You may use technology to answer these questions. However, zero credit will be given for a correct answer without a clear explanation of the method you used to find it, including a diagram or graph, if it is necessary.

1. A cell phone company wants to draw a sample of 600 customers to gather opinions about potential new features on upcoming phone models. The company draws a random sample of 200 customers who own l-phones, a random sample of 100 customers who own I.G. phones, a random sample of 100 customers who own Samsung phones and a random sample of 200 customers who own other brands of phones. The company uses this combined sample as their survey. What type of sample have they used for their survey. Table 1 59 61 66 71 83 84 85 86 88 88 88 88 89 89 90 90 90 90 90 91 91 91 92 92 92 92 92 93 93 93 93 94 94 94 101 101 103 95 95 96 96 96 97 99 99 99 99 99 105 82 86 94 105 83 88 89 90 94 99 116