#1
What does a negative correlation coefficient indicate between two variables?
A strong negative correlation
ExplanationStrong negative correlation
#2
In a normal distribution, what percentage of data falls within one standard deviation from the mean?
68%
ExplanationPercentage of data within one standard deviation
#3
Which of the following is a measure of central tendency?
Median
ExplanationMeasure of central tendency
#4
What is the Pearson correlation coefficient used for?
Measuring the strength of a linear relationship between two variables
ExplanationMeasuring linear relationship strength
#5
In statistics, what does p-value represent in hypothesis testing?
Probability of observing the data given that the null hypothesis is true
ExplanationProbability of data given null hypothesis
#6
Which statistical test is appropriate for comparing the means of two independent groups?
Analysis of Variance (ANOVA)
ExplanationComparing means of independent groups
#7
What does the term 'statistical significance' mean in the context of hypothesis testing?
The likelihood of obtaining the observed result by chance
ExplanationLikelihood of result by chance
#8
Which type of correlation coefficient is appropriate for ordinal data?
Spearman's rank correlation coefficient
ExplanationCorrelation for ordinal data
#9
What is the purpose of a box plot in statistical analysis?
To display the distribution of a dataset
ExplanationDisplaying dataset distribution
#10
What is the range of the correlation coefficient values?
-1 to 1
ExplanationRange of correlation coefficient
#11
What is the purpose of the coefficient of determination (R-squared) in regression analysis?
To assess the goodness of fit of the regression model
ExplanationAssessing goodness of fit in regression
#12
What is the purpose of a covariance in statistics?
To quantify the degree of joint variability between two variables
ExplanationQuantifying joint variability
#13
What is the primary purpose of a correlation matrix in statistical analysis?
To examine the relationships between multiple variables
ExplanationExamining relationships between variables
#14
What is the primary goal of cluster analysis in statistics?
To identify patterns and group similar observations together
ExplanationIdentifying patterns and grouping observations
#15
Which type of correlation coefficient is suitable for categorical data?
Point-biserial correlation coefficient
ExplanationCorrelation for categorical data