13. [0.66/1 Points] DETAILS PREVIOUS ANSWERS MENDSTAT15 1.4.027. MY NOTES ASK YOUR TEACHER PRACTICE ANOT To decide on the number of service counters needed for stores to be built in the future, a supermarket chain gathered information on the length of time (in minutes) required to service customers using a sample of 60 customers' service times, that are shown here. 3.0 0.3 0.9 0.9 0.5 1.2 1.2 0.2 2.2 0.9 1.1 0.9 1.4 2.7 4.6 03 10 1.3 0.4 0.5 2.4 0.7 0.6 0.8 3.2 0.9 1.0 1.0 0.7 1.7 0.8 1.3 1.4 0.6 0.7 1.7 1.5 5.1 1.6 1.8 2.3 3.7 0.5 1.7 0.1 1.2 0.4 1.5 1.7 1.1 1.8 1.8 0.6 0.9 1.5 1.2 (a) Construct a relative frequency histogram for the supermarket service times. 0.3 Relative Frequency Relative Frequency Relative Frequency 0.2 Relative Frequency 0.10 0.1 0.05 0.05 0 0.5 1 1.5 2 25 3 3.5 45 5 0 05 1 1.5 2 25 3 3.5 4 45 5 6 05 15 2 25 3 3.5 4 45 6 05 1 1.5 2 25 3 3.5 4 45 O Length of Time (minutes) O Length of Time (minutes) Length of Time (minutes) Length of Time (minutes) (b) Describe the shape of the distribution. Do you see any outliers? The distribution is skewed to the left, with no unusually small or large observations. The distribution is skewed to the left, with several unusually small observations. The distribution is symmetric, with several unusually small and large observations. O The distribution is skewed to the right, with several unusually large observations. The distribution is skewed to the left, with several unusually large observations. (c) Assuming that the outliers in this data set are valid observations, how would you explain them to the management of the supermarket chain? This answer has not been graded yet.16. [0.66/1 Points] DETAILS PREVIOUS ANSWERS MENDSTAT15 1.4.032. MY NOTES ASK YOUR TEA The self-reported heights of 105 students in a blostatistics class are described in the relative frequency histogram below. 10/105 Relative Frequency 5/105 60 63 66 69 72 Heights (a) Describe the shape of the distribution. O The data is somewhat mound-shaped. O The data is skewed to the left O The data is skewed to the right. (b) Do you see any unusual feature in this histogram? It appears to have a local peak at each edge-high points from which the frequencies drop off between the peaks. O There is one high peak on the right side of the histogram-a high point from which the frequencies drop off on the left side. O There is one high peak on the left side of the histogram-a high point from which the frequencies drop off on the right side. It appears to have two local peaks near the center-high points from which the frequencies drop off on either side. (c) Can you think of an explanation for the two peaks in the histogram? Is there some other factor that is causing the heights to mound up in two separate peaks? What is it? This answer has not been graded yet. Need Help? Read it Watch It