Company representatives claim that they will ship a product in less than four days

Population mean is .

Here claim is .

This is the claim of alternative type of hypothesis since it includes an inequality symbol.

The complement is .

Hypothesis are (Claim) and .

Find the critical values and region.

Sample mean is .

60 delivery times has randomly selected.

Here , Use normal distribution.

Critical region is depends on sign of the alternative hypothesis.

Therefore the test is left tailed since .

Standard deviation and  significance is called for .

By using the graphing calculator find the value.

Using calculator .

Critical region is .

Calculate the test statistic.

Find statistic value.

The value of

The value of .

Substitute  and .

.

Substitute and and in .

Reject or fail to reject the null hypothesis.

is rejected since test statistic fall with in the critical region.

Therefore, there is an evidence to reject the claim of .

The value of .

There is an evidence to reject the claim of .