Question

Scenario C: A team of health sciences students decided on a project that would give them experience with their statistical analysis skills as well as some practice in taking vital signs. They assembled a group of 40 undergraduate students, 20 science majors and 20 majors in other fields of study, brought them to a makeshift clinic in the science building and measured their blood pressures with a hand-held BP cuff.
What type of study is this?
What is the independent variable in this scenario, and what type is it? What is the dependent variable in this scenario, and what type is it?
What is the most appropriate measure of association to compare the systolic blood pressures between the two student groups?
What is the most appropriate statistical test to test the significance of this measure of association?
The science majors’ SBPs were: 100, 110, 116, 120, 122, 128, 128, 128, 130, 132, 132, 134, 140, 144, 146, 146, 150, 152, 154, 158. The other majors’ SBPs were: 112, 118, 120, 126, 130, 130, 130, 130, 140, 142, 144, 144, 146, 150, 158, 160, 170, 170, 172, 190. First calculate the appropriate measure of association. Then, test it statistically using the on-line tool found at http://studentsttest.com/. What are the results?
What do the results mean?

Answer 1

What type of study is this? observational

What is the dependent variable in this scenario,

the systolic blood

and what type is it?

continuous

What is the independent variable in this scenario,

The two groups of undergradiate students

and what type is it?

continuous

the most appropriate measure of association to compare the systolic blood pressures between the two student groups is correlation coefficient

What is the most appropriate statistical test to test the significance of this measure of association is test for correlation coefficient

The test statistic

where r is the sample correlation and n is the sample size

the null hypothesis

it means no association between the variables

Alternative hypothesis

it means there exists association

sample correlation coefficient (r) berween variables =0.9603464

the test statistic is

the crittical value at 0.05 level of significance is

As t>t_0.025;18 we would reject the null hypothesis.

What do the results mean?

Association is present berween the variables.

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