Introduction to EngineeringMicrosoft Excel - 2

Agenda Scatter Plots Trend Lines

Review from last class…

Year Births Deaths 1976 3,167,788 1,909,440 1980 3,612,258 1,989,841 1982 3,680,537 1,974,797 1984 3,669,141 2,039,369 1986 3,756,547 2,105,361 1988 3,909,510 2,167,999 1990 4,158,212 2,148,463 1991 4,110,907 2,169,518 1992 4,065,014 2,175,613 1993 4,000,240 2,268,553 1994 3,952,767 2,278,994

Number of Births and Deathsin the United States

0

1,000,000

2,000,000

3,000,000

4,000,000

5,000,000

Nu

mb

er

Births Deaths

Births and Deaths in the US 19761980198219841986198819901991199219931994

01,000,0002,000,0003,000,0004,000,0005,000,000

Nu

mb

er

1976 1984 1990 1993

Year

Births and Deaths in the US

births

deaths

Scatter Plot of Example Data

U.S. Births and Deaths 1976-1994

1,500,000

2,000,000

2,500,000

3,000,000

3,500,000

4,000,000

4,500,000

1975 1980 1985 1990 1995 2000

Year

births

deaths

Q: How many births and deaths would we expect in 1998?

Making a Scatter Plot

Year Births Deaths1976 3,167,788 1,909,4401980 3,612,258 1,989,8411982 3,680,537 2,039,3691984 3,669,141 2,105,3611986 3,756,547 2,105,3611988 3,909,510 2,167,9991990 4,158,212 2,148,4631991 4,110,907 2,169,5181992 4,065,014 2,175,6131993 4,000,240 2,268,5531994 3,952,767 2,278,994

1. Select either the birth or death column.

2. Click on insert new chart and choose XY (Scatter)

Scatter plot cont.

3. Click on Series and then select the X-values

4. ‘Add’ another Series and select the X and Y-values for it also

5. Click ‘Next’ 6. Add in titles and labels

and then click ‘Finish’

To add another series

To select Y-Values

To select X-Values

To name the series

Complete Plot of Data

Births and Deaths (1976-1994)

0500,000

1,000,0001,500,0002,000,0002,500,0003,000,0003,500,0004,000,0004,500,000

1975 1980 1985 1990 1995

Year

Nu

mb

er

Births

Deaths

Trendline (cont.)

Under the Options tab, you should choose to show the equation of the line on the chart

U.S. Births and Deaths 1976-1994

y = 45,030x - 85,645,424

y = 19,991x - 37,609,4781,500,000

2,000,000

2,500,000

3,000,000

3,500,000

4,000,000

4,500,000

1975 1985 1995

Year

births

deaths

Linear (births)

Linear (deaths)

Using these equations, we can predict the numbers of births and deaths expected in 1998:

births = 4,324,516deaths = 2,332,540

Do you see any problem with these predictions?

Assignment #10: Scatter Plot & Trendlines

Using the data, make a scatter chart and add a trend line to predict the average starting salary for an engineering with a B.S. degree in 2005.

Low High Average1990-1991 $26,000 $37,000 $31,5001991-1992 $21,000 $38,000 $29,5001992-1993 $28,000 $34,000 $31,0001993-1994 $27,000 $37,000 $32,0001994-1995 $26,000 $37,000 $31,5001995-1996 $30,000 $39,000 $34,5001996-1997 $29,000 $41,000 $35,0001997-1998 $34,000 $43,000 $38,5001998-1999 $30,000 $46,000 $38,0001999-2000 $36,000 $51,000 $43,500

Salary Offered to OSU Engineering Graduates with a B.S. Degree

Data gathered from Ohio State Engineering Career Services