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A dish contains 20 gumballs - 9 blue, 6 red and 5 white. We randomly select two gumballs from the dish without replacement.
a) Let X be the number of blue gumballs selected. Complete the probability distribution of X by filling in the appropriate probabilities below:
x 0 1 2P(X = x)
b) What is the probability that X = 1 if no red gumballs are selected?
c) What is the expected value of X?
Write a brief summary of the distribution of life expectancy.
Which measure of association would the researcher use to compare the relationship between the IV and DV? Why?
Describe the standard normal distribution. Explain why it can be used to find probabilities for all normal distributions.
These can have a large impact on tenure and promotion decisions at many institutions. One particular instructor had ratings in 3 courses in one semester as given by the table below for the statement "The instructor is an excellent teacher.
Formulate the null and alternative hypotheses for this application.
Describe the error in the conclusion. Given: There is a linear correlation between the number of cigarettes smoked and the pulse rate. As the number of cigarettes increases the pulse rate increases. Conclusion: Cigarettes cause the pulse rate to i..
Find out best decision, by using following decision criteria.
It is believed that population standard deviation is 15 days. If test is conducted using 0.05 level of significance, what conclusion must be reached?
To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments.
Compute the value of z and state your decision regarding the null hypothesis.
Use the normal distribution to approximate the desired probability. Find the probability that in 200 tosses of a fair die, we will obtain at exactly 30 faces.
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
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