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Apr 3, 2024

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Statistics Exam Quiz Question 1: Descriptive Statistics Given the dataset: 12, 14, 15, 18, 20, what is the mean? a) 14 b) 15 c) 16 d) 17 Question 2: Probability If you roll a fair six-sided die, what is the probability of rolling a number greater than 4? a) 1/2 b) 1/3 c) 1/6 d) 2/3 Question 3: Sampling Methods Which sampling method involves dividing the population into non- overlapping subgroups and then randomly selecting individuals from each subgroup? a) Simple random sampling b) Cluster sampling c) Stratified sampling d) Systematic sampling Question 4: Hypothesis Testing What is the critical value for a one-tailed hypothesis test with a significance level of 0.05 and degrees of freedom equal to 20? a) ±1.645 b) ±1.96 c) ±1.729 d) ±2.086 Question 5: Correlation If the correlation coefficient between two variables is 0.20, what does this suggest about their relationship?
a) There is a weak positive linear relationship b) There is a strong positive linear relationship c) There is a weak negative linear relationship d) There is no 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 is the z-score if the distribution is standard normal? a) 2.33 b) 2.58 c) 2.81 d) 1.96 Question 8: Regression Analysis In linear regression, 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) Bar chart d) Scatter plot
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