A method of gathering data when people are asked a series of questions that can be administered by e-mail, via the Web, face-to-face or over the telephone, is known as _________.
A) direct observation
B) focus groups
C) experiments
D) surveys
Q. 2Using n 1 in the denominator for the sample variance is a much better estimate of the true population variance when compared to dividing by n.
Indicate whether the statement is true or false
Q. 3Choose a pie chart rather than a bar chart if you want to highlight the actual data values and when the classes combined don't form a whole.
Indicate whether the statement is true or false
Q. 4The sum of all the probabilities for the simple events in the sample space must be equal to 1.
Indicate whether the statement is true or false
Q. 5A method of gathering data when subjects are exposed to certain treatments and the data of interest is recorded is known as ____________.
A) direct observation
B) focus groups
C) experiments
D) surveys
Q. 6The standard deviation of a data set can never be negative.
Indicate whether the statement is true or false
Q. 7The main drawback to using secondary data is that _______________________.
A) it may be expensive to obtain the data
B) the subjects of interest need to be directly observed to collect the data
C) the subjects of interest are paid to provide the data
D) you have no control over how the data were collected
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