#1
What does a negative correlation coefficient indicate between two variables?
No correlation
A strong positive correlation
A strong negative correlation
A weak positive correlation
#2
In a normal distribution, what percentage of data falls within one standard deviation from the mean?
#3
Which of the following is a measure of central tendency?
Standard deviation
Variance
Median
Interquartile range
#4
What is the Pearson correlation coefficient used for?
Measuring the strength of a linear relationship between two variables
Counting the occurrences of a particular value in a dataset
Calculating the mean of a dataset
Determining the mode of a distribution
#5
In statistics, what does p-value represent in hypothesis testing?
Probability of observing the data given that the null hypothesis is true
Probability of rejecting the null hypothesis when it is true
Probability of accepting the null hypothesis when it is false
Probability of observing a random event in the data
#6
Which statistical test is appropriate for comparing the means of two independent groups?
Paired t-test
Chi-square test
Analysis of Variance (ANOVA)
Wilcoxon signed-rank test
#7
What does the term 'statistical significance' mean in the context of hypothesis testing?
The practical importance of the result
The size of the sample used
The likelihood of obtaining the observed result by chance
The consistency of the data
#8
Which type of correlation coefficient is appropriate for ordinal data?
Pearson correlation coefficient
Spearman's rank correlation coefficient
Point-biserial correlation coefficient
Kendall's tau
#9
What is the purpose of a box plot in statistical analysis?
To display the distribution of a dataset
To calculate the mean of a dataset
To identify outliers in a dataset
To perform hypothesis testing
#10
What is the range of the correlation coefficient values?
0 to 1
-1 to 1
-∞ to ∞
1 to ∞
#11
What is the purpose of the coefficient of determination (R-squared) in regression analysis?
To measure the strength of a linear relationship
To assess the goodness of fit of the regression model
To calculate the slope of the regression line
To determine the p-value of the regression equation
#12
What is the purpose of a covariance in statistics?
To measure the strength of a linear relationship between two variables
To standardize the units of measurement
To assess the goodness of fit of a regression model
To quantify the degree of joint variability between two variables
#13
What is the primary purpose of a correlation matrix in statistical analysis?
To display the distribution of a dataset
To identify outliers in a dataset
To examine the relationships between multiple variables
To calculate the mean of a dataset
#14
What is the primary goal of cluster analysis in statistics?
To compare the means of two independent groups
To identify patterns and group similar observations together
To perform hypothesis testing
To analyze the variance within a group
#15
Which type of correlation coefficient is suitable for categorical data?
Pearson correlation coefficient
Spearman's rank correlation coefficient
Point-biserial correlation coefficient
Kendall's tau