Quick Check 1B State the type of measurements (nominal/ordinal/interval/ratio) for each of the following data: (a) Examination scores for Statistics. (b) Blood type. (c) Ratings given to the lecture room conditions. (d) The weights of beauty contestants. (e) Shoes size. (f) The top three bestselling car models in Malaysia. (g) Football teams ranking by FIFA. (h) Time taken to serve a customer at the post office counter. (i) The distance jumped by the athletes. Brands of electric fans. 2. State whether the following statements are true or false: (a) Examination grades of A to F are nominal scales of measurements. (b) The highest scale of measurement is the interval scale. (c) Age of person is a ratio scale of measurement. (d) The ranking of the singing competitors by the judges is ordinal scale. (e) Marital status is an example of a qualitative variable. (f) The weight of a durian is considered a continuous variable. State whether each of the following variables is qualitative or quantitative. If it is quantitative identify whether it is discrete or continuous. (a) The number of students in the class. (b) Time taken to write a computer programme. (c) Computer brands exhibited at the computer fair. (d) Colours of the cars preferred by the buyers. (e) Income of the workers in a plastic manufacturing company. (f) Number of books read in a year.Quick Check 2A 1 Explain the following sampling methods. (a) Convenience sampling (b) Judgemental sampling (c) Quota sampling 2 Explain briefly the following probability sampling methods. (a) Simple random sampling (b) Systematic sampling (c) Stratified sampling (d) Cluster sampling 3 The sales manager of an electrical outlet wants to investigate the level of satisfaction among customers who purchased the refrigerators from the outlet for the past 12 months. From the sales records of 480 customers, the manager selects a random sample of 80 customers. The following table shows the number of customers for each brand of refrigerators. Brand of refrigerators Numbers of customers Philips 150 Toshiba 90 Sharp 120 JVC 40 Panasonic 80 (a) State the population of interest. (b) State the variable of interest in the study.Statistics (c) What is the sampling method used by the manager? (d) Calculate the number of customers selected as samples for each brand. (e) Describe how to select the customers for the Philips brand using systematic sampling.76 STATISTICS 2. The data in Table 3.27 represents the number of durians harvested from a farm in Tanjung Sepat over a period of 17 days in the month of July. Table 3.27 Durians harvested from a farm in Tanjung Sepat in the month of July Number of durians Day Day Number of durians 80 10 88 60 11 85 N 70 12 125 W 71 13 107 69 14 112 89 15 96 66 16 72 8 100 17 134 50 (a) Construct a stem-and-leaf plot for the above data. (b) Construct a frequency table for the data