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A poll of 1200 randomly selected students was conducted and found 58% favor decriminalizing all drug use that is currently illegal. Would confidence in the results increase if the sample size were 3600 instead of 1200? Why or why not?
A study of 20 families in a certain large city showed that the average income was $33,210 in 2000 with a standard deviation of $1800. Test the hypothesis that the true average income in this city was actually $31,000 against the hypothesis that it..
a teacher gave a reading test to a class of 5th grade students and computed the mean median and mode for the test
Find the probability that 70 randomly selected washing machines will have a mean replacement time less than 9.1 years.
Assume that the population of heights of treated plants is normally distributed with mean. Based on the sample, can it be concluded that is different from centimeters? Use the level of significance. Perform a two-tailed test. Then fill in the table..
In a large metropolitan area, past records revealed that 30 percent of all the high school graduates go to college. Each student's choice to go to college is independent. From 20 graduates selected at random, what is the probability that exactly 8 wi..
Same population with a known mean of 1.8 grams. Do the bats appear to be from the same population? You may assume the sample data comes from a population that follows a normal distribution.
the real estate assessor for a county government wants to study various characteristics of single family houses in the
ssuming that the shipment includes 3% defectives, what is the probability that the shipment will be accepted? (Hint: Use the binomial distribution.)
In a random sample of 512 parents with young children, 275 admitted to spanking their child as a regular form of punishment. Use the classical approach, at a 10% level of significance, to test the sociologist's claim.
a student takes a 20-question multiple choice exam and guesses on each question. each question has 4 choices only one
a machine is designed to fill jars with 16 oz. of coffee. a consumer suspects that the machine is not filing the jars
At the 5% level of significance, can we infer that branch A has a significantly higher proportion of satisfied customers than branch B?
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