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The contents of bottles of beer are normally distributed with a mean of ? and a standard deviation of ? = 5ml.
What is the IQR of the distribution of all the average contents of all 6-packs? Use 3 decimal places.
Given the following number of hours between breakdowns for 4 machines, are the machines significantly different? If so, how are they different? Which machine is the best?
You are interested in knowing if there is a statistical difference in driving speeds between Day 1 and Day 10. Which statistical test would be appropriate? Why?
A local politician wants an estimate of the proportion of the population who support her fiscal policies. She wants the estimate to be within .06 of the true proportion. Assume a 95 percent level of confidence.
Bob compares his SAT Verbal score of 400 to Marge's ACT Verbal score of 20. "I beat you," he exclaims. "My score is 20 times your score!" Although his multiplication is good, his logic is faulty. Explain why.
The relative frequency distribution of the number of TVs sold in a day in a department store in the last year is as follows: Compute the mean and standard deviation of this distribution.
At the end of the Halloween Festival the organizers estimated that a family of participants spent in average $50.00 with a standard deviation of $15.00. If 49 participants (49 = size of the sample) are selected randomly, what's the likeihood that ..
You are given the following frequency distribution for the number of errors 55 students made in a test:
Consider the linear system x' = Ax, where A is a n x n real matrix. If x = x(t) is a solution of the linear system, we define:
Probability of two mutually exclusive events intersecting Can be any value between 0 to 1, Must always be equal to 1.
A standard deviation of 4.8. If the 36 people are randomly selected, How do I find the probability that their blood pressure will be less than 118?
At the 5% level of significance, can we infer that the population mean weight of athletic men is lower than the population mean weight of non-athletic men by more than 2 pounds?
What is the probability that a consumer selected at random: a. purchased fewer products than before? b. purchased the same number of products as before?
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