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The average batter life of the iPhone 4S is reported to be 6.0 hours by Apple. Assume that the population standard deviation for the better life for this cell phone is 30 minutes. A random sample of 50 iPhones had an average better life of 5.7 hours. Determine the margin of error (in hours) for the 90% confidence interval for this sample.
There are 8 members on the board of directors. If the board must form a committee of 6 members, how many different ways may the committee be selected from among the 8 board members?
(a) What is the best estimate of the average obesity percentage for these countries? (Round your answer to two decimal places.) (b) The United States has an average obesity rate of 33.9%. Is this rate above average or below?
q1. the grades of 20 students are listed below. use the stem amp leaf to determine the shape of the distribution.
A psychologist interested in political behavior measured the square footage of the desks in the official office of four U.S. governors and of four chief executive officers (CEOs) of major U.S. corporations.
The U.S. trade deficit with Canada (billions of dollars) from 2000 through 2007 is reported as shown in the table. Using exponential smoothing and the smoothing constant a = 0.7, what deficit would have been forecast for 2008? Source: World Almanac..
Drug Store News (September2002) provided data on annual pharmacy sales for the leading pharmacy retailers in the United States. Show a stem-and-leaf display.
according to a survey 62 of murders committed last year were cleared by arrest or exceptional means. fifty murders
Differentiate between descriptive and inferential statistics. What information do they provide? What are their similarities and differences? Your answer should be 175 words
Explain how you obtained a suitable sample of either qualitative or quantitative data - Review data for validity and reliability.
If only one bolt is chosen, determine the probability that it will be found defective for only 1 reason (that is. it is either too large or has poor workmanship, but not both.)
twelve of the top 20 finishers in the 2009 pga championship at hazeltine national golf club in chaska minnesota used a
1. what information does calculating standard deviation provide? how is the z-score related to standard deviation?2.
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