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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
The known standard deviation in salary for all mid-level professionals in the financial industry is Company A and CompanyB are in the financial industry. Suppose samples are taken of mid-level professionals from Company A and from Company B. The sample mean salary for mid-level professionals in Company A is The sample mean salary for mid-level professionals in Company B is Company A and Company B management want to know if their midlevel professionals are paid differently, on average.
A study was conducted to investigate how effective a new diet was in lowering cholesterol. Results for the
randomly selected subjects are shown in the table. The differences have a normal distribution. Are the subjects鈥�
cholesterol levels lower on average after the diet? Test at the level.
| Subject | A | B | C | D | E | F | G | H | I |
| Before | 209 | 210 | 205 | 198 | 216 | 217 | 238 | 240 | 222 |
| After | 199 | 207 | 189 | 209 | 217 | 202 | 211 | 223 | 201 |
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鈥�
mean is higher than the boys鈥� mean.
What is the p-value?
It is thought that teenagers sleep more than adults on average. A study is done to verify this. A sample of 16 teenagers has a mean of 8.9 hours slept and a standard deviation of 1.2. A sample of 12 adults has a mean of 6.9 hours slept and a standard deviation of 0.6.
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