A political action committee is interested in finding out what proportion of voters will support an environmental initiative. Obtain a sample size that will ensure a margin of error of at most 0.09 for a 95 confidence interval.
Similar initiatives in the past have gotten 93 support.
A) 3 B) 93 C) 28 D) 31
Q. 2A die is rolled 22 times and the number of twos that come up is tallied. If this experiment is repeated many times, find the standard deviation for the random variable X, the number of twos.
A) 1.755 B) 2.35 C) 1.708 D) 1.748
Q. 3Which is not a measure of dispersion?
A) Range B) Standard deviation
C) Variance D) Mean
Q. 4Given that 200 people were aged between 25 and 40, approximately how many had a systolic blood pressure reading between 130 and 149 inclusive?
A) 30 B) 23 C) 46 D) 5
Q. 5True or False: In a uniform probability distribution, any random variable is just as likely as any other random variable to occur, provided the random variables belong to the distribution.
A) True B) False
Q. 6In the computation of the sample standard variance, how many degrees of freedom are there in a data set that has 15 data values?
A) 16 B) none of these C) 14 D) 15
Q. 7Given that 800 people were aged between 25 and 40, approximately how many had a systolic blood pressure reading of 140 or higher?
A) 88 B) 8 C) 11 D) 64
Q. 8According to a college survey, 22 of all students work full time. Find the standard deviation for the random variable X, the number of students who work full time in samples of size 16.
A) 2.75 B) 3.52 C) 1.66 D) 1.88
Q. 9A university's administrator wishes to estimate the proportion of graduates who have not found employment in their major field one year after graduation. Obtain a sample size that will ensure a margin of error of at most 0.
04 for a 99 confidence interval. It is deemed reasonable to presume that of those sampled, the proportion who have not found employment will be at most 0.11.
A) 406 B) 487 C) 235 D) 16
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