Use this set-up for Problems 53-56: A Quinnipiac poll perfor…

Use this set-up for Problems 53-56: A Quinnipiac poll performed on January 28-February 1, 2021 asked Americans, “Are you willing to get a COVID-19 vaccine, or not?” 30% of respondents said they were not. You wonder whether this proportion has changed in the past few years, so you conduct a poll of 100 Americans and ask the same question. 25 people in your sample were unwilling to get the COVID-19 vaccine. Suppose you set . What hypotheses should you set-up to determine if the percentage has changed since the initial poll?

Data set: systolic blood pressures of 20 randomly selected p…

Data set: systolic blood pressures of 20 randomly selected patients at a blood bank 135     120     115     132     136     124     119     145       98     110 125     120     115     130     140    105     116     121     125     108 Find the sample standard deviation for the data set.  Round to 2 decimal places.