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According to the American Lung Association, 90% of adult smokers started smoking before turning 21 years old. Ten smokers 21 years old or older are randomly selected, and the number of smokers who started smoking before 21 is recorded.
A- Explain why this is a binomial experiment.
B- Find & interpret the probability that exactly 8 of them started smoking before 21 years of age.
C- Find & interpret the probability that fewer than 8 of them started smoking before 21 years of age.
D- Find & interpret the probability that at least 8 of them started smoking before 21 years of age.
E- Find & interpret the probability that between 7-9 of them, inclusive, started smoking before 21 years of age.
let test statistic t have a t distribution with df degrees of freedom.a as df gets larger what distribution does t
Use a calculator with mean and standard deviation keys to verify that the sample mean is x = 5.63 pups with the sample standard deviation s = 1.78 pups. (b) Find a 75% confidence interval for the population.
according to u.s. news amp world report data in 1995 tuition costs at indiana university a public university were 2984
Two events are mutually exclusive: If their intersection is 1, If they have no sample points in common.
The Johnson family uses a propane tank for cooking on their gas grill. During the summer they need to replace their tank on average every 30 days.
a gas undergoes three processes in series that complete a cycleprocess 1-gt2 compression from p1 10 lbfin2 v1 4.0 ft3
One group is given the new drug and the other group is given the standard drug. Data are recorded on the effects of each drug. Is the research division using dependent or independent samples? Why?
If a group of 400 school children are selected at random, what is the probability that at most 70 children will miss school because of asthma?
Construct a 95% confidence interval for the proportion of votes that Jefferson will receive, and make a conclusion about Jefferson winning election.
jinbao produces tubas and ships them in lots of twenty. suppose that 60 of all such lots contain no defective tubas 30
Two pediatricians want to investigate a new laboratory test that identifies streptococcal infections. Dr. J uses the standard culture test, which has a sensitivity of 90% and a specificity of 96%. Dr. M uses the new test, which is 96% sensitive an..
Estimate the percentage who weigh more than 180 pounds? Assume that we want 96% confidence that the error is no more than 2 percentage points.
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