5. A clinical trial is planned to compare an experimen- tal medication designed to lower blood pressure to a placebo. Before starting the trial, a pilot study is con- ducted involving seven participants. The objective of the study is to assess how systolic blood pressure changes over time untreated. Systolic blood pressures are measured at baseline and again 4 weeks later. Is there a statistically significant difference in blood pressures over time? Run the test at a 5% level of sig- nificance. Baseline 120 145 130 160 152 143 126 4 weeks 122 142 135 158 155 140 130

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Matrices

‘Matrices’ is the plural form of the word matrix, and it is basically a spreadsheet in the form of a box. In mathematics, various functions can be carried out with matrices. Generally, a matrix comes in the shape of a square or rectangle. The elements are distributed horizontally in the form of rows, and vertically in the form of columns.