The mean age of employees in a production company is 37.6 years. The company is concern that the true mean is actually larger than this. A sample of 45 employees was selected, and the average age of this sample was 35 years. Which one will be the test hypotheses for this case?

	a.
	b.
	c.
	d.

In what sampling method does the researcher determine the sampling interval, select a random starting point between 1 and k, and then select every kth element?

	a.	Stratified random sampling
	b.	Systematic random sampling
	c.	Cluster sampling
	d.	Convenience sampling