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1.One element in the dotplot above is labeled X. Which of the statements below is true?
(A) X has the smallest z-score, in absolute value, of any element in the set.
(B) X has the largest z-score, in absolute value, of any element in the set.
(C) X has the smallest value of any element in the set.
(D) A boxplot will plot X as an isolated point.
(E) A back-to-back stemplot will show two symmetric clusters.
2.The histogram shown above might correspond to which of the boxplots below?
(A)
(B)
(C)
(D)
(E)
3.All students at a private middle school are required to sign up for one of the three clubs: chess, drama, or math. The graph below shows the distribution of participation by grade level.
Which of the following statements is incorrect?
(A) 30 percent of the 6th graders joined the math club.
(B) The number of 8th graders who joined the chess club is the same as the number of 8th graders who joined the math club.
(C) The number of 6th graders who joined the drama club is the same as the number of 7th graders who joined the drama club.
(D) The percent of 8th graders who joined the math club is twice the percent of 7th graders who joined the math club.
(E) The percent of 6th graders who joined the chess club is the same as the percent of 8th graders who joined the drama club.
4.Which of the following is a true statement about stemplots?
(A) Stemplots are equally useful for small and for very large data sets.
(B) Stemplots are useful both for quantitative and for categorical data sets.
(C) Stemplots can show symmetry, gaps, clusters, and outliers.
(D) Stems should be skipped only if there is no data value for a particular stem.
(E) Whether or not to provide a key depends on the relative importance of the data.
5.Which of the following is incorrect?
(A) In histograms, frequencies can be determined from relative heights.
(B) In histograms, relative areas correspond to relative frequencies.
(C) Boxplots, dotplots, stemplots, and histograms can all show skewness.
(D) Sets with different distribution shapes can have identical boxplots.
(E) Both dotplots and stemplots can show symmetry, gaps, clusters, and outliers.
6.If three stations are selling gas for $2.10 per gallon, six are selling gas for $2.05 per gallon, and ten are selling gas for $2.00 per gallon, what is the median price per gallon among these stations?
(A) $2.00
(B) $2.025
(C) $2.0316
(D) $2.05
(E) $2.075
7.Suppose the average score of a national exam is 1,000 with a standard deviation of 200. If each score is increased by 50 and then each result is increased by 5 percent, what are the new mean and standard deviation?
(A) μ = 1,100 and σ = 200
(B) μ = 1,100 and σ = 210
(C) μ = 1,102.5 and σ = 200
(D) μ = 1,102.5 and σ = 210
(E) μ = 1,102.5 and σ = 212.5
8.For which of the following variables would it be most appropriate to construct a histogram?
(A) Television brand
(B) Insect species
(C) Gender
(D) Eye color
(E) Phone call length
9.If the standard deviation of a set of observations is 0, you can conclude
(A) that a mistake in arithmetic has been made
(B) that there is no relationship among the observations
