what is meant when we speak of true value of a parameter which statement is considered statistically robust what is a normal distribution? what is inference in statistics what is meant by degrees of freedom in statistics? what is the t distribution in statistics why use t distribution instead of proportion what does normal mean statistically in statistics what does it mean to speak of the true value of a parameter, considering that we are only using distributions that look similar to the data? what does it mean to speak of the true value or mean of a parameter? why use the t distribution in inference what is the definition of a normal distribution what is the definition of proportions and mean? what does it mean to speak of the true value of a parameter in statistical inference what is the purpose of using proportions and means in a statistical analysis what are the types of questions that you can use to answer a statistical inference? how to answer the question of whether a distribution is normal or not why use t distribution instead of proportion what does it mean to speak of the true value of a parameter, considering that we are just using distributions that happen to look similar to data? what is the definition of normal