1 / 13

Standard Deviation

AP Stats. Chapter 6 Review. Standard Deviation. Square root of the Variance:. But use a calculator!! STAT CALC 1-VAR Stats. -or- 2 nd STAT MATH stdDev(. AP Stats. Chapter 6 Review. Z - Scores. Determines number of standard deviations from the mean:. AP Stats. Chapter 6 Review.

tuan
Télécharger la présentation

Standard Deviation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. AP Stats Chapter 6 Review Standard Deviation Square root of the Variance: But use a calculator!! STAT CALC 1-VAR Stats -or- 2nd STAT MATH stdDev(

  2. AP Stats Chapter 6 Review Z - Scores Determines number of standard deviations from the mean:

  3. AP Stats Chapter 6 Review Standardizing GOALS: move center (mean) to zero change units to standard deviations

  4. AP Stats Chapter 6 Review Standardizing Shift Left/Right – ADD constant to everything EXCEPT spread: range, IQR, standard deviation

  5. AP Stats Chapter 6 Review Standardizing Changing Spread (units) – MULTIPLY EVERYTHING by constant!

  6. AP Stats Chapter 6 Review Normal Model +/- 1 std.dev.

  7. AP Stats Chapter 6 Review Normal Model +/- 2 std. dev.

  8. AP Stats Chapter 6 Review Normal Model +/- 3 std.dev.

  9. AP Stats Chapter 6 Review Graphing a Normal ModelTI-83 • Defaults: mean=0, std.dev.=1 • Turn all STAT PLOTS OFF • You will need to set the window to fix xmin, xmax, xscale. • ZOOM – 0 (zoomFit) Enter a formula in ‘y=‘

  10. AP Stats Chapter 6 Review Z-Scores PercentilesTI-83 To find the percentage of data that fall below a given z-score*: If min is , use –9999 If max is , use 9999 Defaults: mean=0, std.dev.=1 *you can also use the z-table

  11. AP Stats Chapter 6 Review Z-Scores PercentilesTI-83 To find the z-score that cuts off a percentage of data*: Defaults: mean=0, std.dev.=1 *you can also use the z-table

  12. AP Stats Chapter 6 Review Z-Scores PercentilesTI-83 To SHADE the desired area given z-scores: • Be sure model has been graphed using ‘y=‘ • Clear any previous shading by  2nd DRAW ClrDraw • Enter z-scores: 2nd DISTR DRAW If min is , use –9999 If max is , use 9999 Defaults: mean=0, std.dev.=1

  13. AP Stats Chapter 6 Review Is a normal model the best for your data? To find out, do a Normal Probability Plot Are You Normal? • Enter data into L1 • Turn a STAT PLOT ON • Select the last ‘Type’ (looks like a line graph) • Select the correct Data List • Choose ‘Y’ for Data Axis • Specify the Mark you want (it doesn’t matter) • ZoomStat The more ‘linear’, the more ‘normal’!

More Related