The following histograms are based on different random...

The following histograms are based on different random samples of size 100 drawn from the same population. (a) Identify the midpoint of the class with the highest frequency in each of the three histograms. (b) Using the class midpoints, what is the range of data shown in each histogram? (c) Which of the histograms are more clearly skewed right? (d) Based on your study of random sample in Chapter 1 , is it surprising to see the variations in the samples as displayed in the histograms? The original population from which the samples were drawn is skewed right with a high frequency near 4. Do all three random samples seem to reflect these properties equally well?

The following histograms are based on different random samples of size 100 drawn from the same population.
(a) Identify the midpoint of the class with the highest frequency in each of the three histograms.
(b) Using the class midpoints, what is the range of data shown in each histogram?
(c) Which of the histograms are more clearly skewed right?
(d) Based on your study of random sample in Chapter 1 , is it surprising to see the variations in the samples as displayed in the histograms? The original population from which the samples were drawn is skewed right with a high frequency near 4. Do all three random samples seem to reflect these properties equally well?

Key Concepts

Random Sampling Variability

Random sampling variability refers to the natural differences that occur when different samples are drawn from the same population. Each random sample may exhibit slight variations in statistical measures such as frequency, range, and skewness due to chance, even if they originate from the same underlying distribution.

Population and Sample Distribution

The relationship between population and sample distributions is pivotal in statistics. While the population distribution represents the true distribution of a characteristic across an entire group, individual samples may vary due to randomness. Evaluating whether sample histograms accurately reflect the population's properties can reveal insights into sampling error and the representativeness of the data.

Skewness

Skewness is a measure of the asymmetry in the distribution of data. A right-skewed (or positively skewed) distribution has a longer tail on the right side, meaning that a bulk of the data values are concentrated on the left. Recognizing skewness in histograms helps in understanding the nature of the distribution and any potential outlier effects.

Range

The range is a measure of the spread in a dataset, determined by subtracting the smallest observed value from the largest observed value. When computed using class midpoints in a histogram, it provides an estimate of the interval over which the data are spread, offering insights into the variability within the data.

Class Midpoint

The class midpoint is the central value of a class interval in a frequency distribution. It is calculated by taking the average of the upper and lower bounds of the interval. This value is used as a representative data point for that interval, particularly when calculating statistics such as the mean or the range.

Histogram

A histogram is a graphical representation of data distribution, typically displaying frequencies of data points within specified intervals or bins. It is used to visualize the shape, spread, and central tendency of a dataset, making it easier to interpret the underlying patterns or anomalies in the data.

Transcript

00:01 So in this problem, we are interpreting histograms, and we're given histograms that are based on different random samples of size 100 drawn from the same population.

00:11 And in part a, we want to identify the midpoint of the class with the highest frequency in each of the three histograms.

00:18 So in the first histogram, this looks like it's the highest frequency.

00:27 We'll have a midpoint of about five.

00:32 For 2, the highest frequency is definitely the one that falls on 4.

00:39 And then in histogram 3, it looks like it would be about 2.

00:47 It would be the midpoint of the highest frequency bar.

00:52 And then in b, using the class midpoints, so that's all of these midpoints that are given on the x -axis.

00:58 And we want to know what the range of data is shown in each histogram.

01:01 So in b, or in histogram a, we have the range, which looks like negative .5 to about 17 .5.

01:21 And then in histogram 2, we have 1 to about 16 .5.

01:31 And then in 3, we have negative 0 .5 to 28 .5.

01:42 And then for part c, we're asked which of the histograms is clearly skewed to the right.

01:53 And just looking at them, so we can see in histogram 3 that it's skewed heavily to the left.

02:06 And we can also see that same trend in histogram 2, whereas histogram 1 seems the most evenly distributed...

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