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Assume that the random sample of 400 US advertising agencies gives average percentage share of billing volume from network television equal to 7.46 percent, and suppose that σ equals 1.42 percent. Compute 95 percent confidence interval for mean percentage share of billing volume from network television for population of all US advertising agencies.
A tetrahedron is a fully-symmetric pyramid-like solid, with four faces made up of equal-sized equilateral triangles. Suppose that the four faces contain different number of spots, from one spot to four spots, so that the tetrahedron may be rolled ..
Find the probability of getting a head and rolling a six
To find out whether the course is effective in increasing sales, the appropriate set of hypothesis for testing is:
The weight of the oranges, in pounds (1 pound = 16 ounces) is a random variable with standard deviation
A brand name has 60% recognition rate. if the owner of the brand wants to verify that rate by beginning with a small sample of 5 randomly selected consumers, find the probability that exactly 3 of the 5 consumers recognize the brand name. Also fin..
At a certain university, the average cost of books per student was 400.00 last semester. In a sample of 40 students this semsester, their average cost was 340.00 with a standard deviation of 80.00.
Each F-distribution is identified by two numbers of degrees of freedom, one for each of the two samples involved.
Conduct the following test using 95% level of confidence.
To test whether there is significant mean difference between two groups using independent sample t test.
The data in the scatterplot below are an individual's weight and the time it takes (in seconds) on a treadmill to raise his or her pulse rate to 140 beats per minute. The o's correspond to females and the +'s to males.
A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 925 hours. A random sample of 39 light bulbs has a mean life of 905 hours with a standard deviation o 55 hours.
Suppose it costs $2,500 to buy a defibrillator. Find the expected value of owning a defibrillator if there is a 4% probability that "Silver's Gym" will lose a lawsuit regarding its operation, with each lawsuit resulting in "Silver's Gym" being lia..
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