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Find the expected value, variance and standard deviation of the random variable X defined as ‘retirement at 65'.
The second urn depending on whether the outcome was heads or tails. What is the conditional probability that the outcome of the toss was heads given that a white ball was selected?
a) What is the standard error of the mean for these data? b) What is the 90% confidence interval for the population mean (µ)?
What is the probability of selecting two aces (without replacement) from a well-shuffled deck of cards?
What is the sample pace? If, at all times, each marble in the box is equally likely to be selected, what is the probability of each point in the sample space?
A statistics instructor is interested in the correlation (Pearson r) between how many hours a student sleeps the night before the final examination and the students score on the final examination.
If 0.5 percent of the population actually has the disease, what is the probability a person has the disease given that his test result is positive?
Use these data to test the null hypothesis of no difference in the use of sick days between younger and older adults. Use α = 0.05. What do your results indicate?
A family has two children. What is the conditional probability that both are boys given that at least one of them is a boy?
Using a = .05, test the hypothesis that there is a relationship between perceptions of police performance and area of the city for Montgomery. What might you tell the police chief?
If she takes the chemistry course then she will receive an A grade with probability 1/3. Bev decides to base her decision on the flip of a fair coin. What is the probability that Bev will get an A
If the number of misprints in his history chapter is Poisson distributed with mean 5, then assuming Sam is equally likely to choose either book, what is the expected number of misprints that Sam
A manuscript is sent to a typing firm consisting of typists A, B, and C. Let X denote the number of errors in the typed manuscript. Assume that each typist is equally likely to do the work.
Gender Discrimination? Your firm is being sued for gender discrimination and you are asked to evaluate the data. There appears to be a highly significant difference between men's and women's salari
The X column indicates the number of client contact last month, and the Y column shows the value of sales ($ thousand) last month for each client sampled. Find the coefficient of correlation:
This continues, with the winner always playing the waiting player, until one of the players has won two sets in a row. That player is then declared the overall winner. Find the probability that A
To help the Greasy Spoon restaurant manager target the correct age levels, you want to find if there is a statistically significant difference @ the 5% level between the age of the restaurant custo
A pistachio rancher buys a new fertilizer system that is supposed to increase the yield per acre. She uses the system for one year and notes the following output per acre: Calculate the Averag
A box contains 20 DVDs , 4 of which are defective. If two DVDs are selected at random without replacement from this box what is the probability that both are defective?
Explain the difference between a one sample and a two sample hypothesis test; provide an example of each.
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?
Note: after 5o years of age both the mean and standard deviation tend to increase. What is the probability that for an adult (under 50 years old) after a 12 hour fast.
Purchasing manger is currently reordering whenever the inventory on hand is equal to twice as much as the safety stock level. Calculate the reorder point and achieved fill rate in this policy.
The company's policy is to provide 95% of the demand from the inventory on hand; they hold a safety stock of 42 units to provide this policy. (Use the approximations for service and backorder level