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CHDA Domain 3 (Data Analysis) Questions and Answers
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CHDA Domain 3 (Data Analysis)
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CHDA Domain 3 (Data Analysis)Among the software programs listed below, the one best suited to detailed statistical
analysis of data is which of the following? - answerSPSS
Non-parametric tests such as a Kruskal-Wallis are advantageous compared to their
parametric counterparts for which of the following reasons? - answerThey require few
assumptions
Which of the following is an expression of the extent of a linear relationship between two
variables? - answerCorrelation
Your CMO has requested that you track patient satisfaction over time and in a way that
attempts to separate routine variation from true underlying changes over time. The est
tool to select from the options below is a ____. - answerStatistical process control chart
When a data analyst develops a sample selection involving the choice of every fourth
patient from each clinic schedule for each physician during the course of a three month
period, this sampling technique being used by the analyst is called which of the
following? - answerSystematic random sampling
How do you calculate range? - answerMax - Min
The type of statistical techniques used to make conclusions based on a sample are
____. - answerInferential
The mean is an appropriate statistic to use to measure which type of data? -
answerRatio (quantitative data where there is an absolute 0, there can be no negative
numerical value in ratio data (example is weight))
In a chi-squared test of independence, the test statistic is 7.23 and the alpha is .01
(critical value 6.635). What is the conclusion? - answerReject the null hypothesis (when
the test statistic is greater than your critical value)
If a health plan analyst wanted to determine if the readmissions rates for two hospitals
were statistically different, what hypothesis test should be used? - answerTwo-sample
z-test for proportions
A researcher would like to test the null hypothesis that the LOS at two hospitals are
equal. What statistical test should the researcher use in this situation? - answert-test for
means
, We want to compare the average weight of patients before and after a specialty diet is
administered. We expect the weight to decrease after administration of the diet. Which
of the following tests should be conducted to determine if the average weight for each
patient is less at the conclusion of the diet? - answerPaired t-test
The variable that may cause the change in a second variable is called the ____. -
answerIndependent variable (the variable that is used to predict is called the
independent, the outcome variable is the dependent)
If the correlation between years of experience and salary is positive, what can you
conclude about the slope of a regression line that might be fit to describe the
relationship? - answerThe slope will be positive
What are the assumptions made regarding the residuals in least squares regression? -
answerThe mean is zero, they are all independent, they are approximately normally
distributed
A sampling technique that divides the population into subsets and then selects a
random sample within each subset is called ____. - answerStratified random sampling
(groups are called strata's and they are based on criteria)
In order to increase the precision of a confidence interval and leave the confidence level
the same, the sample size must be ____. - answerLarger
If an analyst is studying the wait times at a clinic and the only list of patients available is
hard copu, which sampling technique is the easiest to use? - answerSystematic
sampling
What is the biggest problem with using mean LOS as a facility statistic? - answerIt is
influenced by outlier values
ALOS is an example of a ___. - answerDescriptive statistic
How do you calculate CMI? - answerSum(DRG weight * discharges)/Sum (discharges)
SPSS is a ____. - answerStatistical analysis software package.
How do you find proportion? - answersum of code your interested/sum of all codes
Which of the following attributes is required for a sample to be statistically valid? -
answerMust be reproducible
If an analyst divides the population into groups and randomly selects groups to make up
the sample, then the sampling technique used is? - answerCluster sampling
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