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WGU C784 APPLIED HEALTHCARE STATISTICS 2024 ACTUAL EXAM 100 QUESTIONS WITH DETAILED ANSWERS
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WGU C784 APPLIED HEALTHCARE STATISTICS 2024 ACTUAL EXAM 100 QUESTIONS WITH DETAILED ANSWERS
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WGU C784 APPLIED HEALTHCARE STATISTICS 2024 ACTUALEXAM 100 QUESTIONS WITH DETAILED ANSWERS
1. What is the primary purpose of descriptive statistics?
o A) To summarize data
o B) To make inferences about a population based on a sample
o C) To describe the central tendency and variability of
data
o D) To test hypotheses
2. Which of the following measures is not a measure of central
tendency?
o A) Standard deviation
o B) Mean
o C) Median
o D) Mode
3. What does a p-value represent in hypothesis testing?
o A) The probability of observing the data, or something
more extreme, if the null hypothesis is true
o B) The probability that the null hypothesis is true
o C) The probability that the alternative hypothesis is true
o D) The probability of a Type I error
4. Which of the following is an example of a continuous variable?
o A) Gender
o B) Height
o C) Marital status
o D) Eye color
5. In a normal distribution, what percentage of the data falls
within one standard deviation of the mean?
o A) 50%
o B) 68%
o C) 95%
o D) 99.7%
6. What is the main difference between a histogram and a bar
chart?
, o A) A histogram is used for continuous data, while a bar
chart is used for categorical data
o B) A histogram is used for categorical data, while a bar chart
is used for continuous data
o C) Histograms show frequencies, while bar charts show
percentages
o D) There is no difference; they are the same
7. Which of the following best describes a Type II error?
o A) Rejecting the null hypothesis when it is true
o B) Failing to reject the null hypothesis when it is false
o C) Rejecting the alternative hypothesis when it is true
o D) Accepting the alternative hypothesis when it is false
8. What does the correlation coefficient measure?
o A) The difference between two means
o B) The strength and direction of the relationship between
two variables
o C) The variance within a dataset
o D) The probability of a Type I error
9. What is the purpose of a confidence interval?
o A) To estimate the range within which a population
parameter lies based on a sample statistic
o B) To determine the exact value of a population parameter
o C) To test the validity of the null hypothesis
o D) To measure the correlation between two variables
10. Which of the following sampling methods is considered
the most representative of a population?
o A) Convenience sampling
o B) Random sampling
o C) Snowball sampling
o D) Quota sampling
11. What does a positive skew in a dataset indicate?
o A) The mean is less than the median
o B) The data is evenly distributed
o C) The tail is longer on the right side of the distribution
, o D) The mean is greater than the median
12. Which statistical test would you use to compare the
means of two independent groups?
o A) Chi-square test
o B) Independent samples t-test
o C) ANOVA
o D) Paired samples t-test
13. In regression analysis, what does the coefficient of
determination (R²) indicate?
o A) The slope of the regression line
o B) The proportion of variance in the dependent variable
explained by the independent variable(s)
o C) The correlation between the dependent and independent
variables
o D) The error term in the regression model
14. Which of the following is not an assumption of
parametric tests?
o A) The data is normally distributed
o B) The data is measured at an interval or ratio level
o C) The sample size is less than 30
o D) Homogeneity of variances
15. What is the purpose of a scatterplot?
o A) To visualize the relationship between two continuous
variables
o B) To display the frequency distribution of a single variable
o C) To compare the means of more than two groups
o D) To show the proportion of categories in a dataset
16. Which of the following describes a null hypothesis?
o A) A statement that there is a significant effect
o B) A statement that there is a correlation between variables
o C) A statement that there is no effect or no difference
o D) A statement that the research hypothesis is true
17. What is the main purpose of inferential statistics?
o A) To describe the main features of a dataset
o B) To make generalizations from a sample to a population
, o C) To calculate measures of central tendency
o D) To visualize data distributions
18. Which of the following best describes the term 'standard
error'?
o A) The standard deviation of the population
o B) The standard deviation of the sampling distribution of
a statistic
o C) The mean of the population
o D) The mean of the sample
19. What does a confidence level of 95% mean in the context
of a confidence interval?
o A) There is a 95% chance that the interval contains the
population parameter
o B) 95% of the sample data falls within the interval
o C) The population parameter is 95% likely to fall outside the
interval
o D) The sample mean is 95% accurate
20. Which of the following is a non-parametric test?
o A) ANOVA
o B) Mann-Whitney U test
o C) Pearson correlation
o D) Linear regression
21. What is the primary purpose of a box plot?
o A) To show the distribution of a dataset
o B) To compare the means of multiple groups
o C) To display the median, quartiles, and outliers of a
dataset
o D) To illustrate the correlation between two variables
22. Which of the following is an example of a nominal
variable?
o A) Age
o B) Blood type
o C) Weight
o D) Income
23. What does the term 'bias' refer to in statistical analysis?
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