(1 point) The following random sample was selected from a normal distribution with standard deviation 4. 18 10 6 18 11 14 5 10 14 16 (a) Construct a 90% confidence interval for the population mean /. SUS (b) Construct a 95% confidence interval for the population mean /. SUS(1 point) Periodically, the county Water Department tests the drinking water of homeowners for contaminants such as lead and copper. The lead and copper levels in water specimens collected in 2008 for a sample of 10 residents of a subdevelopement of the county are shown below. lead (ug/L) copper (mg/L) 0 0.874 3.3 0.686 1.4 0.795 5.8 0.211 2.5 0.739 5.6 0.006 3 0.482 2.2 0.458 4.2 0.052 0.9 0.713 Assume that both the lead and copper levels follow a normal distribution with standard deviation 1.45 ug/L and 0.217 mg/L respectively. (a) Construct a 99% confidence interval for the mean lead level in water specimans of the subdevelopment. (b) Construct a 99% confidence interval for the mean copper level in water specimans of the subdevelopment. SUSPrevious Problem Problem List Next Problem (1 point) The ability of lizards to recognize their predators via tongue icks can often mean life or death for lizards. Seventeen juvenile common lizards were exposed to the chemical cues of the viper snake. Their responses, in number of tongue flicks per 20 minutes, are presented below. 574, 744, 200, 370, 268, 489, 642, 370, 353, 557, 523, 505, 591, 251, 778, 659, 778 a) Preliminary data analyses indicate that you can reasonably apply the z-interval procedure. Find a 90% condence interval for the mean number of tongue icks per 20 minutes for all juvenile common lizards. Assume a population standard deviation of 190.0. Note: The sum of the data is 3653. Confidence interval: ( , ). b) Which of the following is the correct interpretation for your answer in part (a)? 0A. We can be 90% confident that the mean number of tongue flicks per 20 minutes for this sample of 17 lizards lies in the interval 0 B. We can be 90% confident that the mean number of tongue flicks per 20 minutes for alljuvenile common lizards lies in the interval 0 C. There is a 90% chance that the mean number of tongue icks per 20 minutes for all juvenile common lizards lies in the interval 0 D. None of the above