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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: 5, 7, 8, 10, 12, 15, 18, 20, what is the range? a) 15 b) 13 c) 16 d) 18 Question 2: Probability If you roll a fair six-sided die, what is the probability of rolling a number less than 3? a) 1/6 b) 1/2 c) 1/3 d) 2/3 Question 3: Sampling Methods Which sampling method involves selecting every kth element from a list to form a sample? a) Stratified sampling b) Cluster sampling c) Convenience sampling d) Systematic sampling Question 4: Hypothesis Testing If the p-value in a hypothesis test is less than the significance level, what action do you take? a) Fail to reject the null hypothesis b) Reject the null hypothesis c) Accept the null hypothesis d) Increase the sample size Question 5: Correlation If the correlation coefficient between two variables is 0, what does this imply? a) There is no relationship between the variables b) There is a perfect positive linear relationship
c) There is a perfect negative linear relationship d) The variables are not independent Question 6: Probability Distribution Which probability distribution is used to model the time until an event occurs? a) Normal distribution b) Poisson distribution c) Exponential distribution d) Binomial distribution Question 7: Confidence Intervals In a 95% confidence interval, what is the z-score if the distribution is standard normal? a) 1.96 b) 1.64 c) 2.58 d) 1.645 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 show the relationship between two continuous variables? a) Pie chart b) Histogram c) Scatter plot d) Bar chart Question 10: Measures of Dispersion
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