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A university has 10,000 students of which 8000 are male and 2000 are female. If a class of 30 students is chosen at random from the university population, find the mean and variance of the number o
Suppose that a malfunction was reported and it was found to be caused by other human errors. What is the probability that it came from station C?
Super Cola sales breakdown as 80% regular soda and 20% diet soda. While 60% of the regular soda is purchased by men, only 30% of the diet soda is purchased by men. If a woman purchases Super Cola,
There are two more assignments in a class before its end, and if you get an A on at least one of them, you will get an A for the semester. Your subjective assessment of your performance is:
The disc containing the only copy of your term project just got corrupted. find your thesis, what is the probability that your thesis is on disc i for i = 1,2,3,4.
Construct a 90% confidence interval estimate for the fraction of current spring students who will return to summer school.
In a sample batch of 46 mechanical pencils it is assumed that 18 are defective. If 5 mechanical pencils are randomly selected, what is the probability that none of them are defective?
In the set of all past due accounts, let the event A mean the account is between 31 and 60 days past due and the event B mean the account is that of a new customer. The complement of A is:
Compute the probability of selecting a credit card customer at random and finding the customer charged between $70 and $83.
To establish a driver education school, organizers must decide how many cars, instructors, and students to have. Costs are estimated as follows. Annual fixed costs to operate the school are $30,000.
A company wants to estimate the average sales lunch expense. If less than that many receipts are sampled, which answer best describes what happens?
There is a fixed cost of $50,000 to start a production process. Once the process has begun, the variable cost per unit is $25. The revenue per unit is projected to be $45.
Is there a relationship between the age of an unemployed individual and the number of weeks of unemployment? Explain.
Consider prices of $20, $30, and $40. Which price alternative will maximize total revenue? What are the values for demand and revenue at this price?
If the sample mean is 12.7 oz. and the sample standard deviation is 0.70 oz., find the 95% confidence interval of the true mean.
A snack food manufacturer buys corn for tortilla chips from two cooperatives, one in Iowa and one in Illinois. The price per unit of the Iowa corn is $6.00 and the price per unit of the Illinois cor
At the 0.01 level of significance, can the student group conclude that there is a difference in average textbook prices for new textbooks sold on campus and over the Internet?
In performing a hypothesis test where the null hypothesis is that the population mean is 4.8 against the alternative hypothesis that the population mean is not equal to 4.8, a random sample of 25 i
1 prize of 3000. Assume that 22,000 lottery tickets are issues and sold for $1. What is the lottery's expected profit per ticket?
Is there a significant difference in mean HDL levels among the exercise groups? Run the test at a 5% level of significance. HINT: SSwithin = 21,860.
At the time she was hired as a server at the Grumney Family restaurant, Beth Brigden was told, "You can average at least $20 a day in tips." Over the first 35 days she was employed at the restauran
Generate a 95% confidence interval for the difference in mean HDL levels between men when exercise regularly and those who do not.
A company manufactures wind turbines. A random sample of 25 turbines is taken and the sample mean life is 20.00 years with a standard deviation of 2.50 years. If you were constructing a 99% two-sid
In a random sample of 10 on-line statistics students, information was collected about their minutes studied and their chapter test scores. Is this relationship positive, negative or no relation?
A cola-dispensing machine is set to dispense on average 7.00 ounces of cola per cup. The standard deviation is 0.10 ounces. The distribution of amounts dispensed follows a normal distribution.