A pharmaceutical company wants to test whether taking their new anti-anxiety drug has the side effect of heightening systolic blood pressure of patients. Their researchers randomly select 11 patients who have been using the new drug and finds that their mean systolic blood pressure equals 82.6. Systolic blood pressures in the population of patients who have not used the new drug are distributed normally with a mean equal to 92.8 and a variance equal to 538.2 . Is there sufficient evidence to conclude that the new anti-anxiety drug heightens systolic blood pressure? Use a significance level of 0.05 . Step 2 of 5 : Calculate the value of the test statistic. Round your answer to two decimal places.

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