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American Red Cross
Only 4% of people have Type AB blood. A bloodmobile has 12 vials of blood on a rack. If the distribution of blood types at this location is consistent with the general population, what's the probability they find AB blood in:
a) None of the 12 samples?
b) At least 2 samples?
c) 3 or 4 samples?
If random samples of 36 download times are selected, what is the probability that the sample mean will be less than 0.84 seconds?
At the time she was hired as a server at the restaurant, Beth was told, "You can average more than $20 a day in tips." Over the first 31 days she was employed, the mean daily amount of her tips was $21.76,
Jim owns three real estate offices in Anytown. He has decided to open one more office, but cannot decide between hometown or uptown as the towns where he wants to locate.
You are asked to test his claim. How would you write the null hypothesis if: a) you represent the internet provider and want to support the claim?
The results are analyzed via two- factor ANOVA, one factor being network and the other factor being news time. Complete the following ANOVA table for this study, and give a full interpretation of the results.
What are the four assumptions for the chi-square tests? What are the hypothesis when conducting the chi-square tests for goodness-of-fit?
What is your conclusion regarding null hypothesis?
a company has recorded data on the weekly sales for its product y the unit price of the competitors product x1 and
the waiting time in minutes between ordering and receiving your meal at a certain restaurant is exponentially
Let Y = X2 + Z, where Z is a zero-mean unit variance Gaussian rv. Show that no unbiased estimate of X exists from observation of Y. Hint. Consider any x > 0 and compare with -x.
You are taking a multiple-choice quiz that consist of 7 questions. find the probability of guessing exactly four answers correctly.
Furthermore, assume that the standard deviation of the population is $0.14. The value of the test statistic for this hypothesis test and the p-value respectively are?
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