ShmoopTube

Where Monty Python meets your 10th grade teacher.

Search Thousands of Shmoop Videos


AP Statistics Videos 40 videos

AP Statistics 2.1 Exploring Data
210 Views

AP Statistics 2.1 Exploring Data. How does this change affect the mean, standard deviation, and IQR?

AP Statistics 5.1 Exploring Data
37 Views

AP Statistics 5.1 Exploring Data. What does this information tell us about the data?

AP Statistics 5.2 Exploring Data
23 Views

AP Statistics 5.2 Exploring Data. Which method would not be a good option?

See All

AP Statistics 1.2 Sampling and Experimentation 267 Views


Share It!


Description:

AP Statistics: Sampling and Experimentation Drill 1, Problem 2. Which of the following studies would be the best approach to finding his new location?

Language:
English Language

Transcript

00:03

Here's your AP stats shmoop du jour:

00:06

Bill has decided to fulfill his lifelong dream and open an exotic yogurt store.

00:11

He has narrowed his possible future location to one of two large cities and would like to determine the

00:17

location with the most yogurt fanatics.

00:23

Which of the following studies would be the best approach to finding his new location?

00:28

And here are the possible answers...

00:35

Okay. We know, we know, before we even get to the real question, the more important question...

00:40

is it greek yogurt or frozen yogurt?

00:46

Let's just say it's frozen yogurt because everybody loves some froyo in town.

00:50

Back to the real question...The question asks us how Bill should measure the amount of yogurt

00:54

fanaticism by area. To do this, we'll want a survey that measures how much people like

00:59

yogurt in each of the two large cities.

01:05

Emphasis on the word SURVEY.

01:10

Since experiment E merely compares the how much people like exotic and standard yogurt by area

01:16

and is an experiment..not a survey,

01:22

we can rule out option (E) as an answer choice.

01:28

The question also mentions that we're dealing with two large cities...so doing any kind

01:33

of census where we poll every single person in the population...kind of like that government

01:38

population census they do every 10 years...

01:43

Too much money and time to do it...

01:45

Bill needs as much time as possible to perfect his new shnozberry yogurt recipe.

01:53

Therefore, we are left with three surveys: the mail-in survey, the grocery store survey,

01:59

and the phone survey, options A, C, and D.

02:02

Ok, the mail-in survey. First of all, if you

02:05

ever saw a survey in the newspaper...when have you ever actually filled it out and turned

02:10

it in? Besides...who reads newspapers anymore...

02:13

Honestly, the only people who will turn in the mail-in

02:15

survey are those feel really strongly..either positively or negatively..about establishing

02:21

a new yogurt store in the area.

02:27

Kind of like Bill.

02:30

This kind of bias is called self-selection bias.

02:32

The people being surveyed "self-select" themselves into the group that really cares

02:36

about froyo.

02:39

The local grocery store survey. Let's think about this. What if you just don't happen

02:44

to shop at that particular grocery store that Bill's handing out surveys?

02:50

Maybe you live too far, maybe you had a late night and couldn't get up to go with your parents to

02:54

the store...Regardless, the local grocery store surveys won't give Bill a random sample

02:59

of the city. It'll give him a sample of the people who happen to shop at the particular grocery store that day.

03:07

And finally, we're left with option D. The phone survey.

03:12

Oo, we like that word: random.

03:14

Random is usually a good indicator in stats that you're performing the right type of experiment

03:19

without sampling biases. The word stratified in this case

03:24

just means that Bill is first

03:26

dividing or stratifying the population into each of the two cities...and then choosing

03:31

random people to survey in each group. Answer's (D).

03:36

And since we like random things so much, we can't wait until Bill installs his new random

03:39

yogurt flavor-making machine. The machine will mix up to three random flavors chosen

03:44

from his exotic stock.

03:46

Watch out for the anchovy yogurt, people.

Related Videos

AP Statistics 2.1 Exploring Data
210 Views

AP Statistics 2.1 Exploring Data. How does this change affect the mean, standard deviation, and IQR?

AP Statistics 5.1 Exploring Data
37 Views

AP Statistics 5.1 Exploring Data. What does this information tell us about the data?

AP Statistics 5.2 Exploring Data
23 Views

AP Statistics 5.2 Exploring Data. Which method would not be a good option?

AP Statistics 1.5 Statistical Inference
206 Views

AP Statistics 1.5 Statistical Inference. Which of the following statements is false?

AP Statistics 2.1 Statistical Inference
27 Views

Want to pull an Oliver Twist and ask us for more? We've gotcha covered. Head over to /video/subjects/math/test-prep/ap-statistics/ for more AP...