Question

In a study on air pollution carried out
by an experimental station, we obtained the following amounts of soluble benzene, suspended in
organic in micrograms per m3
, in different samples
of air:
2.28, 1.9, 3.32, 2.68, 2.57, 2.57, 0.928, 1.22
Assuming that the sampled population is approximately normal, construct a confidence interval at the level
90% for the corresponding real average.

Answer 1

Answer---->>

Here Critical value calculate from t-distribution table.

Alpha= 1- confidence level = 1- 0.90 = 0.1 (level of significance)