Will a fluoride mouthwash used after brushing reduce cavities? Twenty sets of twins were used to investigate this question. One member of each set of twins used the mouthwash after brushing, and the other did not. After six months, the difference in the number of cavities for those using the mouthwash was compared with the number of cavities for those who did not use the mouthwash. This experiment uses: a. a matched pairs design. b. double replication. c. random placeboes. d. double blinding.
Will a fluoride mouthwash used after brushing reduce cavities? Twenty sets of twins were used to investigate this question. One member of each set of twins used the mouthwash after brushing, and the other did not. After six months, the difference in the number of cavities for those using the mouthwash was compared with the number of cavities for those who did not use the mouthwash. This experiment uses: a. a matched pairs design. b. double replication. c. random placeboes. d. double blinding.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 10CYU
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Question
Will a fluoride mouthwash used after brushing reduce cavities? Twenty sets of twins were used to investigate this question. One member of each set of twins used the mouthwash after brushing, and the other did not. After six months, the difference in the number of cavities for those using the mouthwash was compared with the number of cavities for those who did not use the mouthwash. This experiment uses:
| a. |
a matched pairs design.
|
|
| b. |
double replication.
|
|
| c. |
random placeboes.
|
|
| d. |
double blinding.
|
In a large population of college-educated adults, the mean IQ is 112 with standard deviation 50.62. Suppose 30 adults from this population are randomly selected for a market research campaign. The distribution of the sample mean IQ is:
| a. |
approximately Normal, with mean 112 and standard deviation 9.241.
|
|
| b. |
approximately Normal, with mean 112 and standard deviation 4.564.
|
|
| c. |
approximately Normal, with mean equal to the observed value of the sample mean and standard deviation 25.
|
|
| d. |
approximately Normal, with mean 112 and standard deviation 1.443.
|
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