The fact that the tails of a normal distribution never touch the horizontal axis relates to the following property ______. Group of answer choices symmetrical asymptotic equidistant approximate Flag question: Question 27 Question 271 pts When we want to infer from a sample to the population, what assumption must be met? Group of answer choices The sample is normally distributed. The sample is large. The population is normally distributed. The population is large. Flag question: Question 28 Question 281 pts Under the normal curve, approximately what percentage of scores falls between -1 and +1 standard deviations around the mean? Group of answer choices 14% 34% 68% 95% Flag question: Question 29 Question 291 pts What type of standard score has M = 0 and SD = 1? Group of answer choices IQ score T score X score Z score Flag question: Question 30 Question 301 pts What percentage of all scores fall below a z score of +1? Group of answer choices 16% 34% 50% 84%