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Standard Deviation and Standard Error of the Mean Standard Deviation and Standard Error of the Mean

Standard Deviation and Standard Error of the Mean - PowerPoint Presentation

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Uploaded On 2018-03-09

Standard Deviation and Standard Error of the Mean - PPT Presentation

Standard Deviation and a Bell Shaped Curve Bozeman Biology Video on Standard Deviation Standard deviation measures the spread or the variation in the data 68 of the individuals are within 1 standard deviation ID: 643883

data standard highlight deviation standard data deviation highlight calculate error sample sem size average set square biology letters root

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Presentation Transcript

Slide1

Standard Deviation and Standard Error of the MeanSlide2

Standard Deviation and a Bell Shaped CurveBozeman Biology Video on Standard Deviation

Standard deviation measures the spread or the variation in the data

68% of the individuals are within 1 standard deviation Slide3

Do men or women have a higher standard deviation? Slide4

What does that mean?

S = standard deviation

∑ = sum

√ = square root

n = # of data points = sample size

X = value

X = mean Slide5

Calculate standard deviation of the following data set:

S = √10/4

S = 1.58

= 10

1

2

3

4

5

DATA SET Slide6

Calculating SD using Excel

Enter data into the cells

To calculate the MEAN (Average) click an empty box and type the letters in black. The highlight data letters in white are not typed, just highlight the data:

=average(

highlight data)

To calculate SD

=

stdev

(

highlight data

)Slide7

Standard Error of the Mean SEx

or SEM

Bozeman Biology on SEM

Standard deviation divided by the square root of the sample size Slide8

Graphs and error bars…..Slide9

Correlation does NOT = Causation Slide10

Sample Brine Shrimp Data