In a survey conducted by a reputable marketing agency, 223 of 1000 adults 19 years of age or older confessed to bringing and using their cell phone every trip to the bathroom (confessions included texting and answering phone calls). Complete parts (a) through (f) below. Click here to view the standard normal distribution table (page 1), Click here to view the standard normal distribution table (page 2), (a) What is the sample in this study? What is the population finterest? Determine the sample in this study. Select the correct choice below and, if necessary, fill in the answer box within your choice. O A. The sample is all adults. O B. The sample is all adults 19 years of age or older. O C. The sample is the adults 19 years of age or older. (Type a whole number.) O D. The sample is all adults with a cell phone. Determine the population of interest. Select the correct choice below and, if necessary, fill in the answer box within your choice. O A. The population is all adults 19 years of age or older. O B. The population is all adults with a cell phone. O C. The population is all adults. O D. The population is the adults 19 years of age or older. (Type a whole number.) (b) What is the variable of interest in this study? Is it qualitative or quantitative? The variable of interest is V This variable is V because (c) Based on the results of this survey, obtain a point estimate for the proportion of adults 19 years of age or older who bring their cell phone every trip to the bathroom. (Round three decimal places as needed.)
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
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