http://www.ck12.org Chapter 1. An Introduction to Analyzing Statistical Data
c. II, III, I
d. II, I, III
e. It is not possible to determine the correct answer.- On the first day of school, a teacher asks her students to fill out a survey with their name, gender, age, and
homeroom number. How many quantitative variables are there in this example?
a. 0
b. 1
c. 2
d. 3
e. 4 - You collect data on the shoe sizes of the students in your school by recording the sizes of 50 randomly selected
males’ shoes. What is the highest level of measurement that you have demonstrated?
a. nominal
b. ordinal
c. interval
d. ratio - Which of the following represents a true statistical experiment?
a. Researchers collect temperatures from the Arctic Ocean to determine the rate of climate change.
b. Researchers collect, tag, and release geese from Siberia to determine their migration patterns.
c. Researchers select 50 individuals who smoke 1 pack of cigarettes a day and 50 individuals who do not
smoke to test their lung capacities.
d. Researchers select 50 individuals at random. 25 are given a new drug to boost memory function, 25 are
given a water pill and told that it is medication that will help their memories (a placebo). The memory
function of both groups is then tested and compared.
e. Researchers select 50 individuals at random and ask them questions about their diet. Each individual’s
physical fitness is then tested and compared to determine if there is a relationship between diet and
health. - According to a 2002 study, the mean height of Chinese men between the ages of 30 and 65 is 164.8 cm with
a standard deviation of 6.4 cm (http://aje.oxfordjournals.org/cgi/reprint/155/4/346.pdf accessed Feb 6, 2008).
Which of the following statements is true based on this study?
a. The interquartile range is 12.8 cm.
b. All Chinese men are between 158.4 and 171.2 cm.
c. At least 75% of Chinese men between 30 and 65 are between 158.4 and 171.2 cm.
d. At least 75% of Chinese men between 30 and 65 are between 152 and 177.6 cm.
e. All Chinese men between 30 and 65 are between 152 and 177.6 cm. - Sampling error is best described as:
a. The unintentional mistakes a researcher makes when collecting information.
b. The natural variation that is present when you do not get data from the entire population.
c. A researcher intentionally asking a misleading question hoping for a particular response.
d. When a drug company does their own experiment that proves their medication is the best.
e. When individuals in a sample answer a survey untruthfully. - If the sum of the squared deviations for a sample of 20 individuals is 277, the standard deviation is closest to:
a. 3. 82
b. 3. 85
c. 13. 72
d. 14. 58
e. 191. 82