Mathematics, 13.10.2019 22:10 giany
Take another look at the two studies described above: study a (the dog food study) and study b (text messages). the
term random sample implies that a sample was randomly selected from a population. the terms random selection and
random assignment have very different meanings.
random selection refers to randomly selecting a sample from a population. random selection allows generalization to a
population and is used in well-designed observational studies. sometimes, but not always, the subjects in an experiment
are randomly selected.
random assignment refers to randomly assigning the subjects in an experiment to treatments. random assignment
allows for cause-and-effect conclusions and is used in well-designed experiments.
in study b. the data were collected from two random samples of students.
5. can the results of the survey be generalized to all ninth-grade and all eleventh-grade students at the school? why or
why not? discuss in detail.
6. suppose there really is a difference in the mean number of texts sent by ninth-grade students and by eleventh-grade
students. can we say that the grade level of the students is the cause of the difference in the mean number of texts
sent? why or why not? discuss the answer in detail.
Answers: 2
Mathematics, 21.06.2019 19:00, nicolemaefahey
How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)
Answers: 1
Mathematics, 21.06.2019 21:40, dededese2403
Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels. ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0
Answers: 1
Take another look at the two studies described above: study a (the dog food study) and study b (tex...
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