Statistics Graphs Review Mostly Quantitative

Which of the following is a true statement about stemplots?

• Stemplots are equally useful for very small and very large data sets.

• Stemplots are useful for quantitative and categorical data sets.

• Stemplots can show symmetry, gaps, clusters, and outliers.

• Stems should be skipped only if there is no data value for a particular stem.

• Whether or not to provide a key depends on the relative importance of the data.

For which of the following variables would it be most appropriate to construct a histogram?

• Television brand

• Insect species

• Gender

• Eye color

• Phone call length

All students are required to sign up for a club. The graph shows the distribution of participation by grade level. Which of the following statements is incorrect?

• 30% of 6th graders joined the math club.

• The number of 8th graders who joined the chess club is the same as the number of 8th graders who joined the math club.

• The number of 6th graders who joined the drama club is the same as the number of 7th graders who joined the drama club.

• The percent of 8th graders who joined the math club is twice the percent of 7th graders who joined the math club.

• The percent of 6th graders who joined the chess club is the same as the percent of 8th graders who joined the drama club.

Which of the following statements is incorrect?

• Neither distribution appears to have outliers.

• The distributions have the same range.

• The distributions have the same mean.

• The data represented by this distribution is quantitative.

• The distributions do not have the same median.

A random sample of students was given five minutes to solve as many short puzzles as possible. The results by gender are displayed in the dotplots. Which of the following is a true statement?

• One distribution is roughly symmetric; the other is skewed right.

• The difference in their means is less than the difference in their medians.

• The ranges are both six.

• One distribution is uniform.

• One distribution is bimodal and the other is unimodal.

The following histogram displays the top speeds of several roller coasters. Which of the following must be true?

• The minimum and maximum top speeds are 30 mph and 100 mph respectively.

• At least 100 more roller coasters have top speeds between 70 and 80 mph than between 30 and 40 mph.

• The same number of roller coasters have top speeds between 50 and 60 mph as have top speeds between 80 and 90 mph.

• More roller coasters have top speeds between 70 and 80 than have top speeds over 80 mph.

Which of the following is greatest?

• The number of texts and e-mails in 2010.

• The number of e-mails in 2014.

• The number of texts in 2018.

• The above are all equal.

• It is impossible to answer this question without knowing the actual numbers of individual communications involved.

A business magazine plans to compare the entry-level salaries offered to twenty applicants with and without an MBA degree. Which of the following graphical displays is least appropriate?

• Side-by-side histograms

• Back-to-back stemplot

• Dotplot

• Pie chart

• All of the above displays are appropriate

Which of the following statements about histograms is true?

• Two students working with the same data set may come up with histograms that look different.

• Histograms of categorical variables can pinpoint clusters and gaps.

• Unlike other graphs, histograms axes do not need to be labeled.

• Displaying outliers is less problematic when using histograms than when using stemplots.

• Histograms are more widely used than stemplots or dotplots because histograms display the values of individual observations.

What percent of females prefer sports cars? This answer is part of what distribution?

• 0.25; conditional distribution of car type preference among people of a given gender

• 0.25; conditional distribution of gender among people with a particular car type preference

• 0.188; marginal distribution of gender

• 0.188; marginal distribution of car type preference