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kingalex7575
kingalex7575
07.03.2020 • 
Mathematics

1. The student newspaper runs a weekly question that readers can answer online or by campus mail. One question was “Do you think the college is doing enough to provide student parking?” Of the 136 people who responded, 79% said “No”. The number 136 is a

(a) statistic
(b) parameter
(c) sample
(d) population

2. When a newspaper poll produces a statistic that is biased, it means that

(a) repeated polls would give results that would have no mean or median.
(b) repeated polls give results that would not yield a normal distribution.
(c) repeated polls would give results that are very similar to the population.
(d) repeated polls would miss the truth about the population in the same direction.

3. A newspaper in a small town asks an SRS of 250 citizens, “Do you favor a law banning lawn mowing after 8 pm?” Suppose that 30% of all citizens favor the law. If we took a very large number of SRSs of size n = 250 from this population, the sampling distribution of the sample proportion pˆ would have which of the following characteristics?

(a) Mean 0.35, standard deviation 0.03, shape unknown.
(b) Mean 0.30, standard deviation 0.03, approximately normal.
(c) Mean 0.30, standard deviation 0.03, shape unknown.
(d) Mean 0.35, standard deviation 0.03, approximately normal.

5. The central limit theorem can be used to determine the shape of a sampling distribution in which of the following scenarios?

(a) for a sample proportion when the population distribution is normal.
(b) for a sample mean when the population is unknown.
(c) for a sample proportion when the population distribution is not normal.
(d) for a sample mean when the population distribution is not normal.

7. On a certain day, the national average for the cost of a gallon of gasoline is $2.71. An official at a gasoline company selects an SRS of 25 gas stations and finds an average cost of $2.74 per gallon. Which of the following statements is true?

(a) $2.74 is a statistic and $2.71 is a parameter.
(b) $2.74 is a parameter and $2.71 is a statistic.
(c) $2.74 and $2.71 are both parameters.
(d) $2.74 and $2.71 are both statistics.

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