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Working Hours TV time per week (minutes) 7 70 26 56 7 73 2 65 1 84 1 82 2 68 4 72 7 72

Working HoursTV time per week (minutes)
770
2656
773
265
184
182
268
472
772
2854
3054
475
463
180
664
183
663
270
1052
855
1055
874
1860
1968
1762
1570
1664
2066
2164
2162
1375
1460
1576
1460
1254
1360
1560
1460
1575
1152
1375
1153
1454
1255
1454
1360
1152
2260
2160
472
2256
464
3453
462
3253

A researcher wishes to draw a histogram in presenting graphical summaries of the data on the two main variables concerned - daily TV time in minutes and number of working hours, as stored in 'worktime' worksheet.

1. She decided to use 7 class intervals to construct a histogram for each variable. Explain how the researcher could have decided in using 7 as the number of class intervals to be used.

2. The researcher specified class intervals 0 < X ≤ 5, 5 < X ≤ 10, ..., 30 < X ≤ 35 for the weekly working hours variable. She then specified class intervals 50 < X ≤ 55, 55 < X ≤ 60, ..., 80 < X ≤ 85 for the TV time variable. Explain how the researcher could have decided on the width of each class for these class intervals on each of the two variables.

3.Using Excel, draw and display the histogram for the working hours variable using the class intervals specified in part (b). Comment on the shape of the distribution of the data set as displayed in the histogram.

4. Using Excel, draw and display the histogram for the TV time variable using the class intervals specified in part (b). Comment on the shape of the distribution of the data set as displayed in the histogram.

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