STAT 106 : Biostatistics
Colleges of medicine
Descriptive statistics –Measure of location and dispersion – Elementary probability –Random variable and probability distribution-Central limit theorem and application.
Elementary Biostatistics with Applications
From Saudi Arabia
By : Dr.Nancy A.Eyink Hasabelnaby
Home works :
Q1: For each the following ,indicate the variable, whether the variable is qualitative or quantitative ,the population, and the sample size.
a) For a sample of 15 mice, we measure the length of time (in minutes ) it takes a mouse to perform a certain task after a period of training .
Variable: length of time(quantitative) ,
Population: mice , Sample size: 15 mice.
b) For a sample of 49 cars in Saudi Arabia ,we measure the color of the car
Variable: The color of the car (qualitative) ,
Population: cars in saudi arabia , Sample size: 49 cars.
c) Suppose we measure the temperature for the a sample of 25 animals having a certain disease .
Variable: Tempreture of animals having a certain disease (quantitative) ,
Population: animals having a certain disease ,
Sample size: 25 animals having a certain disease .
Q2: The following stem and leaf represents the age of women when having their first baby.
Answer the following questions
Frequency Stem & Leaf
8.00 1 . 56678899
16.00 2 . 0001112233333444
14.00 2 . 55555558888999
21.00 3 . 000000111111222333344
12.00 3 . 555566677889
4.00 4 . 0013
Stem width: 10.00
Each leaf: 1 case(s)
1)The number of women with age more than 30 when having their baby is
(a)16 (b) 37 (c) 31 (d)15 (f) none of these
2)The percentage of women with age Less than 26 when having their baby is
(a) 32% (b) 41.33% (c) 50.67% (d) 44.29% (e) 31% (f) none of these
3)The range is
(a) 23 (b) 28 (c) 17 (d) 2 (e) 30 (f) none of these
4) The mode is
(a) 25,30 (b) 21 (c)31 (d) 5 (e) 25 (f) 30,31
(g) none of these