Suppose a researcher wants to know if the average diastolic blood pressure in Irish-Americans is different than the average diastolic blood pressure in the general population. Note that the average diastolic blood pressure in the general population is 70 mmHG. The researcher recruits 30 Irish-Americans into this particular study and then measures each of their diastolic blood pressures (mmHG). The sample standard deviation in this sample is 3.0. Note that we do not know the population

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Suppose a researcher wants to know if the average diastolic blood pressure in Irish-Americans is different than the average diastolic blood pressure in the general population. Note that the average diastolic blood pressure in the general population is 70 mmHG. The researcher recruits 30 Irish-Americans into this particular study and then measures each of their diastolic blood pressures (mmHG). The sample standard deviation in this sample is 3.0. Note that we do not know the population standard deviation (commonly denoted σ).  If we want to build a 95% confidence interval, what is the "t-value" used in the interval? Recall intervals are of the form

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