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Biostats Exam 1

Terms in this set (21)

If you have a set of scores with a range of 50 and you want 10 intervals, what should be the size of your class interval?
5
What term describes the groups that you divide your data into when creating a histogram? (choose one or more)
Class interval
Bin
Class width
Which of the following tells you how often a certain score occurs?
Frequency distribution
Given the following data for resting heart rate among college students, what is the IQR?
57, 59, 60, 62, 62, 63, 64, 68, 70, 70, 71, 71, 73, 79, 87, 89, 90
14
Choose the best set of answers to complete the following statement. According to the attached boxplot, 50% of the study sample consume between _______ and _______ fruit servings per week.
15,25
True or False, box plots are not affected by outliers.
False
Which of the following is not one of the 5 number summary?
Mean
If you were interested in tracking your GPA during the time you are in graduate school, which of the following might you use?
Line chart
Which of the following is designed to present large amounts of information quickly, and uses pictures or shapes to display the information?
Infographic
Which of the following would be appropriate to display nominal data? (choose one or more)
...
Which of the following would be appropriate to use when displaying continuous interval/ratio data? (choose one or more)
-histogram
-scatterplot
-
In a box, there are 8 red, 7 blue and 6 green balls. One ball is picked up randomly. What is the probability that it is neither red nor green?
1/3
True or False, if the probability of an event happening is 25%, then the probability of it not happening is 75%.
True
True or False, the probability of an outcome can be a negative number.
False
Probability is an important concept for researchers primarily because
researchers collect data from samples rather than populations
Mathematically, probability may be defined as
the number of ways an outcome may occur divided by the total number of possible outcomes
If there is a strong correlation between two variables (x and y) it is safe to assume that x caused y.
False
Which of the correlations is the weakest?
-0.88
0.52
0.78
-0.25
-0.25
T or F: A perfect negative correlation would be represented by Pearson's r of -1.
True
A positive correlation means that there is a strong relationship between the variables.
False
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