EXSC 320 Exam 2
A researcher is attempting to predict upper body strength using body weight. Which of the following is true? (select all that apply) A. Upper body strength is criterion (DV) B. Upper body strength is predictor (IV) C. Researcher will have to calculate regression equation
A and C
In a multiple regression, one is able to predict...
two or more criteria from one predictor (x)
What is the mode(s) for the following set of numbers? 5,10,4,1,4,5,12,8,9,4
4
What is the median score for the following numbers: 3,11,8,13,5,3,6
6
Which of the following is NOT considered a standard score? t-score, interquartile deviation, percentiles, z-score
Interquartile deviation
Skinfolds are often used in multiple regression equations to estimate body fat. To what does multiple regression equation refer to?
More than 1 predictor variable is used to predict criterion variable
The single score which best represents all the scores in a distribution is the definition of _____ _____
central tendency
The statistic that looks at how scores vary around the median is called the _____ _____
interquartile deviation
If a researcher is collecting temperature data in degrees (F), what level of measurement is that data?
interval
If two measures have a high positive correlation and a person has a low score on one measure, his score on the other measure will most likely be _____
low
The square of the correlation coefficient indicates...
percentage of shared or common variance
In a scatter plot, the data shows the y values increasing as the x values also increase. What could the researcher assume?
positive relationship
When the majority of the scores are shown to be at the lower end of the scale with few scores at the upper end of the data is considered to be _____ _____
positively skewed
A researcher wants to determine if there is a significant relationship between height and stride length. What level of measurement is height?
ratio
The standard deviation represents the...
spread of the scores around the mean
Which of the following terms least belongs with the others: mean, median, mode, standard deviation
standard deviation
If there is a negative relationship between two physical measures...
the value of one measure increases as the value of the other measure decreases
Which of the following correlation coefficients reflects the greatest relationship? 0.12, 0.98, 0.58, 0.93, 1.12
0.98
Which of the following statements regarding alpha is correct? A. It represents what an acceptable amount of error is B. We generally use an alpha of 0.05 C. As the alpha decreases, the critical value increases D. As alpha decreases, it becomes easier to find significance
D
True/False: A correlation of +0.80 is just as strong as a correlation of -0.80
True
A researcher wants to determine if there is a significant relationship between height and stride length. What type of statistical analysis does the researcher use?
correlation
What does a correlation coefficient describe about the relationship between 2 variables?
direction & strength
When a researcher states that a result is significant, this means that...
it is reliable
The term that describes heterogeneous scores within a distribution is ______
platokurtic
Term that describes the position of the hump in the curve (left to right on the x-axis) of a distribution is _________
skewness
P > 0.05 indicates that...
the relationship is not significant