model exam data analytics

What is the main difference between a parameter and a statistic in statistics?

• A statistic is a population measure

• A statistic is a sample measure

• A parameter is a sample measure

• A parameter is a variable

What is the purpose of sampling distribution?

• To estimate population variance

• To estimate sample size

• To analyze variance within a sample

• To estimate the distribution of a sample statistic

Which of the following is a characteristic of a normal distribution?

• Skewed left

• Bell-shaped curve

• Non-symmetrical

• Skewed right

A confidence interval is used to estimate the…

• Exact value of a sample statistic

• Range of values in a dataset

• Population parameter with a degree of uncertainty

• Probability of a specific event occurring

What does the expected value of a random variable represent?

• The most probable outcome

• The average of all possible outcomes

• The range of all outcomes

• The variance of all possible outcomes

Which of the following describes the relationship between variance and standard deviation?

• Standard deviation is the square of the variance

• Standard deviation is the square root of the variance

• Variance is the square of the standard deviation

• Variance and standard deviation are unrelated

What is the meaning of correlation in data analysis?

• A measure of central tendency

• A measure of association between two variables

• A measure of data dispersion

• A measure of data normality

What is the primary purpose of hypothesis testing?

• To describe data

• To estimate parameters

• To test the significance of sample data

• To calculate correlations between variables

Which statistical test is used for determining the significance of a hypothesis?

• t-test

• ANOVA

• Z-test

• All of the above

How do descriptive statistics summarize data?

• By predicting future trends

• By testing hypotheses

• By organizing and presenting data visually

• By calculating the correlation between variables