Exploratory Data Analysis Quiz

What is the primary purpose of Exploratory Data Analysis (EDA)?

• To perform formal hypothesis testing

• To ensure data meets parametric test assumptions

• To create visualizations for data presentation

• To collect raw data from experiments

Which of the following is a common example of a parametric test in microbiology?

• ANOVA

• Kruskal-Wallis test

• Mann-Whitney U test

• Chi-square test

What does the 68-95-99.7 Rule describe?

• The steps for conducting a t-test

• The process of data transformation

• The requirements for non-parametric tests

• The likelihood of data falling within specific standard deviations

What is the null hypothesis (H0) in the Shapiro-Wilk Test?

• The data is drawn from a normal distribution

• The data has equal variances

• The data is skewed

• The data contains outliers

Which statistical test is used to assess homogeneity of variance?

• Mann-Whitney U test

• ANOVA

• Levene's Test

• Shapiro-Wilk Test

What does a significant result (p < 0.05) in Levene's Test indicate?

• The sample size is too small

• The data is normally distributed

• There is a problem with homogeneity of variance

• The variances across groups are equal

What is the effect of transforming non-normal data?

• It ensures data is collected accurately

• It eliminates outliers from the dataset

• It modifies the data to fit a normal distribution

• It increases the sample size

Which of the following is NOT a characteristic of a normal distribution?

• Bell curve

• Presence of multiple modes

• Skewness of zero

• Symmetrical shape

What does skewness measure in a data distribution?

• The asymmetry of the data distribution

• The spread of the data

• The number of outliers present

• The average value of the data

In a QQ plot, what does a straight line pattern indicate?

• Data is heavily skewed

• Data contains many outliers

• Data is uniformly distributed

• Data likely follows a normal distribution