Exam (elaborations)
STA270 TEST 1 QUESTIONS AND VERIFIED ANSWERS
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STA270 TEST 1 QUESTIONS AND VERIFIED ANSWERS...
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1. Give the cases and the variable(s) in each situation below, andidentify each variable as categorical or quantitative:
a). Asking US citizens whether or not they support gun control. -
ANSWER Cases: US citizens
Variable: Support gun control? (yes/no) - categorical
1. Give the cases and the variable(s) in each situation below, and
identify each variable as categorical or quantitative:
b). Asking college students how many hours of sleep they got last night.
- ANSWER Cases: College students
Variable: How much sleep last night? - quantitative
2. In each situation, indicate the explanatory variable and the response
variable.
a). Does meditation help reduce stress? - ANSWER Explanatory
variable: Meditation or not
Response variable: Some measure of stress
2. In each situation, indicate the explanatory variable and the response
variable.
b). Is hyperactivity in children affected by sugar consumption? -
ANSWER Explanatory variable: Sugar consumption
Response variable: Some measure of hyperactivity
(a) TRUE FALSE One of the goals of statistics is to use information in a
sample to draw conclusions about the population from which the sample
was taken. - ANSWER True
(b) TRUE FALSE A sample includes all individuals or objects of interest.
- ANSWER False
, (c) TRUE FALSE Roughly 25% of the values in a dataset fall between
the first and third quartiles. - ANSWER False
(d) TRUE FALSE The standard deviation is measured in the same units
as the mean. - ANSWER True
(e) TRUE FALSE The mean is less sensitive to extreme values in a
dataset than is the median. - ANSWER False
(f) TRUE FALSE If a distribution is heavily skewed to the left, the mean
will be less than the median. - ANSWER True
(g) TRUE FALSE A biased sample is one that does not accurately reflect
or represent the population. - ANSWER True
(h) TRUE FALSE Bias can occur in a survey if the participants are all
volunteers. - ANSWER True
(i) TRUE FALSE The symbol used for the population mean is - over x. -
ANSWER False
(j) TRUE FALSE For symmetric, bell-shaped data, z-scores smaller than
+2.00 would be unusual. - ANSWER False
4 . A survey results are displayed in the table below.
(Look in exam review)
In answering each of the questions below, round your answer to two
decimal places. (Show your work!)
(a) What proportion of respondents have no opinion on the theory of
evolution? - ANSWER 360/899 = 0.4004
4 . A survey results are displayed in the table below.
(Look in exam review)
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