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1. Simplify and evaluate: (42x3y-2z-3/x-5y8z-9)2
2. Convert to scientific notation (here you may use x as multiplication): 0.00083
3. For f(x) = 6x - 7, find f(2).
4. Perform the indicated operations: (-x2 - 6x + 3) - (-9x2 + x - 1) - (x2 + 5x - 2)
5. Use FOIL to multiply: (8x - 1)(2x + 5)
6. Multiply: (x4 - 4x2 - 5)(x2 - x + 2)
7. Multiply the polynominals: (3t - 2)(2t + 3)
8. Give an example of using the distributive property for a negative monomial times a trinomial with different signs on the terms [for example: -3x(2xy + 3y - 2x)] and show each step of the distribution. Why do you think many students make sign errors on this type of problem? What would be your advice to a student who has trouble with the signs?
The summation sign is usually represented by:
These data are presented below. Should the manager be given an increase in staff? Why or why not? Please show your work.
What is the value of the test statistic? (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
In a certain city, there are 100,000 persons age 18 to 24. A simple random sample of 500 such persons is drawn, of whom 198 turn out to be currently enrolled in college.
Suppose you are testing the differences in attitudes toward health care reform using Democrats, Republications, and Independents. What statistical test would you use?
The standard deviation of the sample is 2.5 calls. Using the .05 significance level, can we conclude that the mean number of calls per salesperson per week is more than 44?
Suppose that the incident rate of a particulat kind of accient is 1/10,000 persons. In a town of 50,000 persons, what is the probability that there is no accident of this kind?
An article reports that when each football helmet in a random sample of 44 suspension-type helmets was subjected to a certain impact test, 25 showed damage.
At the .05 significance level, is there a difference in the proportion of viewers watching the three channels?
As an illustration, if contestant 1 obtains a smaller value than contestants 2 and 3 but contestant 4 has a smaller value than contestant 1 (X4 n) as a function of n.
If student is chosen at random, determine the probability that he or she is sophomore and owns a credit card.
The parameter of interest is the mean score in this population. The sample is an SRS of size n = 4 drawn from the population. a) Find the mean of the 10 scores in the population. This is the population mean.
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