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The effects of alcohol intake on aggressive driving are studied in a group of students tested on a driving simulator. One group of 15 students is tested first with a placebo, given an ounce of alcoh
In a group of students, 25% smoke cigarettes, 60% drink alcohol, and 15% do both. Determine the probability that a randomly selected student from the group has at least one of these "bad habits"?
A deck of playing cards has all aces and all the number cards removed. The twelve face cards remain. After shuffling, each of three players is dealt a card. (i) Determine the probability that the fi
A basketball player has made 75 out of 100 free throws throughout the season. She is about to shoot her next free throw. For $7 you can purchase a betting ticket that "pays off" $10 if she makes it.
A random variable is BLANK as if the number of all possible outcomes is infinite set of possible numbers and BLANK if set of all possible outcomes is finite or enumerable set.
A large number n of blood samples are to be screened for HIV. Testing each sample separately needs n tests. Pooling half of each sample needs one test if all samples are free from HIV, while if at l
A survey indicates that 33% of consumers from certain region are willing to spend extra for products and services from socially responsible companies. The researchers determine these consumers as so
A stick of length 1 is broken at random. How much longer is longer piece than shorter piece, on average? (Hint: Let Y denote the randomly selected point at which it is broken. Illustrate L as the le
Given a normal distribution with mean = 46 and standard deviation = 3, complete parts (a) through (d).
An article reported following data on oxidation-induction time (min) for various commercial oils:
An electronics gadget company has currently created the new line of fitness devices that monitor an individual's activity throughout the day. The lifetime of the device is distributed exponentially
If possible, employ the normal distribution to approximate the sampling distribution of the proportion. Complete parts (a) through (g).
Find out out the sample proportion, p, of households with cellular telephones that can be used to access the internet. If the population proportion is .75, determine the standard error of the proporti
For most recent year available, the mean annual cost to attend a private university in the United States was $26,889. Assume the distribution of annual costs follows the normal probability distribut
For the most current year available, the mean annual cost to attend private university in United States was $26,889. Suppose the distribution of annual costs follows the normal probability distribut
Given a normal distribution with ? = 104 and standard variation = 25, and given you select a sample of n=25. Complete parts (a) through (d)
Given population of safety records (incidents per year) in 2007 for employees of large manufacturing company, point to what the sampling distribution for samples of 10 would consist of.
Calculate the unbiased estimates of standard deviation and variance, 4,5,6,2,5,7,5,6,8,5 (show work)
A person is "flagged" by the insurance company if their expenses are greater than 75% of all other individuals with this policy. What amount of total expenses does an individual need to exceed to be
The time it takes the cell to divide (called mitosis) is modeled by lognormal distribution with an expected time of one hour and a standard deviation of 10 minutes.
A social worker tracked depression levels of clients being treated with cognitive-behavioral therapy for depression. For each client, depression was assessed at weeks 1 to 20 of therapy. She calcula
Let X denote the total medical expenses (in 1000s of dollars) incurred by a particular individual during a given year. X is approximated by a continuous distribution with a pdf of: f(x)={c(x+4)^(-4)
Find out the point estimate of the population mean and margin of error for the confidence interval.
Develop a confidence interval of the population proportion at the given level of confidence
In game of blackjack, find out the odds of dealing yourself a blackjack (ace + face-card or ten) from a single deck. Show how you arrived at your answer. If you are not sure, post an idea to get us