Stats Final Review

Stats Final Review

From Mrs. Blocker because she's amazing and she needs you to pass this exam

Multiple Choice

Describe the shape of this histogram

• Skewed right

• uniform

• Skewed left

• Symmetric

Remember!

To find the skew, look for the "tail"

Multiple Choice

What is the median number of brothers and sisters?

• 2

• 2.5

• 3

• 3.5

Remember!

To find the median, put the data in order from least to greatest, and then find the middle (if two numbers are in the middle, add them together and divide by 2)

Multiple Choice

Five people were eating different sizes of chicken for dinner. The weights of their entrees to the nearest whole ounce are: 4, 4, 5, 6, 8, 10. Find the mean chicken entrée

• 6.5

• 6

• 7

• 6.16

Remember!

When you find the mean, add all the numbers and divide by how many numbers you added. In this case you added 6 numbers which equaled 37, so 37 divided by 6

Multiple Choice

A weight loss group have entered their initial data. Weights of the members are: 137, 162, 212, 243, 301. What is the range of weight of the participants?

• 212

• 211

• 164

• 150

Remember!

To find the range, you take the highest value and subtract the lowest

Multiple Choice

What is the lowest income on the stem plot?

• $180

• $1,180

• $1.80

• 180,000

Remember!

Look at the key on the stem plot!

Multiple Choice

What is the relationship between paychecks and weeks on the scatter plot?

• negative correlation

• no relationship

• positive correlation

• equal

Multiple Choice

Some data were collected on the weight of a male white laboratory rat for the first 25 weeks after its birth. A scatterplot of x = time since birth (in weeks) and y = weight (in grams) shows a fairly strong, positive linear relationship.

The regression equation y=100+40x models the data fairly well.

Interpret the slope of the regression line.

• The weight of a male white lab rat increases 100 grams every 40 weeks

• The weight of a male white lab rat increases 1 gram every 40 weeks

• The weight of a male white lab rat increases 40 grams every 100 weeks

• The weight of a male white lab rat increases 1 gram every 100 weeks

Multiple Choice

Which of the following is NOT a statistical question?

• How many students have As in this class?

• How old is Mrs. Blocker?

• What is the average age of teachers in our school?

• What proportion of seniors drive trucks?

REMEMBER!

Statistical questions are questions we collect data on!

Multiple Choice

Mrs. Blocker asks every 5th student off the bus what time they were picked up from their stop. This type of sampling is:

• Simple random sample

• Cluster Sample

• Systematic Sample

• Stratified Sample

Remember!

Systematic sample is where they have a "system" of how they are going to pick subjects (it's always going to be in an interval - every 2nd, 5th, 9th, etc...)

Multiple Choice

Mrs. Blocker wants to know the most popular electives at CRHS. Which method would provide her with a simple random sample?

• Choose every 4th student to ask

• Select 30 seniors to ask

• Ask every 6th person in the cafeteria until 60 have been asked

• Assign all of the students at CR a number and use a random number generator to select 60 students

Remember!

A simple RANDOM sample means you assign numbers and use a RANDOM number generator!

Multiple Choice

A study was done on 10 elementary school students struggling with reading. 5 students were given an intervention of repeated reading 30 minutes three times per week. The other 5 students continued in their classrooms with no intervention. Is this an example of an experiment or observational study? Why?

• An experiment because a treatment is being applied

• an observational study because a treatment is being applied

• An experiement because no treatment is applied

• an observational study because no treatment is applied

Remember!

An experiment applies a treatment, an observational study does not

Multiple Choice

If there is a 4/5 chance Mrs. Blocker will be irritated with Chandler, what is the probability she will not be irritated with Chandler?

• 4/5

• .20

• 1/5

• 1

Multiple Choice

What is the probability of liking snowmobiles but not liking skateboards?

• 25/35

• 25/160

• 80/125

• 25/35

Multiple Choice

Jaiden packs 5 pairs of shorts, 3 shirts, and 3 pairs of shoes for a vacation. How many different outfits can he create if he chooses one of each to wear?

• 11

• 2

• 8.5

• 45