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Statistics

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Apr 3, 2024

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Statistics Exam Quiz Question 1: Descriptive Statistics Given the dataset: 8, 10, 12, 14, 16, 18, 20, what is the median? a) 12 b) 14 c) 16 d) 18 Question 2: Probability If you flip a fair coin three times, what is the probability of getting exactly two heads? a) 1/8 b) 3/8 c) 1/4 d) 1/2 Question 3: Sampling Methods Which sampling method involves selecting individuals based on a predetermined sequence or pattern? a) Simple random sampling b) Convenience sampling c) Stratified sampling d) Systematic sampling Question 4: Hypothesis Testing What does the p-value represent in hypothesis testing? a) The probability of observing the given sample data, assuming the null hypothesis is true b) The probability of rejecting the null hypothesis c) The probability of committing a Type I error d) The probability of accepting the null hypothesis Question 5: Correlation If the correlation coefficient between two variables is 0.25, what does this suggest about their relationship? a) There is a strong positive linear relationship b) There is a moderate positive linear relationship

c) There is a weak positive linear relationship d) There is no linear relationship Question 6: Probability Distribution Which probability distribution is used to model the number of occurrences of an event within a fixed interval of time or space? a) Normal distribution b) Poisson distribution c) Binomial distribution d) Exponential distribution Question 7: Confidence Intervals In a 95% confidence interval for the population mean, what is the z-score if the distribution is standard normal? a) 1.96 b) 2.33 c) 2.58 d) 1.645 Question 8: Regression Analysis In regression analysis, what does the intercept represent? a) The predicted value of the dependent variable when all independent variables are zero b) The average change in the dependent variable for a one-unit change in the independent variable c) The strength of the relationship between the independent and dependent variables d) The variability in the dependent variable not explained by the independent variable Question 9: Data Visualization Which type of plot is used to display the distribution of a single continuous variable? a) Pie chart b) Histogram c) Scatter plot d) Bar chart Question 10: Measures of Dispersion

Which measure of dispersion is robust to outliers? a) Range b) Standard deviation c) Interquartile range d) Variance

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