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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.
The number of shark attacks and deaths over a recent 5- year period is shown. Find the mean, median, mode, midrange, variance, and standard deviation for the date. Which data set is more valuable?
an airline has 20 planes is short on money and doesnt want to spend any more than necessary to keep the planes safely
claire is ordering sandwiches for 60 students. she will cut each sandwich into fourths and each student will be allowed
Identify the definite integral that represents the area of the surface formed by revolving the graph of f (x)= x^3 on the interval [0,1] about the y-axis.
Solve by absolute value equation and Solve by factoring and use the zero product principle.
The U.S. Postal Service reports that we open and read 78% of the junk mail that we receive. A sports instructional video tape company sends out 10, 500 advertising brochures. How many of the brochures can it expect to be opened and read?
there were 244 pencils altogether. sean put them into 3 boxes. there were 70% more pencils in box A than in box B. there were twice as many pencils in box C than in box A. how many pencils were in each box?
a triangle field with vertice OPQ has sides OP=402 meters, PQ=388 meters, and QO=254 meters. find the perpendicular distance from the vertex P to the opposite side?
If Janice gets a 70 on a physics test where the mean is 76 and the standard deviation is 4, where does she stand in relation to her classmates?
A metal storage tank with a maximum volume of 1500m^3, is to be constructed in the shape of a right circular cylinder surmounted by a hemisphere. What radial and height dimensions will require the least amount of material?
Find the ball"s height and velocity at time t. b. When does the ball hit the ground and what is its impact velocity? C. When is the velocity 0? What is the significance of this time? D. How far does the ball travel during its flight?
how to solve: The cross section of a large telescope diameter of 360 ft and a maximum depth of 36 feet. What is the equation of this parabola?
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