Aflask containing photosynthetic green algae and a control flask containing water with no algae are both placed under a bank of lights that is set to cycle between 12 hours of light and 12 hours of dark. the dissolved oxygen concentrations in both flasks are monitored. predict what the relative dissolved oxygen concentrations will be in the flask with algae compared to the control flask. the dissolved oxygen in the flask with algae will be higher when the flasks are exposed to light. be lower when the flasks are exposed to light. be the same in both flasks no matter if light is present or absent. be higher when the flasks are maintained in a dark environment.

An education expert is researching teaching methods and wishes to interview teachers from a particular school district. she randomly selects ten schools from the district and interviews all of the teachers at the selected schools. which type of sample did she use in this study? a)systematic sample b)probability sample c)stratified sample d)cluster sample

Explain the difference between an independent and dependent sample. choose the correct answer below. a. in an independent sample, the individuals are chosen without replacement; in a dependent sample, the individuals are chosen with replacement. b. in a dependent sample, one would use a two-tailed hypothesis test; in an independent sample, one would use a one-tail hypothesis test. c. a sample is independent when an individual selected for one sample does not dictate which individual is to be in the second sample. a sample is dependent when an individual selected for one sample dictates which individual is to be in the second sample. d. a sample is independent when an individual selected for one sample dictates which individual is to be in the second sample. a sample is dependent when an individual selected for one sample does not dictate which individual is to be in the second sample. independent samples are often referred to as matched-pairs samples.

3. define historiography. has historiography changed over time or stayed the same? why is this distinction important? use complete sentences for your response. (4 points)