Chapter A1, Problem A1.15QAP

Interpretation Introduction

(a)

Interpretation:

The value standard deviation during the determination of carbon monoxide in automotive exhaust gas is 0.030ppm on the basis of extensive past experience. The 90% confidence interval for triplicate analysis is to be determined.

Concept introduction:

The formula that will be used-

$CI,\mu =\overline{x}\pm \frac{ts}{\sqrt{N}}$

Here,

N = degree of freedom

$\mu$ = confidence interval

$\overline{x}$ = mean

s = standard deviation

t = constant

Interpretation Introduction

(b)

Interpretation:

The value standard deviation during the determination of carbon monoxide in automotive exhaust gas is 0.030ppm on the basis of extensive past experience. The number of measurement is to be determined when 90% confidence interval is to be 0.50ppm.

Concept introduction:

The formula that will be used-

$CI,\mu =\overline{x}\pm \frac{ts}{\sqrt{N}}$

Here,

N = degree of freedom

$\mu$ = confidence interval

$\overline{x}$ = mean

s = standard deviation

t = constant