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Chapter 10: Q.116 (page 607)
The appropriate hypotheses are:
a. and
b. and
c. and
d. and
option is the answer.
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What can you conclude about the two operating systems?
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 ofrole="math" localid="1650387947130" with a standard deviation of four.
Use the following information to answer the next five exercises. A researcher is testing the effects of plant food on plant growth. Nine plants have been given the plant food. Another nine plants have not been given the plant food. The heights of the plants are recorded after eight weeks. The populations have normal distributions. The following table is the result. The researcher thinks the food makes the plants grow taller.
Is the population standard deviation known or unknown?
Use the following information to answer the next 15 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
A sample of 12 in-state graduate school programs at school A has a mean tuition of \(64,000 with a standard deviation of \)8,000. At school B, a sample of 16 in-state graduate programs has a mean of \(80,000 with a standard deviation of \)6,000. On average, are the mean tuitions different?
Two types of phone operating system are being tested to determine
if there is a difference in the proportions of system failures (crashes). Fifteen out of a random sample of 150 phones with had system failures within the first eight hours of operation. Nine out of another random sample of 150 phones with had system failures within the first eight hours of operation. is believed to be more stable (have fewer crashes) than .
What can you conclude about the two operating systems?
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