A certain researcher is interested in determining whether fourth grade boys are on average taller than fourth grade girls. To gather evidence, the researcher divides the class into boy and girls and randomly selects 10 students from each group. This sampling technique is known as:

In a 1927-32 Western Electric Company study on the effect of lighting on worker productivity, productivity increased with each increase in lighting but then also increased with every decrease in lighting. If is is assumed that the workers knew a study was in progress, this is an example of:

The five-number summary for scores on a Statistics exam is 11, 59, 75, 79, 93. In all, 80 students took the test. About how many students had scores between 11 and 79?

Based on the graph above, in how many of the games played did the soccer team score goals equal to the median number of goals for the 29 games?

A certain researcher is interested in determining the average age of fans entering a baseball park. In order to not hold up the entrance line, the researcher decides to only ask the age of every 50th person passing through the turnstile. This sampling technique is known as:

In drawing a histogram, which of the following suggestions should be followed?

A sample of student opinions at a Big Ten University was obtained by first dividing all students into one of the 200 possible majors, and then doing a SRS (Simple Random Sample) of the majors to select only 10 majors. Once the 10 majors were selected, every student in these 10 majors was selected to be part of the study. This kind of sample is called a:

Which of the following techniques yields a simple random sample?  

A sociologist is conducting research on college students’ romantic relationships. They interview couples together and ask questions related to their level of satisfaction in the relationship. One participant, Karen, is actually quite unhappy in her relationship, but because her significant other is in the room with her, she lies and tells the researcher that she is happy. If Karen is not being honest in her response, what type of bias is present?

The five-number summary for scores on a Statistics exam is 11, 59, 75, 79, 93. In all, 80 students took the test. About how many students had scores between 59 and 79?