Test on Percentage Change and Percentiles in Biology
Percentage Change & Percentiles in Biology Explained
Test: Data comparison and statistics
20 questions
Question 1: When using percentiles to understand data spread, focusing on the range between the 10th and 90th percentiles will always include all outlying results.
A. Ano
B. Ne
Explanation: By finding the range between the 10th and 90th percentiles in a data set, one can look at the spread of the data while ignoring any outlying results. This means it does not include all outlying results.
Question 2: In the provided example, the potato cylinder in the 0.0 mol/dm³ sugar solution experienced the largest percentage change.
A. Ano
B. Ne
Explanation: The study materials show that the potato cylinder in the 0.0 mol/dm³ sugar solution had a percentage change of 16% ((8.7 - 7.5) / 7.5 * 100). The potato cylinder in the 1.0 mol/dm³ sugar solution had a percentage change of -15% ((6.8 - 8.0) / 8.0 * 100). Comparing these values, 16% is greater than 15%, indicating the largest percentage change for the potato cylinder in the 0.0 mol/dm³ sugar solution.
Question 3: Percentiles can provide a more realistic understanding of data spread compared to the range by ignoring outlying results.
A. Ano
B. Ne
Explanation: The study materials indicate that percentiles can be used to give a more realistic idea of the spread of data than the range, particularly by focusing on the range between percentiles like the 10th and 90th, which allows for ignoring outlying results.
Question 4: To calculate percentage change, the formula divides the original value by the difference between the final value and the original value, and then multiplies by 100.
A. Ano
B. Ne
Explanation: The percentage change formula is (final value - original value) / original value × 100. It divides the difference between the final and original value by the original value, not the other way around.
Question 5: When finding a percentile, data is divided into ten equal chunks, with each chunk representing one percentile.
A. Ano
B. Ne
Explanation: To find a percentile, data is ranked from smallest to largest and then divided into one hundred equal chunks, with each chunk representing one percentile.