STA 6126 – Exam 1 – Fall 2010
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True or false
Q.1. A researcher is interested in subjects’ reactions to a new type of snack food. She has them rate the
likelihood of purchasing the snack food after tasting it. The choices are: Very Unlikely, Unlikely, Likely, and
Very Likely. This response is best described as Ordinal.
Q.2. If a distribution of measurements is skewed to the right, the median will be larger than the mean.
Q.3. Sampling error refers to the fact that numeric measures based on random samples do not equal the same
numeric measure based on the entire population.
Q.4. All else being the same, the width of a 95% Confidence Interval for a population mean will be wider than
the width of a 99% Confidence Interval.
Q.5. The standard error of the sample mean based on samples of size n=100, will be twice as large as the
standard error of the sample mean based on samples of size n=400.
Q.6. A news agency reports that based on a random sample of likely voters, 38% favor Candidate A in the
upcoming election, with a margin of error of ± 3.5%
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 Spring '08
 YESILCAY
 Normal Distribution, Standard Deviation

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