#1
What is the median of the following dataset: 12, 15, 18, 20, 25, 30, 35?
#2
What does the term 'p-value' stand for in statistics?
Probability value
Precision value
Predictive value
Performance value
#3
What does the term 'skewness' refer to in statistics?
The symmetry of the distribution
The peak of the distribution
The spread of the distribution
The lack of symmetry in the distribution
#4
Which of the following is a measure of relative standing in a dataset?
Standard deviation
Median
Interquartile range
Range
#5
Which statistical distribution is commonly used to model continuous random variables?
Binomial distribution
Poisson distribution
Normal distribution
Exponential distribution
#6
What is the standard deviation of the following dataset: 5, 10, 15, 20, 25, 30?
#7
What is the mode of the following dataset: 3, 5, 5, 7, 7, 7, 9, 9, 11?
#8
Which measure of central tendency is affected most by outliers?
#9
Which graphical representation is used to display the relationship between two continuous variables?
Histogram
Box plot
Scatter plot
Bar chart
#10
What is the purpose of hypothesis testing in statistical analysis?
To prove that the null hypothesis is true
To accept the alternative hypothesis
To make inferences about population parameters based on sample data
To calculate the standard deviation of a dataset
#11
In a normal distribution, what percentage of data falls within one standard deviation from the mean?
#12
What is the purpose of a histogram in statistical analysis?
To display the distribution of categorical data
To show the relationship between two continuous variables
To compare the means of two independent groups
To visualize the frequency distribution of a continuous variable
#13
In a box plot, what does the line inside the box represent?
The median
The mean
The mode
The range
#14
Which of the following statistical tests is used to determine if there is a significant difference between the means of more than two independent groups?
Chi-square test
T-test
Analysis of variance (ANOVA)
Correlation analysis
#15
What does the term 'confidence interval' represent in statistics?
The range of values within which the true population parameter is estimated to lie
The probability of observing the sample data given that the null hypothesis is true
The probability of rejecting the null hypothesis when it is actually true
The spread of data points in a dataset
#16
What is the coefficient of correlation if the correlation between two variables is perfect and positive?
#17
Which of the following statistical tests is used to compare the means of two independent groups?
Chi-square test
Analysis of variance (ANOVA)
T-test
Correlation analysis
#18
What does a p-value indicate in hypothesis testing?
The probability of observing the sample data given that the null hypothesis is true
The probability of rejecting the null hypothesis when it is actually true
The probability of accepting the null hypothesis when it is actually false
The probability of observing the sample data given that the alternative hypothesis is true
#19
What does the standard error measure in statistical analysis?
The variability of sample means around the population mean
The spread of data points in a dataset
The probability of rejecting the null hypothesis incorrectly
The confidence interval around the sample mean
#20
Which of the following measures of dispersion is least affected by outliers?
Range
Standard deviation
Interquartile range
Mean absolute deviation
#21
Which of the following is NOT a measure of association used in regression analysis?
Correlation coefficient
Coefficient of determination
F-test statistic
Adjusted R-squared
#22
What is the formula to calculate the coefficient of variation?
(Standard Deviation / Mean) * 100
(Mean / Standard Deviation) * 100
(Range / Standard Deviation) * 100
(Interquartile Range / Mean) * 100
#23
What does the term 'Type I error' represent in hypothesis testing?
Rejecting the null hypothesis when it is true
Failing to reject the null hypothesis when it is false
Rejecting the null hypothesis correctly
Accepting the alternative hypothesis incorrectly
#24
What is the formula for calculating the coefficient of determination (R-squared) in linear regression?
1 - (SSE / SST)
1 - (SSR / SST)
1 - (SST / SSR)
1 - (SST / SSE)
#25
What is the formula to calculate the z-score of a data point in a normal distribution?
(x - μ) / σ
(x - σ) / μ
(σ - μ) / x
(μ - x) / σ