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In the 107th Congress, the Senate consists of 13 women and 87 men. If a lobbyist for the tobacco industry randomly selects three different senators
For a sample selected from a population with a mean of µ=50 and a standard deviation of s= 10:
The heights of women at a large university are approximately bell-shaped, with a mean of 65 inches and standard deviation of 2.5 inches.
A person claims to have ESP (extrasensory perception). A coin is tossed 16 times, and each time the person is asked to predict in advance
Determine the value of c that makes the function f(x,y) = c(x+y) a joint probability density function over the range:
Expectation and variance of a random variable
An audit conducted by the St. Aleanis Hospital has determined that 15% of all patient bills contain an error of one form or another
A random variable Y is uniformly distributed over a range of 0 to 2*pi. Another random variable X is related to Y by X=cos(Y)
A recent study of the hourly wages of maintenance crew members for major airlines showed that the mean hourly salary was $20.50, with a standard deviation
During summer weekdays, boats arrive at the inlet drawbridge according to the Poisson distribution at a rate of 3 per hour.
From the data I gathered I developed histograms and calculated descriptive statistics
A stock price is currently $100. Over each of the next two three-month periods it is expected to increase by 10% or fall by 10%.
Wildlife Hummingbirds Selasphorus sasin is the scientific name for what is commonly called "Allen Hummingbird"
Use this table to response questions below: Some students were asked if they carry a credit card. Here are the responses.
On average, 40% of U.S. beer drinkers order light beer.
Some normal probability distributions may have the same mean, but their standard deviation may be different
How to calculate probabilities without knowing the std deviation.
A financial analyst estimates that the probability that the economy will experience a recession in the next 12 months is 20%
Money magazine reported that the average price of gallon of gasoline in the United States during the first quarter of 2001 was $ 1.46.
The personnel office at a large electronics firm regularly schedules job interviews and maintains records of the interviews
Consider babies born in the "normal" range of 37 - 43 weeks gestational age. Extensive data supports the assumption that for such babies born
A radio station that plays classical music has a "By Request" program each Saturday night. The percentage of requests for composers on a particular night
A newspaper article reported that people spend a mean of 6 hours per day watching TV, with a standard deviation of 1.9 hours
An investment will be worth $1,000, $2,000, or $5,000 at the end of the year. The probabilities of these values are .25, .60, and .15, respectively
An alcohol awareness task force at Big-Ten university sampled 20 students after the midterm to ask them whether they went bar hopping the weekend