Using And Understanding Medical Statistics

Using and Understanding Medical Statistics

The oldest and the latest in dentistry

Mouse Tooth Grown From Stem Cells in Mouth
August 3, 2009—Denture wearers take note: Science is one step closer to growing replacement teeth "from seed."
Researchers at the Tokyo University of Science created a "tooth germ" from mouse stem Read More

9,000-Year-Old Drilled Teeth Are Work of Stone Age Dentists
Human teeth excavated from an archaeological site in Pakistan show that dentistry was thriving as recently as 9,000 years ago. Read More

Oldest Dentistry in Americas Found -- Fang Dentures?
he earliest dental patient in the Americas spent many hours with the dentist and likely experienced excruciating—perhaps deadly—pain, according to an analysis released today of skeletal remains uncovered in the volcanic highlands of west-central Mexico. Read more

Calculating Degree Of Freedom In A Table

Q. The degree of freedom in a 4X4 table is

1. 4
2. 8
3. 9
4. 16

Answers is 3. 9

The degree of freedom in a table is calculated as
Degree of freedom = (r-1) X (c-1)
Where r= number of rows and c= number of columns
So (4-1) X (4-1) = 9 .

Correlation Between Variables

Q. Which of the following shows greatest correlation between variables ?

1. r= + 0.25
2. r= + 0.55
3. r= - 0.85
4. r= + 1.25

Answer is 3. r= - 0.85

The correlation in option no. 3 is very high, though it is negative correlation.


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