Production managers on an assembly line must monitor the output to be sure that the level of defective products remains small. They periodically inspect a random sample of the items produced. If they find a significant increase in the proportion of items that must be rejected, they will halt the assembly process until the problem can be identified and repaired. Complete parts a through d below.

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Part 1

a) Write null and alternative hypotheses for this problem.

A.

H0:

The level of defective products has increased.

HA:

The level of defective products has decreased.

B.

H0:

The level of defective products has decreased.

HA:

The level of defective products has increased.

C.

H0:

The level of defective products remains the same.

HA:

The level of defective products has increased.

D.

H0:

The level of defective products remains the same.

HA:

The level of defective products has decreased.