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More on determining hypotheses
State the null hypothesis H0 and the alternative hypothesis Hain each case. Be sure to identify the parameters that you use to state the hypotheses.
(a) A university gives credit in French language courses to students who pass a placement test. The language department wants to know if students who get credit in this way differ in their understanding of spoken French from students who actually take the French courses. Experience has shown that the mean score of students in the courses on a standard listening test is 26. The language department gives the same listening test to a sample of 35 students who passed the credit examination to see if their performance is different.
(b) Experiments on learning in animals sometimes measure how long it takes a mouse to ?nd its way through a maze. The mean time is 20 seconds for one particular maze. A researcher thinks that playing rap music will cause the mice to complete the maze faster. She measures how long each of 12 mice takes with the rap music as a stimulus.
(c) The average square footage of one-bedroom apartments in a new student-housing development is advertised to be 460 square feet. A student group thinks that the apartments are smaller than advertised. They hire an engineer to measure a sample of apartments to test their suspicion.
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Do the data indicate that the sleeping pill is effective at a 1% level of significance?
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Suppose the following data represent thickness between and within silicon wafers (in microns), with a target value of 14.5 microns.
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Of the 180 left-handed students, 93 reported at least one injury, and 619 of the 1716 right-handed students reported at least one injury in the same period. Calculate the 95% confidence interval for the proportion of stu- dents with at least one i..
a business major wants to determine whether the variation in advertising costs of hair salons is different from the
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Selecting a Staff Person: At a community swimming pool there are 2 managers, 8 lifeguards, 3 concession stand clerks, and 2 maintenance people. If a person is selected at random, find the probability that the person is either a lifeguard or a mana..
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