ងាយៗ

Which of the following measures of central tendency is most affected by outliers?

• Mean

• Median

• Mode

• Range

• Standard deviation

Which descriptive statistic provides a measure of the spread or variability of a dataset?

• Mean

• Median

• Mode

• Quartile

• Standard deviation

  A distribution is said to be positively skewed if:

• The mean is equal to the median

• The mean is less than the median.

• .  The mean is greater than the median

• The mode is greater than the mean

• The mode is less than the mean

  A box plot, also known as a box-and-whisker plot, visually displays which of the following descriptive statistics?

• Mean, median, and mode

• Range, standard deviation, and variance

• Frequency, relative frequency, and cumulative frequency

• Correlation coefficient and coefficient of determination

• Minimum, maximum, quartiles, and outliers

Which of the following is a measure of the strength and direction of the linear relationship between two variables?

• Mean

• Median

• Mode

• Range

• Correlation coefficient

A correlation coefficient of r = -0.85 indicates:

• A strong positive linear relationship

• A weak positive linear relationship

• No linear relationship

• A weak negative linear relationship

• A strong negative linear relationship

Which of the following is the primary goal of linear regression analysis?

• .  To determine the correlation coefficient between two variables

• To model the relationship between a dependent variable and one or more independent variables

• To test for significant differences between means of two or more groups

•   To predict the probability of an event occurring

• To create a visual representation of the distribution of a dataset

Which of the following statistical tests is used to compare the means of three or more independent groups?

• Independent samples t-test

• Paired samples t-test

• Chi-square test

• One-way ANOVA

• Correlation analysis

Which of the following is NOT an assumption of one-way ANOVA?

• Independence of observations

• Normality of the distribution of the dependent variable within each group

• Homogeneity of variances across groups

• Ordinal or interval level of measurement for the independent variable

• Random sampling from the populations of interest

If the p-value obtained from a one-way ANOVA is less than the significance level (e.g., 0.05), what does this suggest about the group means?

• There is a significant difference between at least two group means

• There is a significant difference between at least two group variances

• The group means are all equal

• The analysis is inconclusive

• The data is not normally distributed