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If 60 percent of those people chewing the gum are successful in stopping smoking, what is the probability that in a group of four smokers using the gum at least one quits smoking?
Twelve case of leukemia are reported in people living in a particular census tract over a 5 year period. Is the number of cases abnormal if only 6.7 cases would be expected based on national cancer-
In pharmacological research a variety of clinical chemistry measurements are routinely monitored closely for evidence of side effects of the medication under study. Suppose typical blood-glucose lev
A scientist attempts to perform a difficult experiment. She is successful in about 80% of her attempts. She attempts the experiment 6 times. Let X is the number of these attempts that succeed. Find
Use the normal approximation to the binomial to find the probability of X = 20 when n = 30 and p = 0.5.
The average charitable contribution deduction on federal tax returns for the year 2007 was $625. Suppose that the distribution of contributions is normal with a standard deviation of $100.
Consider the following frequency of demand: If the simulation begins with 0.8102, the simulated value for demand would be
An old study of 1000 people in Phoenix found that 27 were obese. Find the 99% confidence interval of the population proportion of persons living in Phoenix who are obese.
The widget are randomly selected (without replacement) and all are found to be okay(not defective). A box contains 30 widgets, of which 3 are defective. What is the probability that the box is ac
Find the 98% confidence interval for this tax in all 50 states, the District of Columbia, and Puerto Rico.
Pizza Hut wishes to find the 90% confidence interval of the true mean cost of a medium "veggie" pizza. How large a sample is needed if the store manager wants to be accurate to within $0.10?
A study of 35 golfers showed that their average score was 92. The standard deviation of the sample was 5. Find the 95% confidence interval of the mean score for all golfers.
If no estimate of the sample proportion is available, how large a sample is needed?
An apartment building has 8 floors? If seven people get on the elevator on the first floor, what is the probability they all want to get off on different floors?
How large a sample must one take to be 90% confident that the estimate is within 0.05 of the true proportion?
Vendor As defect rate is 0.01 and Vendor Bs defect rate is 0.03. What is the probability that a randomly selected part will be a defective part from Vendor B?
Of all 3 - 5 year old children, 71% are enrolled in school. If a sample of 400 children are randomly selected, what is the probability that at least 300 will be enrolled in school.
The haemoglobin A test,a blood test given to diabetics during their periodic check-ups,indicate the level of control of blood sugar during the past two or three months.the following was obtained for
Let Y be a uniform random variable defined over the interval (0,2). Find an expression for the rth moment of Y about the origin.
We have a bag with 10 red, 10 blue and 20 green marbles. you draw two marbles out of this bag without replacement. What is the probability of not getting any green marbles?
Assume that the number of hours worked per week for those who work full time is normally distributed. Suppose 12% of these workers work more than 48 hours. Based on this percentage, what is the sta
A laptop manufacturer finds that the average time it takes an employee to load a laptop with software is 40 minutes with a standard deviation 15 minutes.
What is the probability of selecting a family that has either a Visa card or an American Express card?
The time, in minutes, it takes to install a certain software package is a continuous variable with the density. Find the standard deviation of the installation time
Eight percent of families have both a MasterCard and an American Express card. Twelve percent have both a Visa Card and a MasterCard. Six percent have both an American Express card and a Visa card.