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Ahs2307:Data Design And Data Analysis Question Paper
Ahs2307:Data Design And Data Analysis
Course:Bachelor Of Horticulture
Institution: Meru University Of Science And Technology question papers
Exam Year:2013
QUESTION ONE – 30 MARKS
(a) Define the following terms: (i) Experiment (1Mark) (ii) Treatment (1Mark) (iii)Factor (1Mark) (b) State and briefly explain any three types of experimental variables. (6Marks) (c) Differentiate a sample from a population. (2Marks) (d) What is an experimental design? (2Marks) (e) State and explain factors which affect the results of an experimental site. (10Marks) (f) Statistical method of data analysis is commonly used by researchers. State any three limitations of statistics. (3Marks) (g) Write a brief description of Completely Randomised Block Design (CRBD) (4Marks)
QUESTION TWO – 20MARKS
(a) Researchers make mistakes during data gathering and harvesting stage. Explain any five common mistakes committed at this stage which may affect the results. (10Marks)
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(b) Below is a table showing the amount of milk produced by four different types of feeds. Determine whether there is any significance difference between the feeds at (i) 95% (ii) 99% significance levels. (10Marks)
Animal Feed
Animal 1
Animal 2
Animal 3
Animal 4 A 8 9 10 12 B 7 8 8 10 C 11 10 9 11 D 8 11 11 12
QUESTION THREE – 20 MARKS
(a) (i) Name any three types of data that can be collected by an agricultural researcher. (3Marks) (ii) An agricultural researcher had his collected data refuted by the supervisor on grounds of cultural mistakes made while conducting the experiment. State five of these mistakes. (5Marks)
(b) The table below shows yields in bags per acre of land of four different maize varieties treated with three different types of fertilizers. Using a 0.01 significance level determine whether there is any significance difference in yields due to: (i) Fertilizers (6Marks) (ii) Crop varieties (6Marks)
Variety 1 Variety 11 Variety 111 Variety IV Fertilizer A 5 6 7 7 Fertilizer B 9 8 10 7 Fertilizer C 6 7 6 5
QUESTION FOUR – 20 MARKS
(a) Using diagrams, differentiate randomized complete block design from the Latin square (6Marks) (b) A researcher wanted to determine the effectiveness of four different types of fertilizers A, B, C and d on the yields of a given Tomato variety. To accomplish this, the yield in crates per plot were determined but were repeated in different seasons. Perform an analysis of variance to determine at the 0.05 significance level whether there is a difference : (i) Between the fertilizers (ii) Between the seasons. (14Marks)
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SEASON 1 SEASON 11 Plot 1 Plot 2 Plot 3 Plot 4 Plot 5 Plot 1 Plot 2 Plot 3 Plot 4 Plot 5 Fertilizer A 6 4 5 5 5 5 7 4 6 8 Fertilizer B 10 8 7 7 9 7 9 12 8 8 Fertilizer C 7 5 6 5 9 9 7 5 4 6 Fertilizer D 8 4 6 5 5 5 7 9 7 10
QUESTION FIVE – 20 MARKS
(a) Explain any four mistakes commonly committed by an agricultural researcher during cultural crop management process. (8Marks)
(b) A researcher has noticed that her farm (plot) is experiencing soil fertility variation. He has decided to test the effect of four fertilizers A,B,C, and D on wheat yields using a Latin-square design in order to eliminate the error due to soil fertility variation. The numbers in the table shows the yields in bags per acre. Perform a ANOVA to determine whether there is a difference between the fertilizers at significance levels (a) 0.0.5 (b) 0.01 (12Marks)
A18 C21 D25 B11 B15 A20 C23 D24 C22 D21 B10 A17
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