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Suppose we draw two tickets from a hat that contains tickets numbered 1,2,3,4. Let X be the 1st number drawn and Y be the second. Find the joint distribution of X and Y.
Random sample of 150 viewers last night revealed 53 watched news on WNAE, 64 watched on WRRN, and 33 on WSPD. At .05 significance level, is there a difference in proportion of viewers watching three channels?
The probabilities .9 and .1 respectively. Give the probability distribution for daily sales. Find the mean and standard deviation of the daily sales.
the probability that it will improve is .10. Determine the best country to construct the new facility in and the expected value of perfect information.
What is the Variance, Standard Deviation and Range of the following set of scores? 20,24,26,22,18,16,18 and then 10,15,12,18,19,16,12
A software company wants to determine whether there is a relationship between their three sales offices and the sales of their software products. The actual sales results are
When we say we have a confidence level of 95%, what do you think our "margin of error" is? If we move the level of confidence from 95 to 99%, what will happen to our margin of error? What will happen to the width of our confidence interval?
suppose that a 2-year old boy named cahnce sits at a computer and types exactly 6 unique alphabet keys. what is the
Describe whether statements regarding statistical significance are true or false. When your results are found to be statistically significant, can one conclude that they will have a meaningful effect in the clinic.
Use normal disrtibution of fish lengths for which the mean is 8 inches and the standard deviation is 5 inches. Assume the variable x is normally distributed.
If only one bolt is chosen, determine the probability that it will be found defective for only 1 reason (that is. it is either too large or has poor workmanship, but not both.)
How variable is the number of service calls with which Sam's department must deal?
Describe the "third variable problem" as it relates to correlation and provide an example of how you might see this played out in your own field.
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