# mathematics

A study of 20 college students was conducted to see how many adults would have low bone mineral density, even at a younger age. Investigators wish to know what is the probability of having a bone mineral density score less than 2 units below the unknown mean bone mineral density (BMD) of the general college population country-wide. The standard deviation was measured to be 6.

Select one:

a. 0.57

b. 0.12

c. 0.07

d. 0.15

A study has been designed for two schools in IL to examine whether the BMI and fasting blood glucose for students in one schools is different than that for the other school. All students in each school will participate. This study is an example of what type of sampling technique?

Select one:

a. random

b. cluster

c. convenience

Gender, disease status, alive or dead . . . these are examples of what type of variable?

Select one:

a. Continuous Variables

b. Ordinal Variables

c. Dichotomous Variables

d. Categorical Variables

All of the patients at a sleep clinice were enrolled in a study. For the control population, family members and friends of the patients were asked to participate as well. The study aims to examine whether there are differences in biometric measures between the sleep clinic patients and this control population of friends and family. This study is an example of what type of sampling technique?

Select one:

a. random

b. cluster

c. convenience

A research study wishes to examine the proportion of hypertensive individuals among three different groups of exercises: marathon runners, yoga, and CrossFit. Of the 78 marathon runners, 14 are hypertensive. Of the 63 yoga practioners, 6 are hypertensive. And there are 16 hypertensive subjects among the 54 CrossFit athletes. What is the critical value for the test statistic? (e.g. what number are you hoping to beat in order to show a significant finding)

Select one:

a. 1.96

b. 1.65

c. 5.99

d. 4.83

Age, income, height, weight, blood pressure . . . these are examples of what type of variable?

Select one:

a. Continuous Variables

b. Ordinal Variables

c. Dichotomous Variables

d. Categorical Variables

A research study of 15 children with a diagnosis of ADHD wish to assess whether the BMI of the children is correlated with degrees of hyperactivity in the child. The BMI of the 15 children in a study: 22, 23, 25, 24, 18, 27, 26, 29, 28, 31, 32, 28, 33, 28, 34. What is the standard deviation of the children?

Select one:

a. 5.21

b. 3.78

c. 4.42

d. 6.03

A clinical trial investigating a new cholesterol-lowering medication aims to identify whether it is any more effective than the current market favorite drug. This type of study uses what kind of statistics:

Select one:

a. Descriptive

b. Inferential

A study sample was recruited to examine whether a smoking cessation program may be successful in the population. Of the 1200 individuals that were surveyed, 365 classified themselves as smokers. What is the 95% confidence interval for this study?

Select one:

a. (0.17,0.28)

b. (0.16,0.24)

c. (-0.16,-0.24)

d. (0.25,0.29)

e. (0.28,0.33)

There are 5290 children in a study. There are 2560 boys and 2730 girls. Of the 2560 boys, there are 432 five year olds, 379 six year olds, 501 seven year olds, 410 eight year olds, 420 nine year olds, 418 ten year olds. Of the 2730 girls, there are 408 five year olds, 513 six year olds, 412 seven year olds, 436 eight year olds, 461 nine year olds, 500 ten year olds. Of the whole population of boys and girls, there are 840 five year olds, 892 six year olds, 913 seven year olds, 846 eight year olds, 881 nine year olds, 918 ten year olds. What is the probability of selecting a boy who is 5, 6, or 7 years old?

Select one:

a. 16.9%

b. 24.8%

c. 32.1%

d. 51.3%

A research study wishes to examine the mean resting heart rate for 16 individuals among four different groups of exercises (evenly distributed to 4 individuals per group). What type of test statistic do you need to run for this type of analysis?

Select one:

a. Chi-Square Test of Independence

b. Chi-Square Goodness of Fit

c. Z-test

d. T-test

e. F-test

A research study wishes to examine the mean resting heart rate for 16 individuals among four different groups of exercises (evenly distributed to 4 individuals per group). The sum of the variability between groups is 792.69 and the sum of the variability within a group (error) is 207.75. Calculate the test statistic.

Select one:

a. 13.68

b. 14.55

c. 15.26

d. 15.98

When the AIDS epidemic first broke out, a series of cases were published regarding rare syndromes and diseases not usually seen in the general population. These case studies included symptoms, dates, and general background information on the patients including gender, age, and ethnicity. This type of study uses what kind of statistics:

Select one:

a. Descriptive

b. Inferential