Q1 A committee of 5 doctors can be chosen from 9 doctors in ways

Q2 if the probability of a defective syringe is 0.4. The mean for the distribution of defective syringes in a total of 500 will

Q3 When a change in one variable is to a small extent matched by a change in the other, this is called correlation

Q4 The risk of rejecting a true hypothesis is known as error

Q5 The area in the normal distribution diagram that indicate that a null hypothesis should be rejected is called the region

Q6 A conjecture about a population parameter which may or may not be true is called

Q7 The width of the termite house is normally distributed with mean 3cm and standard deviation 0.14. what width value separates the widest 10% of all such house from the other 90%?

Q8 In measuring the height of some rabbit, the mean was 76, and the standard deviation was 6, calculate the standard height of rabbits having a height of 112

Q9 Evaluate P(-0.38 <=z <=1.25)

Q10 For a certain breed of monkey in a zoo, the time to start eating when food is supply is normally distributed with mean 1.25 min and standard deviation of 0.46 min. what is the probability that the time to start eating is between 1 min and 1.75min

Q11 If a normal distribution has u=30 and sd(a)= 5, what is the 6th percentile of the distribution?

Q12 Classifying variable into a numerical quantity that can be order and ranked is called variable

Q13 A system of taking element that constitute a sample at regular interval is called sampling

Q14 A random process of selecting a sample from a population selected for study is called

Q15 A sample obtained by dividing the population into subgroups of homogenous characteristics is called sampling

Q16 Adult males have normally distributed heights with mean equal to 70 in and standard deviation equal to 3 in, what percent are between 68 and 73 in?
0.4371
0.5889
0.6751
0.3445

Q17 If 3% of the yam tuber harvest from a portion of farmland get rotten within 5 weeks of harvest, find the probability that in a sample of 100 tubers less than or equal to 2 tubers will be defective
0.2187
0.7542
0.9941
0.4232

Q18 The mean yield of yam following the fertilizer treatment from 10 plots was 176.1kg with standard deviation 3.88. What is the 95% confidence limit for the mean yield of the yam?
(173.32, 178.88)
(152.35, 182.02)
(144.23, 179.77)
(162.42, 180.54)

Q19 In a poultry farming, the daily demand for water is normally distributed with a mean of 4000 litres and a standard deviation of 400 litres, if z-score of demand for a given day is 1.3. how many litres of water is the demand for the day?
5540 litres
6650 litres
3650 litres
4520 litres

Q20 When do we have a negative correlation?
when an increase in one variable is associated to a greater or lesser extent with an increase in the other
when a change in one variable is to a small extent matched by a change in the other.
when an increase in one variable is associated to a greater or lesser extent with a decrease in the other
when the two variables are not in matched at all, and there is no relationship between changes in one variable and changes in the other.

Q21 A biologist discover that the proportion of 5 micro organisms in pond are V=24, W=36, X=15,Y=27, Z=38, determine the relative frequency of organism X
8.23
25.22
10.71
15.23

Q22 Find the probability that in five tosses of a fair die a 5 appears at no time
2124/5561
2626/5671
3125/7776
1354/5004

Q23 A basket contains 5 oranges, 4 Mangoes , 3 Apples and 2 guavas. If 4 fruits are drawn at random, determine the probability that 1 of each fruit is drawn
0.55
0.12
0.31
0.48

Q24 Which of the following is not an experimentation principle?
diversion
Homogeneity
Replication
Randomization

Q25 if the probability of a defective syringe is 2/3. find the standard deviation for the distribution of defective syringes in a total of 729
15.2
12.73
20.56
25.63

Q26 Before applying a statistics in a research, which of the following statement is incorrect in what a researcher needs to know?
Statistical significance test for comparing one set of data with another
What technique to use for an investigation
Un-clarification of what to be achieved
Rules of using the technique, using correctly the statistical techniques for analysis of biological data

Q27 Ten percent of the tools produced in a certain manufacturing process turn out to be defective. Find the probability that in a sample of 10 tools chosen at random exactly 2 will be defective by using poisson approximation to binomial distribution
0.74
0.58
0.62
0.18

Q28 The average number of customers arriving on any one day at poultry farming is 12, what is the probability that on a given day fewer than 9 customers will arrive at the farm?
0.16
1.4
0.13
0.72

Q29 Find the probability that seven of 10 persons will recover from a tropical disease if we can assume independence and the probability is 0.80 that any one of them will recover from the disease
0.45
0.12
0.2
0.39

Q30 Weight measurement is conducted on new harvest of Watermelon, Thirty (n=30) randomly selected watermelon are carefully weigh and the weight recorded, the mean weight of the sample is 28.6g and the sample standard deviation is 2.2g. Estimate a 95% confidence interval for the mean weight in the whole watermelon harvest
(25.72, 31.24)
(21.34, 28.41)
(27.81, 29.39)
(25.61, 29.12)

Q31 The seven pairs of values (x, y) below shows the number of absences, x, in a BIO206 tutorial at Abuja study centre and the final exam grade, y, for 7 students. Find the equation of regression between x and y (1, 95), (0 , 90), (2,90), (6 ,55 ), (4, 70), (3 ,80), (3,85)
y = 3.56x - 9.57
y = -7.12x+12.38
y = -2.55x - 6.23
y = -6.55x+98.49

Q32 The seven pairs of values (x, y) below shows the number of absences, x, in a BIO206 tutorial at Abuja study centre and the final exam grade, y, for 7 students. Find the correlation coefficient between x and y (1, 95), (0 , 90), (2,90), (6 ,55 ), (4, 70), (3 ,80), (3,85)
r = 0.82
r = -0.93
r = -0.56
r = 0.75

Q33 In a poultry farming, the daily demand for water is normally distributed with a mean of 4000 litres and a standard deviation of 400 litres, if z-score of demand for a given day is 1.3. how many litres of water is the demand for the day?
3650 litres
6650 litres
4520 litres
5540 litres

Q34 Given a sample size and standard deviation as n=144 and s=24 respectively, find the population standard deviation___________
2
4
6
8

Q35 The mean yield of yam following the fertilizer treatment from 10 plots was 176.1kg with standard deviation 3.88. What is the 95% confidence limit for the mean yield of the yam?
(152.35, 182.02)
(144.23, 179.77)
(162.42, 180.54)
(173.32, 178.88)