# Category Archives: Data Analysis

## Turtles, Turtles, Turtles

Today, we had a great visit with Dr. Windmiller. We discussed many issues, including whether Zelva’s mother, turtle 2030, should continue to have her hatchlings placed in the Head Start program as well as what is the best habitat to release the headstarts.

I would you to comment on both points.

- Should turtle mother 2030 continue to have her hatchlings placed in the head start program due to the eating problems that some of her hatchlings are having this year.
- What is the best habitat to release the head starts and why?
- What type of data would you like to have the next time Dr. Windmiller comes in?

## Comparing Blanding’s Turtles Born at Different Locations

This year, there are three different hatching locations for the Blanding’s turtle head starts: Great Meadows area in Concord, Littleton (on the side of Route 2) and Oxbow National Wildlife Refuge. Your job for this blog is to do the following:

1. Read about both Great Meadow and Oxbow National Wildlife Refuges by clicking on the links. Name three interesting facts about **EACH** wildlife refuge.

2. On the spreadsheet that you received about the location of hatching, dates of hatching, and December weights, please answer the following questions:

a. What is the range of hatching dates at Great Meadows? (when did the first group hatch and when did the last group hatch?)

b. What is the range of hatching dates at Oxbow? (when did the first group hatch and when did the last group hatch?)

c. When did the Littleton turtles hatch?

d. What is the range of December weights for the Great Meadows turtles? (the lowest weight to the highest weight)

e. What is the range of December weights for the Littleton turtles? (the lowest weight to the highest weight)

f. What is the range of December weights for the Oxbow turtles? (the lowest weight to the highest weight)

3. What differences do you notice and why do you think there are these differences? What other data might help you figure out these differences?

**DUE THURSDAY, JANUARY 12TH**

## 2011 Hatchlings By the Number

Now that we have our two new Blanding’s turtle hatchlings, it’s time to reacquaint ourselves with data analysis. Take a look at the following three tables and answer the questions about each. Remember to answer your questions in full sentences. You can click on the tables to make them easier to read. A reminder of data analysis terms:

1. Range: list the data from the lowest number to the highest number.

2. Median: the middle number in a set of data. If it is an odd number of data, it is the middle number. If it is an even number, you add the middle two numbers and divide it by two.

1. What is the range of lengths for the hatchlings of Turtle 3300? What is the difference between the lowest and highest length? What is the median length?

2. What is the range of weights for the hatchlings of Turtle 3300? What is the difference between the lowest and heaviest weight? What is the median weight?

3. Where does our turtle 224 fall within this data?

1. What is the range of lengths for the hatchlings of Turtle 334? What is the difference between the lowest and highest length? What is the median length?

2. What is the range of weights for the hatchlings of Turtle 334? What is the difference between the lowest and heaviest weight? What is the median weight?

3. Where does our turtle 232 fall within this data?

Take a look at the number of hatchlings for both these turtle mothers. How would you describe the number of live births that each turtle mother had in 2011? What would you attribute this difference to?

## Look How We’ve Changed!

We’ve had Yertle since school started in September and Lynn-D since the middle of March. During both of those time frames,

they have changed in many ways. From little hatchlings, they now look like miniature adult Blanding’s turtles. Initially, they were eating a few few small turtle pellets, now they are eating earthworms, mealworms, aquatic creatures, and for Yertle, as

many crayfish as he can get his mouth on! For tonight’s blog, due on **Thursday**, you are to analyze the following data and answer the following questions. Remember that you can click on the table to make it larger. Make sure you use complete sentences in your answer.

1. How much weight did Yertle gain from when he hatched until June 1st?

2. How much longer did Yertle become from his hatching date until June 1st?

3. About how many times larger did Yertle become during this time (hint divide the June weight by the birth weight)

4. During what two months did Yertle gain the most weight?

5. How much weight did Lynn-D gain from when she hatched until June 1st?

6. How much longer did Lynn-D become from her hatching date until June 1st?

7. About how many times larger did Lynn-D become during this time (hint divide the June weight by the birth weight)

8. During what two months did Lynn-D gain the most weight?

**On two separate pieces of graph paper, create two graphs: one comparing the weights of Yertle and Lynn-D and one comparing the lengths of Yertle and Lynn-D. Your graphs should contain a title, labels, key, and should be done in color.**

## Introducing Lynn-D By The Numbers

This week, Room 305B welcomed the newest member of our classroom: Destroyer, a sibling of Yertle and Bowser (their mother is Turtle Number 2033). Destroyer was very generously transferred from David Winchester and his students from Lynn Classical High School. In honor of their generosity, the students decided to name the new turtle Lynn, and decided to honor the original name of Destroyer by a nickname of “D” So, Destroyer is now known as Lynn-D in our classroom. The two turtles have been getting to know one another. Yertle has exhibited some of the behavior that Bowser use to do to him, but he has welcomed Lynn-D into the hideaway without any issue (this was a problem when Yertle had a playdate with Mrs. Dillon’s turtles the week we came back from vacation.) The students are delighted to have Lynn-D in our tank.

So, now it’s time to check Lynn-D’s numbers out. For this week’s blog, due on Thursday, you are to answer the following questions. Make sure you answer in complete sentences and that you number your responses. Remember that you can click on each image to make it larger.

A. Take a look at the March weights that have been recorded for all the 2010 Hatchlings (note that the zoo turtles do not have names) and answer the following questions:

1. What is the range (in grams) of all of the turtles’ weights?

2. Where does Lynn-D fall within this range?

3. What is the difference between Lynn-D’s weight and the heaviest turtle (please use this turtles’ name or number)

4. What is the difference between Lynn-D’s weight and the lightest turtle (please use this turtle’s name or number)

B. Using the table below, please answer the following questions:

1. Based on the gender of all of 2033’s siblings (Bowser was also a male who weighed 85 grams in February), what do you predict Lynn-D’s gender to be? How did you arrive at your hypothesis?

Part C: Take a look at Lynn-D’s weights and lengths through the months and answer the questions associated with that table:

1. How much weight has Lynn-D gained since the hatchling weight?

2. How much longer has Lynn-D grown since the length at hatching?

3. Between what two months was there the least amount of weight gained? How much weight was gained during this time?

4. Between what two months was there the greatest amount of weight gained? How much weight was gained during this time?

5. Based on Lynn-D’s growth chart, what do you predict Lynn-D’s weight and length to be on April 1st? How did you come up with your prediction?

## What Does It Mean???

A good friend and colleague of mine likes to say when it comes to analyzing data, “what does it mean?” To the left, is a graph of the mean weight of the Blanding’s turtle hatchlings. The three elementary schools, the other 2010 hatchlings, and the data from the 2008 and 2009 hatchlings are all represented here. Take a close look at the graph (you can click on it to enlarge it) and then answer the following questions. Make sure you use complete sentences, label your answers, and make sure you use grams in your answers and not (g).

a. What do you notice about the Thoreau hatchlings compared to the other hatchlings. Why do you think this is so?

b. In general, how do all the 2010 hatchlings compare to the 2008 and 2009 hatchlings? Why do you think there is a difference?

**What Does It Mean? Part Two**

When I was looking at the data this weekend, I noticed some really interesting pieces of data and was wondering what you thought about this data. So, take a look at this chart and answer a few questions about this data.

a. What is the range of the January weights for Turtle #2031’s hatchlings?

b. Do you think this range is typical if you looked at Yertle and Bowser’s mother’s hatchlings in January?

c. What are the outliers for these hatchlings?

d. What is the median weight for these hatchlings?

e. How does Yertle at 68 grams and Bowser at 70 grams compare to the median weight of these hatchlings?

f. What might account for the weights of this particular bunch of hatchlings?

## What a Difference a Year Makes!

I selected 14 turtles from 2009 Hatchling data and 2010 Hatchling data to analyze their weights at the beginning of December. You can click on the table to make it larger.

For Thursday, please analyze the data and answer the following questions. Make sure you use answer in complete sentences and that you LABEL your answers and use **grams **in your response**.**

a. What is the range of the 2009 hatchlings’ weights in December?

b. What is the range of the 2010 hatchlings’ weights in December?

c. What is the median weight for the 2009 hatchlings?

d. What is the median weight for the 2010 hatchlings?

e. How do Yertle and Bowser compare to the sample of the 2010 hatchlings?

f. How do Yertle and Bowser compare to the 2009 December hatchling weights?

g. Why do you think there is a difference between the 2009 and 2010 December hatchling weights?