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Suppose the present value of a risky investment is approximately normally distributed with mean $10,000 and standard deviation $4,000. What is the probability that present value of the investment is less than $1,000? Greater than $20,000?
A random sample of 56 people measured accuracy w/ positive errors representing watches that are ahead of the correct time and negative rep. those behind the time.
A recent national survey found that high school students watched an average (mean) of 7.5 DVDs per month with a population standard deviation of .60.
a companys manufacturing process uses 500 gallons of water at a time. a scrubbing machine then removes most of a
If the doctor wants to use height to predict head circumference run a linear regression on the data. Find the r-value and comment about it.
A 56-question multiple choice test has 4 possible answers for each question and a student chooses the answers to each problem at random. A student selects 16 correct answers.
A newspaper article discussed the opening of a Whole Foods Market in the Time=Warner building in NYC. What assumption is necessary about the population distribution in order to perform the test
A random sample of 70 printers discovered that 20 of them were being used in small businesses. Find the 99% limit for the population proportion of printers that are used in small businesses.
If you draw a ball, record the color then draw a second without replacing the first ball, what is the probability of choosing two green balls?
For a sample of 120 students selected at random, what is the mean and variance of the number of students who watch this game?
The least squares simple linear regression line minimizes the sum of the vertical deviations between the line and the data points.
test for single mean.according to one investigators model the data are like 400 draws made at random from a large box.
SAT I scores around the nation tend to have a mean scale score around 500, a standard deviation of about 100 points and are approximately normally distributed. A person who scores (a perfect) 800 on the SAT I has approximately what percentile rank..
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