Posted by **ReeSha** on Thursday, July 7, 2011 at 2:44pm.

The Hill of Tara in Ireland is a place of great archaeological importance. This region has been occupied by people for more than 4,000 years. Geomagnetic surveys detect subsurface anomalies in the earth's magnetic field. These surveys have led to many significant archaeological discoveries. After collecting data, the next step is to begin a statistical study. The following data measure magnetic susceptibility (centimeter-gram-second 10−6) on two of the main grids of the Hill of Tara.

Grid E: x variable

14.51 14.88 35.23 17.10 24.87 6.74 13.77

21.17 11.18 13.77 35.60 28.20 11.55 7.85

Grid H: y variable

16.11 40.55 23.63 51.83 20.81 17.52 45.25

46.19 12.35 10.00 46.66 26.92 13.29 24.10

(a) Compute Óx, Óx2, Óy, Óy2. (Round your answers to two decimal places.)

Óx =__

Óx2 = ___

Óy = ___

Óy2 = ___

(b) Use the results of part (a) to compute the sample mean, variance, and standard deviation for x and for y. (Round your answers to two decimal places.)

Grid E: x =

s2 =

s =

Grid H: y =

s2 =

s =

(c) Compute a 75% Chebyshev interval around the mean for x values and also for y values. (Round your answers to two decimal places.)

Grid E:

11 to 12

Grid H:

13 to 14

- Statistics -
**PsyDAG**, Friday, July 8, 2011 at 7:15pm
I cannot answer all your questions. I do not know what the "apple" symbol signifies.

b. For both x and y, add the scores and divide by n to find the mean. Subtract the mean from each score, and square each one. The sum of these squared differences = variance. The variance = s^2 = s squared, so standard deviation = square root of variance.

- Statistics -
**Anonymous**, Sunday, September 28, 2014 at 1:08pm
Gjbdd

## Answer This Question

## Related Questions

- math - identify the variable, population and is this quantitative or qualitative...
- Statistics - The archeological site of Tara is more than 4000 years old. ...
- Statistics - The archeological site of Tara is more than 4000 years old. ...
- ireland - Hey. I was wondering if you could help me.... what are the main ...
- Math - Not sure how to phrase this question but - I want to know who won a ...
- Business Law - Juan thinks he would like to purchase Tara's house, but doesn't ...
- Sociology - Why do Sociologist use Surveys and what type of data do they receive...
- magnetic field - A square loop with resistance R=0.001 Ohms,mass 1.0 gram, and ...
- Physics 2 - what magnetic force would an electron experience due to Earth’s ...
- physics - A 42 mT magnetic field points due west. If a proton of kinetic energy ...

More Related Questions