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Question: A random sample of 100 teenagers was surveyed, and the mean number of songs that they had downloaded from the iTunes store in the past month was 9.4 with the results considered accurate is within 1.4 (18 times out of 20).
a. What percent of confidence level is the result?
b. What is the margin of error?
c. What is the confidence interval? Explain.
Egyptians watch an average of 2.5 hours of television per person per day. If the standard deviation for the number of hours of television watched per day is 1.6 and a random sample of 225 Egyptians is selected, the mean of this sample belongs to a..
Discuss at least three reasons why these predictions may not be accurate and offer three ways in which you can increase the likelihood of accurately predicting your customers' purchases.
Next morning, he came to work at 8:00 and began to make calls. By 11:00 a.m., his survey was done. Don't discuss what is not said. Discuss what is wrong with what is said.
At the present time, the warehouse is 40 feet deep. How many feet of depth should be added on the warehouse to minimize the annual inventory costs?
Compare and contrast the PLO/Fatah with Hamas. How do they compare to other secular nationalist and fundamentalist groups under review in this class.
Historically, it is known that the score has a Normal distribution and a standard deviation of 180. Set up the null hypothesis and the alternative hypothesis. Calculate the test statistic and find the p-value.
What are common practices in writing literature reviews to avoid because they are forms of plagiarism? What should be done instead? How would you organize your literature before writing a lit review?
1.an experiment compares yields for six different types of alfalfa. each type was planted in four different plots. the
in a manufacturing process a random sample of 36 bolts manufactured has a mean length of 1.71 inches with a standard
Draw a picture of the density function of X, and use it to illustrate the probabilities that you found in parts (c) and (d).- What is the expected value of X? This was not covered in the text, so explain your reasoning.
Two six-sided (balanced) dice are thrown. Find the probabilities of only 2, 3, or 4 appear on both dice; - the value of the second roll subtracted from the value of the first roll is 2;
consider the minitab output shown below.two sample t-test and cisamplenmeanstdevse
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