Ateam of dermatological researchers were studying skin cancer among 60-70 year old american men. suppose you were a part of the research team and take a sample of n=70 men from this age group and calculate the mean number of skin cancer spots in the sample. also suppose that it is known that the distribution of the number of cancer spots is right-skewed.

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.