Week 4 Data Analytics in Healthcare Quiz

What is the purpose of the chi-squared test?

• • To test the relationship between two categorical variables

• • To compare means between two groups

• • To measure the strength of a correlation

• • To determine the variance within a dataset

What does the null hypothesis (H₀) represent in hypothesis testing?

• • The hypothesis that there is a significant effect

• • The hypothesis that there is no effect or no difference

• • The hypothesis that the sample data is not representative of the population

• • The hypothesis that there is a correlation between variables

If a p-value is less than 0.05, what decision should be made about the null hypothesis?

• • Accept the null hypothesis

• • Reject the null hypothesis

• • Fail to reject the null hypothesis

• • Accept the alternative hypothesis

What is the primary purpose of an ANOVA test?

• • To test for independence between two categorical variables

• • To test for differences between the variances of two samples

• • To compare the means of three or more groups

• • To measure the correlation between two variables

In ANOVA, what does a significant F-statistic indicate?

• • At least one group mean is different from the others

• • The variances of the groups are equal

• • All group means are equal

• • There is no significant difference between the group means

What information is displayed in a scatterplot?

• • Frequency distribution of a single variable

• • Summary statistics of a dataset

• • Relationship between two continuous variables

• • Distribution of a categorical variable

Which pattern in a scatterplot indicates a positive correlation?

• • Points are scattered randomly

• • Points form an upward slope from right to left

• • Points form an upward slope from left to right

• • Points are clustered along a horizontal line

What does the box in a boxplot represent?

• • The interquartile range (IQR)

• • The mean and standard deviation of the data

• • The overall range of the data

• • The mode and median of the data

Which of the following best describes a skewed histogram?

• • A histogram with symmetrical bars

• • A histogram where the bars are higher on one side than the other

• • A histogram with bars of equal height

• • A histogram with only one bar

Which graph is most appropriate to visualize the distribution of a categorical variable?

• • Scatterplot

• • Boxplot

• • Histogram

• • Bar chart