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For a study conducted by the research department of a pharmaceutical company, 245 randomly selected individuals were asked to report the amount of money they spend annually on prescription allergy relief medication. The sample mean was found to be $17.60 with a standard deviation of $5.30 . A random sample of 210 individuals was selected independently of the first sample. These individuals reported their annual spending on non-prescription allergy relief medication. The mean of the second sample was found to be $18.40 with a standard deviation of $4.40. As the sample sizes were quite large, it was assumed that the respective population standard deviations of the spending for prescription and non-prescription allergy relief medication could be estimated as the respective sample standard deviation values given above. Construct a 95% confidence interval for the difference between the mean spending on prescription allergy relief medication () and the mean spending on non-prescription allergy relief medication (). Then complete the table below.
What is the lower limit of the 95% confidence interval? What is the upper limit of the 95% confidence interval?
Perform your intermediate computations to at least three decimal places. Round your answers to at least two decimal places.
a twin-engine aircraft can fly 1050 miles from city a to city b in 5 hours with the wind and make the return trip in 7 hours against the wind. What is the speed of the wind?
You are told that a line is tangent to the circle centred at (3,2) with radius 2. If the tangent line and circle intersect at the point (4, 2+ sqrt(3)) find the equation of the tangent.
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how many servings of each food are required to satisfy the physicians requirements?
the equation a=25000 - 1500t, where t is the time in minutes and a is the altitude in feet, represents the steady decent of a certain aiplane. Graph the equation using the x- and the y- intercepts. How long will it be before the airplane reaches t..
where is its height above the ground and is the horizontal distance traveled in meters. Calculate the distance traveled by the prey from the time it is dropped until the time it hits the ground.
How many pairs of shoes would you need to sell if you wanted to make a profit greater than $50000? Interpret your result.
the base of a cylindrical water tank has an area of 28 feet. when the tank is full it hold 140 feet of water. what is the hight of the tank?
Mountain view Gifts is experiencing constant growth. They recorded a total of $250,000 in sales in 2003 and $285,000 sales in 2008. in what year will they surpass the half million dollar mark?
What is the orientation or case of an ellipse with this equation 5x^2+13y^2=7? And how will I prove if its either horizontal or vertical?
The speed of a car traveling in a straight line reduced from 45 to 30 miles per hour in a distance of 264 feet. Find the distance in which the car can be brought to rest from 30 miles per hour, assuming the same constant deceleration.
a printing press has a roller 22 inches in diameter. A point on the roller's surface moves at a speed of 109 feet per second. What is the roller's angular speed?
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