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An article in the San Jose Mercury News stated that students in the California state university system take 4.5 years, on average, to finish their undergraduate degrees. Suppose you believe that the mean time is longer. You conduct a survey of 49 students and obtain a sample mean of 5.1 with a sample standard deviation of 1.2. Do the data support your claim at the 1% level?
A contract provides for a benefit of 1 at time 10 provided that failure occurs before time 10. You are given that v(10) = 0.6. Find the expectation and variance of the present value of the benefits.
How many cars do they expect to stop before finding a driver whose seatbelt is not buckled?- What's the probability that the first unbelted driver is in the 6th car stopped?
the average selling price of blackberry smart phones purchased by a random sample of 35 customers in 2010 was 311.
identify the sample space of the probability experiment and determine the number of outcomes in the event. draw a tree
Does delaying oral practice hinder learning a foreign language? Researchers randomly assigned 25 beginning students of Russian to begin speaking practice immediately and another 25 to delay speaking for 4 weeks.
The various measures of central tendency: compare them (how they are similar) and contrast them (how they are different), including specific references to numbers, pictures, and tables derived from the data set.
Assume that each of 2000 individuals living near a nuclear power plant is exposed to particles of a certain kind of radi- ation at the rate of one per week. Suppose that each hit by a particle is harmless with probability 1 - 10-5 and produc..
If a random sample of 21 is taken, what is the probability that the sample of kindergarten children has a mean height of less than 39.4 inches? (Give your answer correct to four decimal places)
Determine the class with the greatest number of data values.
using a particular set of data 3 types of forecasting methods were used on that data set? the first forecasting method
The probability that a call-centre consultant receives 3 calls during any given hour is 0.1404 and the probability that the consultant receives 5 calls during any given hour is 0.1755. Assuming that the calls are Poisson-distributed, calculate the p..
The article "A Probabilistic Analysis of Dissolved Oxygen-Biochemical Oxygen Demand Relationship in Streams" (J. Water Resources Control Fed., 1969: 73-90) reports data on the rate of oxygenation in streams at 20°C in a certain region.
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