Chapter 1: Problem 2
Give a brief definition of the terms population and sample.
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Chapter 1: Problem 2
Give a brief definition of the terms population and sample.
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For the following numerical variables, state whether each is discrete or continuous. a. The length of a 1 -year-old rattlesnake b. The altitude of a location in California selected randomly by throwing a dart at a map of the state c. The distance from the left edge at which a 12 -inch plastic ruler snaps when bent sufficiently to break d. The price per gallon paid by the next customer to buy gas at a particular station
The report "Testing the Waters \(2009^{\prime \prime}\) (www nrdcorg) included information on the water quality at the 82 most popular swimming beaches in California. Thirty-eight of these beaches are in Los Angeles County. For each beach, water quality was tested weekly and the data below are the percent of the tests in 2008 that failed to meet water quality standards. Los Angeles County \(\begin{array}{llllllllll}32 & 4 & 6 & 4 & 4 & 7 & 4 & 27 & 19 & 23\end{array}\) \(\begin{array}{lll}7 & 4 & 27\end{array}\) \(\begin{array}{rrrr}6 & 4 & 4 & 7 \\\ 11 & 19 & 9 & 11\end{array}\) \(\begin{array}{rr}32 & 4 \\ 19 & 13\end{array}\) \(\begin{array}{llllllllll}19 & 13 & 11 & 19 & 9 & 11 & 16 & 23 & 19 & 16\end{array}\) \(\begin{array}{llllllllll}33 & 12 & 29 & 3 & 11 & 6 & 22 & 18 & 31 & 43\end{array}\) \(\begin{array}{llllllll}17 & 26 & 17 & 20 & 10 & 6 & 14 & 11\end{array}\) Other Counties 0 0 0 \(2 \quad 3\) 7 511 \(5 \quad 7\) \(\begin{array}{lllllll}15 & 8 & 1 & 5 & 0 & 5 & 4\end{array}\) 1 0 0 5 \(\begin{array}{lllllll}1 & 0 & 2 & 7 & 0 & 2 & 2\end{array}\) 3 3 \(\begin{array}{lllllllll}0 & 8 & 8 & 8 & 0 & 0 & 17 & 4 & 3\end{array}\) : \(\begin{array}{lll}10 & 40 & 3\end{array}\) a. Construct a dotplot of the percent of tests failing to meet water quality standards for the Los Angeles County beaches. Write a few sentences describing any interesting features of the dotplot. b. Construct a dotplot of the percent of tests failing to meet water quality standards for the beaches in other counties. Write a few sentences describing any interesting features of the dotplot. c. Based on the two dotplots from Parts (a) and (b), describe how the percent of tests that fail to meet water quality standards for beaches in Los Angeles county differs from those of other counties.
Classify each of the following variables as either categorical or numerical. For those that are numerical, determine whether they are discrete or continuous. a. Brand of computer purchased by a customer b. State of birth for someone born in the United States c. Price of a textbook d. Concentration of a contaminant (micrograms per cubic centimeter) in a water sample e. Zip code (Think carefully about this one.) f. Actual weight of coffee in a 1 -pound can
The student senate at a university with 15,000 students is interested in the proportion of students who favor a change in the grading system to allow for plus and minus grades (e.g., \(\mathrm{B}+, \mathrm{B}, \mathrm{B}-\), rather than just \(\mathrm{B}\) ). Two hundred students are interviewed to determine their attitude toward this proposed change. What is the population of interest? What group of students constitutes the sample in this problem?
Based on a study of 2121 children between the ages of 1 and 4 , researchers at the Medical College of Wisconsin concluded that there was an association between iron deficiency and the length of time that a child is bottle-fed (Milwaukee journal Sentinel, November 26, 2005). Describe the sample and the population of interest for this study.
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