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

• It is skewed to the right.

• It has multiple modes.

• It is symmetric about the mean.

• It touches the x-axis at two points.

In statistics, what term describes a characteristic or attribute that can assume different values?

• Data

• Variable

• Sample

• Population

What is the term for the values (measurements or observations) that variables can assume?

• Data

• Sample

• Population

• Parameter

Which type of statistics involves generalizing from samples to populations and making predictions?

• Descriptive statistics

• Inferential statistics

• Qualitative statistics

• Quantitative statistics

Variables that have distinct categories based on some characteristic or attribute are known as:

• Quantitative variables

• Qualitative variables

• Discrete variables

• Continuous variables

Which level of measurement classifies data into mutually exclusive categories without any order or ranking?

• Nominal

• Ordinal

• Interval

• Ratio

In a normal distribution, what does the z-value represent?

• The mean of the distribution

• The median of the distribution

• The number of standard deviations a particular X value is away from the mean

• The mode of the distribution

According to the Central Limit Theorem, as the sample size increases, the shape of the distribution of the sample means will approach a:

• Uniform distribution

• Normal distribution

• Binomial distribution

• Poisson distribution

What is the term for the difference between the sample measure and the corresponding population measure due to the fact that the sample is not a perfect representation of the population?

• Sampling error

• Measurement error

• Standard error

• Random error

Which level of measurement possesses all the characteristics of interval measurement, and there exists a true zero?

• Nominal

• Ordinal

• Interval

• Ratio