Data values that do not fit the pattern of the rest of the data are:
considered outliers
A strong correlation (>0.85) between the independent
... [Show More] variables that you want to include in one multivariate linear regression model is an indication that which assumption has been violated?
multicolinearity
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Commonly used techniques of presenting and organizing statistical data include:
Descriptive statistics, graphical displays, and frequency distributions
A survey where 0=Depressed after 15 hrs, 1=Depressed after 10 hrs, 2=Depressed after 5 hrs, and 3=No change is what type of scale?
Interval scale
The set of probabilities associated with each possible outcome in the sample space is referred to as:
probability distribution
A null hypothesis was not rejected, and later it was found that the results were false is what type of error?
Type II
One of the important benefits of multivariate regression over many other statistical tests is that it:
allows you to adjust for potentially confounding variables
A research project that follows the participants forward in time to identify future outcomes is referred to as:
a cohort study
In a study looking at the correlation between annual income and cholesterol level, one concern was that the age of the participants might be a confounder because both income and cholesterol generally increase with age. Which correlation method could the researchers use to remove the influence of age?
Partial correlation
Statistics use distinct symbols to represent specific information. Parameters are usually represented by:
lowercase Greek letters
Researchers conducting a study with ____ power have a ____ probability of committing a type ___ error
low; high; II
The ____ of any statistical test represents the probability that the results were obtained by chance alone
p-value
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A multivariate regression model looking at the association of intraocular pressure with having 1) having seasonal allergies 2) wearing contact lenses 3) using eye drops found a coeffiecient of determination (r2) of 0.23. How would you interpret this statistic?
Seasonal allergies, contact lenses, and eye drop use taken together explain 23% of the variation in intraocular lens pressure
A local health dept is interested in determining if there is a difference in the incidence of childhood caries among children living in rural areas drinking untreated well water and children living in cities drinking fluorinated water. A null hypothesis could read
the oral health of the rural children will not differ from that of the city children
A potential mistake when interpreting the data is to reject the H0 when it is true. This is referred to as
a Type I error
Researchers articulate the expected relationships between the variables by the _______
null hypothesis
The study plan hypotheses
must be very specific
The _____ of a test is the probability that the test result and the diagnosis agrees
efficiency
What BMI would you predict from this equation for someone age 25 years who works 45 hours per week?
Y = -3.95 + 0.04(hours worked) + 1.21(age)
28.1
A pain intensity scale is what type of scale?
Ordinal scale
One response to the nursing shortage has resulted in the recruitment of nurses with various education levels. The results of one research study found that the level of nursing education is critical in caring for certain patients. Therefore, we can conclude that:
increasing the number of nurses without concern for educational level has serious implications for critically ill patients
The researcher has determined the project has an alpha=0.05. This indicates all values outside _____ will be rejected
95% [Show Less]