Magnetic surveying is one technique used by archaeologists to determine anomalies arising from variations in magnetic susceptibility. Unusual changes in magnetic susceptibility might (or might not) indicate an important archaeological discovery. Letxbe a random variable that represents a magnetic susceptibility (MS) reading for a randomly chosen site at an archaeological research location. A random sample of120 sitesgave the readings shown in the table below.

Magnetic surveying is one technique used by archaeologists to determine anomalies arising from variations in magnetic susceptibility. Unusual changes in magnetic susceptibility might (or might not) indicate an important archaeological discovery. Letx be a random variable that represents a magnetic susceptibility (MS) reading for a randomly chosen site at an archaeological research location. A random sample of 120 sites gave the readings shown in the table below. Magnetic Susceibilily Readings, ommetergramesuzond x 106 (cmg x 106) Magnetic Number of Estimated Comment Susceptibility Readings Probabilityr \"cool\" 0 S x 5 and nq > 5 are both satised. 0 Yes, it is appropriate since the criteria n 2 100 and no 5 and no > 5 are not satised. 0 Yes, it is appropriate since n 2 30. What is the value of ,1? h: (b) Use the Poisson distribution to approximate the probability that the archaeologists will find four or fewer "hot spots.'r Hint: Use Table 4 of Appendix 11. (Round your answer to four decimal places.) :I (c) Use the P0isson distribution to apprOXImate the probability that the archaeologists will nd more than Eight "hot spots." Hint: Use Table 4 of Appendix 11. (Round your answer to four decimal places.) :I In West Texas, water is extremely important. The following data represent pH levels in ground water for a random sample of 102 West Texas wells. A pH less than 7 is acidic and a pH above 7 is alkaline. Scanning the data, you can see that water in this region tends to be hard (alkaline). Too high a pH means the water is unusable or needs expensive treatment to make it usable} These data are also available for download at the Companion Sites for this text. For convenience, the data are presented In increasing order. 1!: pH of Gmund Waner in 102 West Texas Wells 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7.1 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.4 7.4 7.4 7.4 7.4 7.4 7.4 7.4 7.4 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.6 7.5 7.6 7.6 7.6 7.6 7.6 7.6 7.6 7.7 7.7 7.7 7.7 7.7 7.7 7.8 7.8 7.8 7.8 7.8 7.9 7.9 7.9 7.9 7.9 8.0 8.1 8.1 8.1 8.1 8.1 8.1 8.1 8.2 8.2 8.2 8.2 8.2 8.2 8.2 8.4 8.5 8.6 8.7 8.8 8.8 Look at a histogram of the data using ve classes. Is the pH distribution for these wells symmetric Dr skewed? O skewed left 0 symmetric O skewed right Are lower or higher values more common? 0 lower values are more common 0 higher values are more common 0 lower and higher values are equally common Magnetic surveying is one technique used by archaeologists to determine anomalies arising from variations in magnetic susceptibility. Unusual changes in magnetic susceptibility might (or might not) indicate an important archaeological discovery. Let): be a random vanable that represents a magnetic susceptibility (MS) reading for a randomly chosen site at an archaeological research location. A random sample of 120 sites gave the readings shown in the table below. "Dool" Cl 51