Business Statistics 2 (MGTC3111)
Higher Institute of Commerce and Management (HICM)
Semester: First Semester
Level: 300
Year: 2014
STATISTICS II-MID TERM EXAMS 2013/14 HICM UNIVERSITY OF BAMENDA
NAME: MATRICULE:
Department:
INSTRUCTIONS: TICK THE RIGHT ANSWER OR FILL in the blank spaces where necessary. NB: All
calculations must be done on this question paper. (T-TRUE, F-FALSE)
TIME ALLOWED: 50 minutes.
1- P(A/B) = 0.6 and P(A) = 0.2, hence A and B are independent. TRUE: FALSE:
2- The sum of the probabilities, P
X1
, P
X2
,….P
X10
is always greater than one: TRUE: FALSE:
3- Binomial and normal distributions are examples of discrete probability distributions. TRUE: FALSE:
4- The rate at which accidents occur at the Bambui-Bambili stretch of the road is 2 accidents per day.
a) The probability that three accidents will occur in a day is
b) The probability that two accidents will occur in a day is
5- Study the following table
a) The value of K…………………………………………………..
b) The E(X) is ……………………………..
6. A statistics is a characteristic of ………………as a parameter is for …………………………
7. Random variables change with the samples. TRUE: FALSE:
8. If the population is finite tehn Var (
) = (
)
TRUE: FALSE:
9. Unbiasedness requires that …………………………………………………………….
10. A simple random sample of size two is drawn from a population with elements (0,2,5,6,9), the sample means
are …………………………..
11. A sample of size 9 is drawn from a population that is normally distributed with variance 16 and mean 6.5.
The standard deviation of the sampling distribution of means is ……………….and the mean is………
12. If the sample mean is 4.6, the sample size is 36; while the population mean is 3.9 and the variance is 9.9, the
standardized value (Z) is ………..
13. Efficiency of sample one over sample two will require that ……………………….
X 0 1 2 3 4
Probability of X 2k k 3k 1.5k 2.5k
www.schoolfaqs.net
