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Indiana University, Bloomington *

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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: 10, 12, 15, 18, 20, what is the mean? a) 13 b) 15 c) 16 d) 17 Question 2: Probability If you draw a card from a standard deck of 52 cards, what is the probability of drawing a red card? a) 1/2 b) 1/4 c) 1/3 d) 1/5 Question 3: Sampling Methods Which sampling method involves selecting individuals who are easily accessible or readily available? a) Simple random sampling b) Convenience sampling c) Stratified sampling d) Cluster sampling Question 4: Hypothesis Testing What is the null hypothesis typically denoted as in hypothesis testing? a) H1 b) H0 c) Ho d) Ha Question 5: Correlation If the correlation coefficient between two variables is -0.50, what does this suggest about their relationship? a) There is a moderate positive linear relationship b) There is a moderate negative linear relationship c) There is no linear relationship d) There is a strong negative linear relationship

Question 6: Probability Distribution Which probability distribution is used to model the number of successes in a fixed number of independent trials with a constant probability of success? a) Normal distribution b) Poisson distribution c) Binomial distribution d) Exponential distribution Question 7: Confidence Intervals In a 99% confidence interval for the population mean, what z-score is used if the distribution is standard normal? a) 1.96 b) 2.33 c) 2.58 d) 2.81 Question 8: Regression Analysis What does the coefficient of determination (R-squared) measure in regression analysis? a) The proportion of the total variation in the dependent variable explained by the independent variable 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 intercept of the regression line Question 9: Data Visualization Which type of plot is used to display the relationship between two continuous variables? a) Histogram b) Scatter plot c) Bar chart d) Line chart Question 10: Measures of Dispersion Which measure of dispersion is not affected by extreme values in a dataset? a) Range b) Standard deviation c) Interquartile range d) Variance

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