research methods- topics idk

• measures of dispersion include the range and standard deviation
• measures of central tendency include mode, mean and median
• discrete data is data that has specific values e.g number of people
• continuous data: data that can take any value between two limits, such as height, weight, temperature, and distance
• histograms are used to display continuous data with no spaces between bars
• a type I error (false-positive) occurs if an investigator rejects a null hypothesis that is actually true 
• a type II error (false-negative) occurs if the investigator fails to reject a null hypothesis that is actually false in the population
• face validity is the degree to which a test appears to measure what it is supposed to measure