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State the appropriate null hypothesis H0 and alternative hypothesis Ha in each of the following cases.
(a) A study reported that 65% of students owned a cell phone. You plan to take an SRS of students to see if the percent has increased.
(b) The examinations in a large freshman chemistry class are scaled after grading so that the mean score is 78. The professor thinks that students who attend morning recitation sections will have a higher mean score than the class as a whole. Her students this semester can be considered a sample from the population of all students she might teach, so she compares their mean score with 78.
(c) The student newspaper at your college recently changed the format of their opinion page. You take a random sample of students and select those who regularly read the newspaper. They are asked to indicate their opinions on the changes using a five-point scale: -2 if the new format is much worse than the old, -1 if the new format is somewhat worse than the old, 0 if the new format is the same as the old, +1 if the new format is somewhat better than the old, and +2 if the new format is much better than the old.
The following data are the percentages of employees involved in worker participation programs in a sample of firms. Draw a stem-and-leaf display of the data.
a contractor susan meyer has to haul gravel to three building sites. she can purchase as much as 18 tons at a gravel
Let Rev be the operator that reverses the sequence of characters within a string. For example, Rev(abc) = cba. Let R be any regular expression. Rev® is the set of strings denoted by R, with each string reversed. Is Rev(R) a regular set? Why?
A group of clinicians who are members of the U.S. military are concerned with the morale of troops serving in war regions.
Identify the population and sample of interest to the researchers.- Describe the variables measured in the study as quantitative or qualitative.
a random sample of 109 light bulbs had a mean life of x558 hours with a standard deviation of o32 hours. construct a
measurement of water intake obtained from a sample of 17 rats that had been injected with a sodium chlorine solution
When Richard Stallman founded the Free Software Foundation in 1985, he was able to tap into the energy of many programmers around the world who wanted to work on a free operating system.
What is the probability of randomly selecting a member of the traveling public and finding out that he says that flight selection is not influenced.
Its war. Naval intelligence reports that 4 enemy vessels in a fleet of 21 are carrying nuclear weapons. If 6 vessels are randomly targeted and destroyed, what is the probability that at least 3 vessels transporting nuclear weapons were destroyed?
given a 90 confidence interval for mu1-mu2 as -55. what can be concluded?a nothingb mu1mu2c mu1 -5 or 5 and mu2 10 or
suppose that certain electronic components have lifetimes that are exponentially distributed fttau 1tauexp-ttaut gt 0.
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