Kevin W.

# confused Stat

Question 7 (1 point)
Suppose a car dealership offers a low interest rate and a longer payoff period to customers or a high interest rate and a shorter payoff period to customers, and most customers choose the low interest rate and longer payoff period.

Does that mean that most customers want a lower interest rate?

Question 7 options:
YES:  Regardless of payoff period length, customers want the lower interest rate.

NO:  Because interest rate and payoff period length are both variables, we cannot conclude that customers want the lower interest rate regardless of length of payoff period.

#3

You wish to determine the GPA of students at your school. Select the correct sequence of process steps you would go through to collect a sample if you use a stratified sample:
Obtain a list of all students at the school from the registrar's office.
Separate the students into different groups by major.
Use a random number generator to randomly choose the students you want to have in your sample from each major and record their GPA.
Assign each student a number.
Use a random number generator to randomly choose certain majors and then record the GPA from all students in the chosen majors.
Divide the students based on their major.
Randomly choose a number as the starting point, then count from the beginning of the list to the starting point.  Then choose every 50th student from this starting point and record their GPA.

Question 3 options:
A)
1 - 7

B)
1 - 4 - 6 - 5

C)
1 - 4 - 2 - 3

D)
1 - 3 - 4 - 2

#4
To evaluate whether a new fertilizer improves plant growth more than the old fertilizer, the fertilizer developer gives some plants the new fertilizer and others the old fertilizer. Is this an observation or an experiment?  Why?  Select the most correct answer:

Question 4 options:
A)
Observation:  you are only watching how the plants grow and develop.

B)
Experiment:  you imposed a treatment (new fertilizer on some plants, old on others) to determine its effect.

C)
Observation:  you already know which plants are treated with the new fertilizer and which are treated with the old fertilizer; you're only collecting data from both groups

D)
Experiment:  you are only watching how the plants grow and develop