Statistics Quiz

Which of the following is a measure of central tendency?

• Mean

• Standard Deviation

• Median

• Skewness

What does variance measure in a dataset?

• The average value

• The spread of data around the mean

• The symmetry of the data

• The steepness of the data distribution

What does skewness indicate in a dataset?

• Spread of data

• Symmetry of the data distribution

• Range of the data

• Relationship between variables

Inferential statistics involve which of the following?

• Summarising data

• Predicting characteristics of a population

• Calculating the range

• Creating scatter plots

What is the null hypothesis (H₀) in hypothesis testing?

• A statement that there is an effect or difference

• A statement that there is no effect or difference

• A method to summarise data

• The range of values in a dataset

If the p-value in a hypothesis test is less than 0.05, what does this indicate?

• Fail to reject the null hypothesis

• Reject the null hypothesis

• The test is invalid

• The data is symmetrical

What does a confidence interval represent?

• The range of possible population means

• The exact population mean

• A measure of data spread

• The central value in a dataset

Which of the following steps are required to calculate a 95% confidence interval in Excel?

• Calculate the mean

• Calculate the variance

• Calculate the standard error

• Add and subtract the margin of error from the mean

In the linear regression formula y=mx+c, what does m represent?

• Intercept

• Slope

• Dependent variable

• Independent variable

What does the R-squared value in a regression analysis indicate?

• The strength of the fit between the line and the data

• The slope of the regression line

• The predicted value of the dependent variable

• The y-intercept of the regression line