A student investigated the effect of soil pH on the height of a specific plant species. They measured the heights of independent plants grown in two different areas: one with acidic soil (pH 5.5\text{pH } 5.5pH 5.5) and another with neutral soil (pH 7.0\text{pH } 7.0pH 7.0). Which of the following options is the correct procedure for the statistical analysis of the data collected by the student?
Calculate the mean height of plants in the acidic and neutral soils and use a paired t-test.
Calculate the mean height of plants in the acidic and neutral soils and use an unpaired t-test.
Calculate the median height of plants in the acidic and neutral soils and calculate Spearman's rank correlation coefficient.
Calculate the median height of plants in the acidic and neutral soils and use a chi-squared test.
45 exam-style questions on OCR A A Level Biology Analysis. Each one has a worked solution and a mark scheme showing where the marks go.