A researcher would like to know whether systolic blood pressure (a normally distributed continuous variable) is influenced by whether or not a person ate breakfast (yes/no). She collects data on patients seen for a morning physical exam at a general practitioner's office. The breakfast question is asked via the intake form. A single blood pressure reading is recorded for each participating patient. What statistical test should she conduct? Question 18 options: Independent sample t-test Chi-square or Fisher's exact Wilcoxon signed rank test Spearman correlation