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Problem based on combinatory.
The state of Virginia's license plate has three letters followed by four digits. Assuming that any letter or digit can be used, how many different license plates are possible?
Form the column of differences and find the mean and standard deviation of this column of numbers.
How many cans of paint should the sample contain if the researcher wants to be 98% certain of being within one percentage point of the true proportion of this chemical?
Hypothesis test for the difference between two means - Assume the population standard deviations are not the same. At the 0.05 significance level, is there a difference in the mean waiting time?
Dr Johnson wants to know if there is sufficient evidence to conclude that the grade distribution of his class is different than the historical grade distribution.
What should the cut-off score be for the interviews? (Round to nearest whole number).
What was the highest score earned on the exam? According to Chebyshev's Theorem, how many students scored between 42 and 74?
Find out the cheapest way of manufacturing today's batch of NasaMist.
You find that a random sample of five microwave ovens has a mean repair cost of $75 and a standard deviation of $12.50. At α = 0.01, do you have enough evidence to support the repairer's claim?
Is there evidence of violations of the usual ANOVA assumptions of equal variances and normal populations? Set up and perform appropriate TESTS at the α = 0.05 level of significance.
Find the critical value for different types of sample size and level of significance:
Here are fifty observations on the weight of tea bags. Calculate the Standard Deviation and Variance.
In a group of seven adult friends, what is the probability that: a) no one has done a one-time fling?
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