By
definition, a simple random sample of size n is any sample that is selected in a manner to guarantee every individual in the population has an equal chance of selection.
1.True
2.False
Q. 2Selection bias can occur if volunteers only are used in a study.
1.True
2.False
Q. 3A study is an observational study if the investigator observes the behavior of a response variable when one or more factors are manipulated.
1.True
2.False
Q. 4The entire collection of individuals or objects about which information is desired is called a sample.
1.True
2.False
Q. 5Suppose the researcher described in 2 wants to test for differences in the ratings of well-being before and after commencing the gluten-free diet. Why might a test for paired differences using the Student's T distribution not be appropriate?
A. The two measures of well-being are independent.
B. The two measures of well-being are not quantitative.
C. The distribution of differences may not be normally distributed.
D. The difference between the two measures of well-being cannot be computed.
Q. 6Suppose a researcher randomly samples 20 people who do not have celiac disease, but have chosen to stop eating gluten. The researcher obtains ratings (on a 1 to 5 scale) of overall well-being before each person stopped eating gluten, and obtains the same rating two months after each person stopped eating gluten. The researcher wants to test whether the ratings change before and after a two-month period of gluten-free eating. The data the researcher obtains can best be described as:
A. Independent
B. Paired
C. Qualitative
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