Please help with these questions. Thanks

A tax auditor selects even; lOOOth income tax return that is received. Identify which of these types of sampling is used. A) Stratied B) Systematic C) Simple Random D) Cluster E) Convenience Determine whether the given value is from a discrete or continuous data set. The time it takes a computer to complete a task. A) Continuous B) Discrete is the collection of data from ever}.r member of the population. A) sample B) census C) placebo D) statistic Determine whether the given description corresponds to an observational stud}r or an experiment. A doctor gives a new medication to half of his patients with the u and a placebo to the other half of his patients with the u. A) Observational study B) Experiment The similarity between an ordinal level of measurement and an interval level of measurement is that A) Both can be arranged in some order B) Differences between data values cannot be determined or are meaningless C) Differences between data values can be determined and are meaningful D) Neither can be arranged in some order