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A sample of 15 recent college graduates found that starting salaries for attorneys in New York City had a mean of $102,342 and a standard deviation of $21,756. What does mu represent? The average sa
What is the value of the t score for a 98% confidence interval if we take a sample of size 22?
A random sample of 5 homes in Newberry, Florida had a mean of $169,900 and a standard deviation of $21,756. Construct a 95% confidence interval for the average home of this size in Newberry.
If the pH level of the reservoir is ok, the results at each location will have varying results, with an average pH of 8.5 and a standard deviation of 0.22. If the pH level of the reservoir is ok, wh
Suppose that 76% of Americans prefer Coke to Pepsi. A sample of 200 was taken. What is the probability that at least sixty eight percent of the sample prefers Coke to Pepsi?
According to the Coffee Research Organization the typical American coffee drinker consumes an average of 3.1 cups per day. A sample of 12 senior citizens revealed they consumed 3.4 cups per day with
What is the probability that a t test will find a significant difference between means at the 0.05 level? Give results for both one- and two-tailed tests. Hint: the power of a one-tailed test at 0.0
Prince Edward Island Fisheries and Environment has been feeding a special food to rainbow trout fingerlings in a pond. A sample of the weights of 40 trout revealed that the mean weight is 402.7 gram
Assume that the number of customers who arrive at a water ice stan d follows the Poisson distribution with an average rate of 6.4 per 30 minutes.
A camera manufacturer just shipped a batch of 36 digital cameras to local retailers and seven of the cameras have a defective sensor. Cutler Electronics received eight of these digital cameras. Wha
According to the Centers for Medicare & Medicaid Services, 16% of nursing homes received five stars in overall ratings in 2011. A random sample of six nursing homes was selected. What is the pr
The consumption of two types of manufacturing goods (X and Y) follows a hypothetical joint probability density function as follows:
What is the probability that a random point selected in the interval [0,4] will be an integer? What is the probability that a rancom point selected in the interval [0,4] will be an irrational number?
Past experience shows that ever new book by a certain publisher captures between 4 and 12% of the market. What is the probability that the next book by this publisher will capture at most 6.52% of t
The regression equation Salary = 28,000 + 2700 YearsExperience + 1900 YearsCollege describes employee salaries at Ramjac Corporation. The standard error is 2400. Mary has 10 years' experience and 4
The following regression equation, y-bar = 53.9 + 8.4x , relates x = the number of hours a student studies for a test and y = the corresponding test score (in percents). Explain the meaning of the y
In a soccer game, 35% of the players use normal cleats (A1), 40% of the players use newer cleats (A2), and 25% use old cleats (A3). Of those using normal cleats, only 20% are score a penalty. Of tho
The diameter of an electric cable is normally distributed, with a mean of 0.8 inch and a standard deviation of 0.01 inch. What is the probability that the diameter will exceed 0.81 inch?
Suppose that only 25% of all drivers come to a complete stop at an intersection having flashing red lights in all directions when no other cars are visible.
A quality control plan is to select 1000 items from the process, and if none are defective, the process continues. Use the normal approximation to the binomial distribution, the mean and the varianc
For the standard normal distribution, the area to the left of z = -1.35 is:
Find the following percentiles for the standard normal distribution. Interpolate where appropriate. (Round your answers to two decimal places.)
Suppose that 14% of all steel shafts produced by a certain process are nonconforming but can be reworked (rather than having to be scrapped). Consider a random sample of 200 shafts, and let X denote
The mean weight of luggage checked by a randomly selected tourist class customer flying between two cities on a certain airline is 30 lbs and the standard deviation is 3 lbs. If there are 49 tourist
Find the percentage of women meeting the height requirement.Are many women being denied the opportunity to hoin this branch of the military because they are too short or too tall?