Question

Reserve Problems Chapter 6 Section 1 Problem 7 In an attempt to measure the effects of acid rain, researchers measured the pH (7 is neutral and values below 7 are acidic) of water collected from man in Ingham County, Michigan 4.59 5.37 5.38 4.63 3.87 4.74 3.71 4.96 4.64 4.36 4.52 5.39 4.16 5.62 4.57 4.90 5.48 4.57 4.57 4.51 4.19 4.56 4.61 4.32 3.98 3.71 4.15 3.98 5.65 3.10 5.04 4.62 3.62 4.34 4.16 4.54 5.12 3.71 3.39 5.59 Find the sample mean and sample tandard deviation of these measurements Round your answers to two decimal places (eg. 98.76). Click If you would like to Show Work for this question: Open Show Work tudy LINK TO TOET

Answer 1

From the given data

The sample mean xbar = $\sum$ Xi /n

xbar = 181.02/40

Xbar = 4.53

s = sample standard deviation

s = sqrt( $\sum$ ( X - Xbar )²/ n -1 )

$\sum$( X - Xbar)² = 15.5414

s = sqrt( 15.5414/39)

s = 0.63