Biology, HSSC-Punjab Second Year. This chapter is split into 40 topics and has
1,006 practice questions. The topics covered are listed below, followed by
10 free sample questions from the chapter.
Topics in this chapter
Standard Deviation: Concept and Interpretation30 questions
Range as a Measure of Spread30 questions
Mean of Ungrouped Data30 questions
Pie Charts30 questions
Percentiles and Quartiles30 questions
Chapter Review: Biostatistics30 questions
Calculating the Standard Deviation30 questions
Error Bars: Range and Standard Deviation30 questions
Steps of Experimental Design and the High-Fat Diet Experiment30 questions
Mode of Ungrouped and Grouped Data30 questions
Median30 questions
X-Axis Data Figures (Line Graphs)30 questions
Applications of Biostatistics in Medicine and Public Health30 questions
Experimental Design: Variables, Control and Experimental Groups30 questions
Biostatistics: Definition and Components30 questions
Mean of Grouped Data30 questions
Bar Charts30 questions
Mean: Worked Problems in Biological Contexts22 questions
Mean: Missing Values, Totals and Combined Groups22 questions
Mean: Effect of Adding, Removing or Changing Data22 questions
Grouped Mean: Class Interval Problems22 questions
Median: Worked Problems with Unordered Data22 questions
Mode: Worked Problems and the Modal Class22 questions
Standard Deviation: Worked Problems (Set A)22 questions
Standard Deviation: Variance and Squared Deviations22 questions
Range: Worked Problems and Effect of New Readings22 questions
Percentiles: Rank Calculations22 questions
Percentiles: Interpolated Values22 questions
Pie Charts: Sector Angle and Percentage Problems22 questions
Pie Charts: Reverse Counts, Largest and Missing Sectors22 questions
Bar Charts: Relative Abundance and Scale Problems22 questions
Error Bars: Mean, SD and Range Problems22 questions
Choosing Mean, Median or Mode: Scenarios21 questions
Choosing Charts for Biological Data21 questions
Identifying Variables and Groups in Experiments21 questions
Designing Fair Experiments: Control and Bias21 questions
Reading the Chapter's Tables and Worked Examples22 questions
Descriptive and Inferential Statistics: Scenarios20 questions
Exercise Items: Short and Long Question Answers20 questions
Sample questions: Biostatistics
10 sample questions with the correct answer and an explanation. Try to answer each one before reading the explanation.
Q1. Which sequence lists the six components of biostatistics in the order given in the chapter?
A. Data collection, study design, data analysis, data management, presentation, interpretation
B. Data management, study design, data collection, interpretation, data analysis, presentation
C. Study design, data analysis, data collection, interpretation, data management, presentation
D. Study design, data collection, data management, data analysis, interpretation, presentation(correct answer)
Answer: D.The chapter lists study design, data collection, data management and processing, data analysis, interpretation of results, then presentation and communication.
Q2. The readings for the wing spans of 10 butterflies are 56, 43, 75, 59, 59, 44, 63, 69, 57, 41 (mm). The median is:
A. 59 mm
B. 57 mm
C. 51.5 mm
D. 58 mm(correct answer)
Answer: D.Ordered data: 41, 43, 44, 56, 57, 59, 59, 63, 69, 75. n = 10 is even, so the median is the mean of the 5th and 6th values = (57 + 59)/2 = 58.
Q3. The readings for the masses of 6 mango fruits are 227, 303, 261, 292, 248, 291 (g). The median is:
A. 276.5 g
B. 261 g
C. 276 g(correct answer)
D. 291 g
Answer: C.Ordered data: 227, 248, 261, 291, 292, 303. n = 6 is even, so the median is the mean of the 3rd and 4th values = (261 + 291)/2 = 276.
Q4. The readings for the spore counts in 8 soil samples are 79, 82, 49, 42, 34, 85, 75, 66 (spores). The median is:
A. 70.5 spores(correct answer)
B. 38 spores
C. 75 spores
D. 66 spores
Answer: A.Ordered data: 34, 42, 49, 66, 75, 79, 82, 85. n = 8 is even, so the median is the mean of the 4th and 5th values = (66 + 75)/2 = 70.5.
Q5. The readings for the haemoglobin levels of 8 blood donors are 17, 13, 16, 15, 14, 16, 15, 12 (g/dl). The median is:
A. 15.1 g/dl
B. 14.5 g/dl
C. 14.8 g/dl
D. 15 g/dl(correct answer)
Answer: D.Ordered data: 12, 13, 14, 15, 15, 16, 16, 17. n = 8 is even, so the median is the mean of the 4th and 5th values = (15 + 15)/2 = 15.
Q6. The readings for the leaf counts of 10 cotton plants are 14, 15, 33, 24, 15, 14, 20, 28, 28, 28 (leaves). The median is:
A. 20 leaves
B. 24 leaves
C. 22 leaves(correct answer)
D. 14.5 leaves
Answer: C.Ordered data: 14, 14, 15, 15, 20, 24, 28, 28, 28, 33. n = 10 is even, so the median is the mean of the 5th and 6th values = (20 + 24)/2 = 22.
Q7. The readings for the bacterial counts in 10 water samples are 75, 77, 88, 74, 102, 91, 93, 63, 64, 49 (cells). The median is:
A. 96.5 cells
B. 75 cells
C. 76 cells(correct answer)
D. 77 cells
Answer: C.Ordered data: 49, 63, 64, 74, 75, 77, 88, 91, 93, 102. n = 10 is even, so the median is the mean of the 5th and 6th values = (75 + 77)/2 = 76.
Q8. The readings for the root lengths of 10 germinating maize seeds are 25, 35, 55, 50, 22, 26, 23, 33, 47, 46 (mm). The median is:
A. 24 mm
B. 33 mm
C. 35 mm
D. 34 mm(correct answer)
Answer: D.Ordered data: 22, 23, 25, 26, 33, 35, 46, 47, 50, 55. n = 10 is even, so the median is the mean of the 5th and 6th values = (33 + 35)/2 = 34.
Q9. The readings for the body masses of 10 laboratory rats are 222, 227, 256, 207, 252, 194, 212, 203, 255, 258 (g). The median is:
A. 223 g
B. 227 g
C. 224.5 g(correct answer)
D. 222 g
Answer: C.Ordered data: 194, 203, 207, 212, 222, 227, 252, 255, 256, 258. n = 10 is even, so the median is the mean of the 5th and 6th values = (222 + 227)/2 = 224.5.
Q10. Using the chapter's rank formula with interpolation, the 60th percentile of the cholesterol levels of 12 adults (168, 208, 158, 206, 196, 156, 184, 186, 206, 222, 169, 179 mg/dl) is: