22 2.3 2.4 25

10 1.5 2.5 3.5