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 18:30
Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?
Answers: 3
Mathematics, 21.06.2019 19:00
What are the first 4 terms in the multiplication pattern given by the formula 2×4n
Answers: 1
Mathematics, 21.06.2019 21:00
Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.
Answers: 1
Mathematics, 21.06.2019 22:00
Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b
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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