Quiz
Chapter 9
Perguntas do quiz (5)
1The Wechsler Adult Intelligence Scale (WAIS) is the most common "IQ" test. The scale of scores is approximately Normal with mean 100 and standard deviation 15. Approximately what percentage of the IQ's are between 85 and 130? Draw and label the Normal curve and use the 68-95-99.7% rule.
- A47.5%
- B68%
- C81.5%
- D95%
2The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal with mean 266 days and standard deviation 16 days. How short are the shortest 2.5% of pregnancies? Use the 68-95-99.7% rule.
- Aless than 250 days
- Bless than 234 days
- Cless than 218 days
- Dless than 202 days
3True or False: Outliers "inflate" standard deviation.
- AVerdadeiro
- BFalso
4The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20.
Approximately what percentage of students spent between $195 and $255?- A60%
- B47.5%
- C81.5%
- D95%
5The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20.
The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. Below what value are approximately 97.5% of the students?- A$195
- B$215
- C$255
- D$275
- E$295
Informações
- Descrição
- Statistics Quiz sobre Chapter 9, criado por sarah wood em 11-02-2019.
- Autor
- sarah wood
- Idioma
- English
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