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Chapter 10: Q. 50 (page 598)
What can you conclude about the two operating systems?
there's no sufficient evidence to reject the null hypothesis so the data will not show ashas few failure system than
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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 new WiFi range booster is being offered to consumers. A researcher tests the native range of 12 different routers under the same conditions. The ranges are recorded. Then the researcher uses the new WiFi range booster and records the new ranges. Does the new WiFi range booster do a better job?
The average worker in Germany gets eight weeks of paid vacation.
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
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?
Marketing companies have collected data implying that teenage girls use more ring tones on their cellular phones than
teenage boys do. In one particular study of 40 randomly chosen teenage girls and boys (20 of each) with cellular phones,
the mean number of ring tones for the girls was 3.2 with a standard deviation of 1.5. The mean for the boys was 1.7 with
a standard deviation of 0.8. Conduct a hypothesis test to determine if the means are approximately the same or if the girls’
mean is higher than the boys’ mean.
According to a television commercial, of dentists agree that Ultrafresh toothpaste is the best on the market.
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
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