Exercises 5–9: random selection and random assignment
take another look at the two studies described above. study a (the dog food study) is an experiment, while study b (text messages) is an observational study. 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 the answer with your partner.

step-by-step explanation:

i found the life tables for the year 2012. 

life table of males at age 30. probability of dying between ages x and x+1

total population:  

29–30 . . . . . . . . . . . . 0.001030

30–31 . . . . . . . . . . . . 0.001061

males:  

29–30 . . . . . . . . . . . . 0.001420

30–31 . . . . . . . . . . . . 0.001448

white population

29–30 . . . . . . . . . . . . 0.001005

30–31 . . . . . . . . . . . . 0.001037

white males

29–30 . . . . . . . . . . . . 0.001372

30–31 . . . . . . . . . . . . 0.001399

non hispanic white population

29–30 . . . . . . . . . . . . 0.001083

30–31 . . . . . . . . . . . . 0.001116

non hispanic white males

29–30 . . . . . . . . . . . . 0.001477

30–31 . . . . . . . . . . . . 0.001503

jacob, non hispanic white male. 30 years old.

probability that jacob lives to be 30 years old. 

since the given probabilities are probabilities of dying, i think we simply subtract it from 1 to get the probability of living. we will use the probability of non hispanic white male.

                                          probability of living to be 30 y.o.

29 - 30 : 1 - 0.001477 = 0.998523

30 - 31 : 1 - 0.001503 = 0.998497

the answer is 11.2 (i know i’m late)

-4, -2, 1, 4

step-by-step explanation:

domain = x values

range = y values