Suppose a manufacturer produces computers in batches of 100 . A researcher is interested in the proportion of all computers produced that are faulty so he randomly samples one batch and finds 9 faulty cameras. Which of the following would be a reasonable estimate of the population proportion of cameras that are not faulty?
a. 0.91
b. 91
c. 0.09
d. 9
Question 2
An observational study:
a. analyzes data already available
b. makes it possible to rule out factors over which the researcher has no control for the observed effects
c. examines individuals that have been selected by the researchers
d. allows researchers to control for all extraneous factors
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