You would like to look at the mean number of hours worked for wages per week by students. Last year the mean hours worked per week was 15 hours. You would like to see if that has increased so you take a random sample of 100 students and ask them how many hours they worked last week. What is the correct statistical procedure?

Group of answer choices

One mean, sigma known.

One mean, sigma unknown.

The mean of differences, using dependent samples (paired data).

The difference of means, using independent samples.

ANOVA