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AP Summer Assignment Due July 31, 2017 via email to [email protected] 36 Points

Descriptive Statistics using Spreadsheets

Practice Assignment

Find Mrs. Langley’s website on www.svsd.net under Teacher Websites in the Senior High School page. Find the section for Summer Assignment, and click on the link to download the Table of Presidential Ages. This is just a practice assignment, so you can check your answers with the ones provided before completing the graded assignment.

Google Spreadsheets, Microsoft Excel, and other spreadsheet programs work by obeying commands that you assign it to follow. Off to the side of the list of presidential ages, complete the table of statistical calculations by executing the following commands. The equals sign in the cell tells the program you are entering an equation. The values inside the parentheses represent the starting and ending cells, called the “array”. It is important that you DO NOT use the space bar at all when typing in the commands. Notice that for the calculation of the , you must also tell the program which to find, in addition to the array.

Statistical Calculation Spreadsheet Command Resulting Output =(B2:B46) 54.97777778 =MEDIAN(B2:B46) 55 =MODE(B2:B46) 54 Count (Number of Items) =COUNT(B2:B46) 45 Minimum =MIN(B2:B46) 42 Maximum =MAX(B2:B46) 70 =MAX(B2:B46)-MIN(B2:B46) 28 Sum =SUM(B2:B46) 2474 (of ) =STDEV(B2:B46) 6.572978047 1st Quartile =QUARTILE(B2:B46,1) 51 3rd Quartile =QUARTILE(B2:B46,3) 58

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Frequency Tables & Histograms display the of that occur within a given interval. Therefore, you must determine the size of the interval (with equal widths), and count how many values occur within each interval.

The program will count the number of values in the provided interval, but the command is rather intricate. To find the number of presidential ages between 40 and 44 years, the command looks like this: =COUNTIFS(B2:B45,">=40",B2:B45,"<=44"). The command COUNTIFS provides the frequency under certain conditions. We then give the array and the first condition, values greater than or equal to 40 in quotes. Then give the array again and the second condition, less than or equal to 44. Adapt the conditions for the rest of the intervals on the frequency table. Using these functions will prevent you from having to count the frequencies manually. Your completed frequency table should look like this:

Age Range Frequency 40-44 2 45-49 7 50-54 13 55-59 12 60-64 7 65-69 3 70-74 1

The following directions describe how to create the from your frequency table. 1. Select the entire frequency table. 2. Click the Insert tab and select Chart. 3. Select the vertical . 4. Once the graph comes up, you should go to Quick Layout or Chart Layout to find the one where the bars touch. We will talk about this during the school year, but histogram bars should touch. After changing the layout, the following histogram should appear:

Presidential Ages 14 12 10 8 6

Frequency 4 2 0 40-44 45-49 50-54 55-59 60-64 65-69 70-74 Age Range

You can make many modifications to the chart. Try labeling the axes, changing the title, and changing the colors/appearance of the graph.

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Actual Summer Assignment to Submit – 36 points

Part 1:

 Back on Mrs. Langley’s webpage under Summer Assignment, download the Table of Elderly Populations. Once the spreadsheet opens, make sure you save the document in the following format, StatsSummerAssignment-LastName_FirstName. Use the procedures described above to complete the following in the space provided in the spreadsheet: 1. Calculate the descriptive statistics (all of the values under the Statistical Calculations table). 2. Create a new frequency table using an appropriate interval for these data. Make sure the intervals are of equal width. Give extra consideration to data values that fall on or near the interval boundaries. For example, if your intervals are 5-9 and 10-14, where does a state like Georgia (9.9) fall? 3. Construct a histogram for these data.

Part 2:

 Open and rename a new tab at the bottom of the spreadsheet by double clicking on “SHEET 2.” Label it, Part 2. Do the same for SHEET 1, and label it, Part 1.

 Use a world almanac or an online source (try http://www.infoplease.com/almanacs.html) to select an interesting set of data, and enter it as a table in the spreadsheet on the Part 2 page. Make sure you label what the data represent. 1. Calculate the descriptive statistics. 2. Create a new frequency table using an appropriate interval for these data. Give extra consideration to data values that fall on or near the interval boundaries. 3. Construct a histogram for these data.

Save your work from these two problems (Elderly Populations and Data of Your Choice) and submit the single Excel document to Mrs. Langley via email ([email protected]) by 11:59 PM on July 31, 2017.

Warning: Be sure to use the spreadsheet commands to perform all of the calculations. I will be able to tell if you did not use them, and there will be no points awarded for those calculations. This is an Excel assignment, and I am interested in your ability to use Excel to make these calculations. 3