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Standard deviation and variance are how spread out the data is. This information is just as important as the mean or average because if the data is flat (standard deviation is large) then the data is spread out and difficult to predict. If the data distribution is small and the data is peaked then the variance is small and very predictable. In manufacturing you want a small standard deviation. In education you want a large standard deviation.
There is little variation in salt in McDonald's French fries. There is a large variation in what kind of coffee people prefer.
Can you think of other small and wide variation examples?
A certain statistics author's golf scores follow the normal distribution with a mean of 92 and a standard deviation of 4. What is the probability that, during his next round of golf, his score will be ...
Suppose you take a random sample of 10 tickets without replacement from a box containing 20 red tickets and 30 blue tickets.
A letter is drawn 1,000 times, at random, from the word A R AB I A. There are two offers. (A) You win a dollar if the number of A's among the draws is10 or more above the expected number. (B) You win a dollar if the number of B's among the drawsis 10..
What is the chance that finishers complete the run with the times between 50 and 70 minutes?
Test whether the music reduces studying capacity at a .05 level of significance.
simple linear regression equation.a stock market analyst at the newyork stock exchange was interested in the
historically the average time it takes jessica to swim the 200 meter butterfly is 148.4 seconds. jessica would like to
the weight of a candy bar is n50 1. we take a sample of 4 candy bars and compute the sample mean. the sample mean
Many U.S. government payments, such as social security benefits, are increased each year by the percentage change in the CPI.
Monash University has put in place a 4 week course of lunchtime exercise breaks for its staff to see if its employees' job satisfaction can be improved.
scores on a statistics exam are given 85 72 92 90 74 65 68 59 74 85 63 79 81 92 95 74 88 55.in preparation for
What is the probability that he recovers at least two pages of his math homework? Please help with the whole solution/method
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