Question 1

A set of scores ranging from a high of 47 to a low of 6 is organized in a grouped frequency distribution table using an interval width of 5 points.If the distribution is shown in a graph,then a histogram or polygon should be used.

Accepted Answer

When using a grouped frequency distribution table with an interval width of 5 points, it is appropriate to display the distribution using a histogram or polygon on a graph. This allows the grouped data to be visualized as a frequency distribution.

Question 2

The normal distribution is an example of a symmetrical distribution.

Accepted Answer

The normal distribution is symmetric around its mean value.

Question 3

Briefly explain what information is available in a regular frequency distribution table that is not available in a grouped table.

Accepted Answer

The answer of Briefly explain what information is available in...

Question 4

A histogram is constructed so that adjacent bars touch.

Accepted Answer

A histogram is designed with adjacent bars touching to indicate the continuous nature of the data it represents, unlike a bar chart where bars are separated to show discrete categories.

Question 5

A space is left between adjacent bars in a bar graph.

Accepted Answer

A space is typically left between adjacent bars in a bar graph to visually separate the different categories or data points represented by the bars.

Question 6

If a set of exam scores forms a negatively skewed distribution,it suggests that the majority of the students did not score well on the exam.

Accepted Answer

A negatively skewed distribution means that the tail of the distribution is longer on the left-hand side (lower scores) and shorter on the right-hand side (higher scores). This suggests that there were some students who scored very low, but the majority of the students may have scored average or above average on the exam.

Question 7

A sports historian recorded the number of times that the New York Yankees finished 1^st,2^nd,3^rd,and so on,in their division for the past 20 years.If the results are presented in a frequency distribution graph,then a histogram should be used.

Accepted Answer

The answer of A sports historian recorded the number of...

Question 8

If it is appropriate to present a distribution of scores in a polygon,then it would also be appropriate to present the scores in a bar graph.

Accepted Answer

A polygon is used for continuous data, showing the distribution across different intervals, while a bar graph is more appropriate for categorical or discrete data, indicating the frequency of distinct categories.

Question 9

In a positively skewed distribution,the scores pile up on the left side of the distribution and taper off to the right.

Accepted Answer

In a positively skewed distribution, most of the data points are concentrated on the left, leading to a long tail extending to the right.

Question 10

The classrooms in the Psychology department are numbered from 100 to 108.A professor records the number of classes held in each room during the fall semester.If the results were presented in a frequency distribution graph,the professor should use a bar graph.

Accepted Answer

A bar graph is the most appropriate type of graph for presenting frequency distribution data when the data is categorical, such as numbered classrooms.

Question 11

In February in New York,the daily high temperatures are typically low with only a few relatively warm days.A frequency distribution showing the daily high temperatures would probably form a negatively skewed distribution.

Accepted Answer

A negatively skewed distribution would have more values on the high end, indicating that there are more warm days in February. However, the statement says that there are only a few relatively warm days, which implies that there are more cold days. Therefore, the distribution would likely be positively skewed, with more values on the low end.

Question 12

The scores for a very easy exam would probably form a positively skewed distribution.

Accepted Answer

For a very easy exam, most students would likely score high, leading to a clustering of scores at the higher end of the scale and a tail stretching towards the lower scores, which is characteristic of a negatively skewed distribution.

Quiz 2: Frequency Distributions