Chapter 10: Q.104 (page 604)
(a) is the answer
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Use the following information to answer the next exercises: Indicate if the hypothesis test is for
a. independent group means, population standard deviations, and/or variances known
b. independent group means, population standard deviations, and/or variances unknown
c. matched or paired samples
d. single mean
e. two proportions
f. single proportion
It is believed that the average grade on an English essay in a particular school system for females is higher than for males. A random sample of females had a mean score of with a standard deviation of three, and a random sample of males had a mean score of with a standard deviation of four
In symbols, what is the random variable of interest for this test?
find the ?
Use the following information to answer the next five exercises. The mean speeds of fastball pitches from two different baseball pitchers are to be compared. A sample of 14 fastball pitches is measured from each pitcher. The populations have normal distributions. Table 10.18 shows the result. Scouters believe that Rodriguez pitches a speedier fastball.
What is the random variable?
Use the following information to answer the next five exercises. A study was conducted to test the effectiveness of a software patch in reducing system failures over a six-month period. Results for randomly selected installations are shown in Table 10.21. The “before” value is matched to an “after” value, and the differences are calculated. The differences have a normal distribution. Test at the 1% significance level.
Draw the graph of the p-value.
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