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In order to estimate the difference in the yearly incomes of marketing managers in the East and West of the United States, the information below was gathered. Compute and explain a 95% confidence interval estimate of the difference in average yearly incomes between the two regions of the country.
East WestSample size 40 45Sample mean $72,000 $78,000Sample standard deviation $6,000 $8,000
Suppose you are waiting for your federal tax refund. On average, how many weeks would you have to wait before receiving your refund?
Create a stem-and-leaf display of these data. Create a box plot of these data.
When the necessary conditions are met, a two-tail test is being conducted to test the difference between two populations proportions.
q1 the average age of ceos is 56 years. assume the variable is normally distributed. if the standard deviation
The probability that a house in an urban area will be burglarized is 5%. If 50 houses are randomly selected, what is the probability that one of the houses will be burglarized?
Write down the probability distribution of X, the insurance company's annual gain from such a policy (i.e., the amount of money made by the insurance company from such a policy).
what distinguishes raw scores from difference scores besides the fact that difference scores are used in t-statistic
compute the expected value and variance of U.Determine Expected value and variance using uniform distribution.
Find the minimum sample size required for estimating the overall proportion of students who passed Exam P in 2009 to within 4% with 95% confidence if it is known that this proportion is between 30% and 40%.
Consider babies born in the "normal" range of 37 - 43 weeks gestational age. What is the probability that the birth weight of a randomly selected baby of this type:
What is the probability of selecting 10 production employee at random on a hot summer day and finding that none of them are absent.
Mmean number of outgoing calls in a random selection of calls? Also, compute the standard deviation. In a selection of 12 calls, what is the probability that less than 3 were outgoing?
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