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Teachers' Salaries A researcher is interested in estimating the average salary of teachers In a large urban school district. She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to be accurate within $200?
Construct a 99% confidence interval for the difference between the true average boot times of the two types of hard drives. Assume the difference will represent (HDD-SSD) and that the population standard deviations are statistically the same.
In a regression analysis, three independent variables are used in the equation based on a sample of forty observations. What are the degrees of freedom associated with the F-statistic?
A market researcher wants to find the 99% Confidence Interval for the average number of hours people spend online each day.
Assuming that the data is normally distributed and the sample size is greater than 30, calculate the critical values for a two tailed and a one-tailed test when alpha = 0.05
Three cards are randomly selected from an ordinary deck of cards without replacement Compute the probability that the first card is a spade given that the second and third are spades.
Each of four tasters picks one coffee anyway (not knowing which is which, because the coffee is in identical cups). What is the probability that a) All four tasters choose Tasty Bean?
Please assist regarding an index based on how people feel about the economy. In this case, the base was 1985 and set at 100.
The mean weight of newborn infants at a community hospital is 6.6 pounds. A sample of seven infants is randomly selected
Write a system of inequalities representing this situation. Then draw a graph of the feasible region given these conditions, in which x is the number of AM radios and y is the number of AM/FM radios.
Fidelity Magellan is a large cap growth mutual fund and Fidelity Small Cap Stock is a small cap growth mutual fund (Morningstar Funds 500, 2006).
The mean salary of the nine employees of a small business is $52,000 per year. One employee, whose salary was $68,000, was red. Two new employees, who will each be paid a salary of $40,000, are hired. What is the new mean annual salary of the emp..
Standard deviation of 2.5 minutes. What does Chebyshev's Theorem say about the percentage of employees with commuting times between 58.6 minutes and 68.6 minutes?
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