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Answer the questions:
a) A population variance is computed to be 81. What is the standard deviation?
b) A sample standard deviation is computed to be 4.5. What is the variance?
c) What is the standard deviation of the 6 grades (shown below) from a Statistics midterm?
85 85 85 85 85 85
d) Which group has the most variation? (Which one is the correct group?)
A B C
Mean 75.5 75.7 75.2
Standard Deviation 3.2 0.8 2.5
e) For an exam given to a class, the students' scores ranged from 25 to 95, with a mean of 65.
What is the most realistic value for the standard deviation (Choose): -10 0 3 70
Use the table of the binomial distribution given at the end of this book to determine the value of Pr(6 .:E;; X..; 9).
Give two examples of situations where there are two possible outcomes, as in the coin-tossing model, but the model is not appropriate.
let x and y be two independent random variables where x has a bernoulli distribution with probability of success p 12
In another you find the 4 year probability for diabetes is 0.5. Calculate the 1 year probability of getting diabetes.
Do the two stem and leaf plots look similar? Do you think this could be a viable method for telling whether different articles were written by different authors?
Tire pressure monitoring systems (TPMS) warn the driver when the tire pressure of the vehicle is 28% below the target pressure. Suppose the target tire pressure
If all lock combinations are equally likely, what is the probability of selecting a lock with only single-digit numbers in the combination?
post your response to the following questions and participate in the discussion with your fellow students during the
Using the 5% significance level, test the null hypothesis that the mean drying times for all such fabric produced by the three companies are the same.
What's The POPULATION of interest to the American company?
Do the randomization. Use computer software to carry out the randomization for Example 2.13.
an investigator measuring various characteristics of a large group of athletes found that the correlation between the
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