IBM2 Semester 1 Extra

Front

What are the null and alternative hypotheses in hypothesis testing?

Back

The null hypothesis (H0) states that there is no effect or no difference, while the alternative hypothesis (H1) states that there is an effect or a difference.

Front

What is the significance of a normal distribution in statistics?

Back

A normal distribution is a probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean.

Front

What is the mean in a normal distribution?

Back

The mean is the average of all data points in a distribution and is the center point of a normal distribution.

Front

What does the standard deviation represent in a normal distribution?

Back

The standard deviation measures the amount of variation or dispersion of a set of values in a normal distribution.

Front

What is the formula for calculating the probability of a normally distributed variable?

Back

Front

What is a bell curve?

Back

A bell curve is the graphical representation of a normal distribution, characterized by its bell-shaped appearance.

Front

How do you calculate the population of a modelled function?

Back

To calculate the population, substitute the value of t into the population model equation.

Front

What is the relationship between sound intensity and decibels?

Back

Front

What does a sound intensity level of 132 dB indicate?

Back

A sound intensity level of 132 dB indicates a very high intensity of sound, which can be harmful to hearing.

Front

What is the significance of the mean time in a normally distributed dataset?

Back

The mean time represents the average time taken to complete a task, such as a race, and is a key measure of central tendency.