W1-2-60-1-6
JOMO KENYATTA UNIVERSITY
OF
AGRICULTURE AND TECHNOLOGY
University Examinations 2012/2013
THIRD YEAR FIRST SEMESTER EXAMINATION FOR DEGREE OF BACHELOR OF SCIENCE IN PUBLIC HEALTH
MLS 2330: MEDICAL STATISTICS
DATE: AUGUST 2012 TIME: 2 HOURS
INSTRUCTIONS: ANSWER QUESTION ONE AND ANY OTHER TWO QUESTIONS
QUESTION ONE
(a) State the four reasons for learning statistics in medical investigation.
(4 mks)
(b) The mean of the number of patients over in the 1st quarter in a hospital is 87 and standard deviation is 5. The mean of patients in the 2nd quarter was 5225 and standard deviation is 773. Compare the variations of the patients in the two quarters. (7 mks)
(c) Define the following terms as used in medical statistics (8 mks)
i. Population
ii. Sample
iii. Categorical variables
iv. Binary variables
(d) A job place director claim that the average starting salary for nurses is Kshs. 24,000/=. A sample of 10 nurses has a mean of Kshs. 23,450/= and standard deviation of kshs. 400. Test the director’s claim at (6 mks)
(e) The following data were collected on the number of blood tests a local hospital conducted for a random sample of 50 days. Find the mean, meridian and mode of the blood tests. (5 mks)
QUESTION TWO
(a) Determine the geometric mean of 3, 4, and 9; harmonic mean of 1,4,5 and 2 and weighted mean of:
| Cost of fuel | $1.19 | $1.27 | $1.32 |
| No. of litres | 5 | 8 | 15 |
In a binomial distribution, a coin is tossed three times. Find the probability of getting exactly two heads (5 mks)
(c) The following is a data set for plasma volume measurement. Find the standard deviation of the plasma volume (5 mks)
2.75, 2.86, 3.37, 2.76, 2.62, 3.49, 3.05, 3.12
QUESTION THREE
A researcher tests three different branch of breakfast drinks for the number of multi equivalent of potassium per quart each contain. The following data are obtained
Brand A: 4.7, 3.2, 5.1, 5.2, 5.0
Brand B: 5.3, 6.4, 7.3, 6.8, 7.2
Brand C: 6.3, 8.2, 6.2, 7.1, 6.6
At , test the hypothesis that all brands contain the same amount of potassium using the Kruskal-wallis test (20 mks)
QUESTION FOUR
A national magazine claims that the average college students watches less television than the general public. The national average is 29.4 hours per week with б= 2 hours. A sample of 25 students has mean of 27 hours. Test the claim at . (20 mks)
QUESTION FIVE
Three cards are drawn from a desk of cards one after the other without replacement. Find probabilities of the following
i. Getting three jacks
ii. Getting an ace, a king and queen in order
iii. Getting a club, a spade and a heart in order
iv. Getting three clubs (20 mks)
