MATH 399N Week 3 MyStatLab Quiz (Version 1)_ Rated A.

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MATH 399N Week 3 MyStatLab Quiz Solutions (Version 1) 1. Question: 1.1.41 Determine whether the given value is a statistic or a parameter. In a study of all 1876 professors at a college, it is fo... und that 40% own a television. 2. Question: 1.2.6 Determine whether the following statement is true or false. If it is false, rewrite it as a true statement. Data at the ratio level cannot be put in order. 3. Question: 1.2.33 What is an inherent zero? Describe three examples of data sets that have inherent zeros and three that do not. 4. Question: 1.3.25 Identify the sampling techniques used, and discuss potential sources of bias (if any). Explain. Assume athe population of interest is the student body at a university. Questioning students as they leave a university parking lot, a researcher asks 385 students about their dating habits. 5. Question: 2.2.7 Match the plot with a possible description of the sample. 6. Question: 2.2.17 Use a stem-and-leaf plot to display the data. The data represent the heights of eruptions by a geyser. What can you conclude about the data? 101 90 110 150 140 120 100 130 110 108 118 100 96 107 109 120 110 130 97 121 7. Question: 2.4.15 The ages (in years) of a random sample of shoppers at a gaming store are shown. Determine the range, mean, variance and standard deviation of the sample data set. 12, 17, 23, 13, 16, 17, 19, 16, 15, 15 8. Question: The mean value of land and buildings per acre from a sample of farms is $1400, with a standard deviation of $100. The data set has a bell-shaped distribution. Using the empirical rule, determine which of the following farms, whose land and building values per acre are given, are unusual (more than two standard deviations from the mean). Are any of the data values very unusual (more than three standard deviations from the mean)? $1410 $1646 $1275 $1000 $1449 $1275 9. Question: 9.1.15 Suppose the scatter plot shows the results of a survey of 30 randomly selected males ages 24 to 35. Using age as the explanatory variable, choose the appropriate description for the graph. Explain your reasoning. Age and body temperature … balance on student loans Age and income Age and height 10. Question: 9.2.11 Match the description below its symbol(s). The mean of the y-values 11. Question: Find the equation of the regression line for the given data. Then construct a scatter plot of the data and draw the regression line. (The pair of variables have significant correlation.) Then use the regression equation to predict the value of y for each of the given x-values, if meaningful. The table below shows the heights (in feet) and the number of stories of six notable buildings in a city. 12. Question: 9.3.9 Use the value of the linear correlation coefficient to calculate the coefficient of determination. What does this tell you about the explained variation of the data about the regression line? About the unexplained variation? r = 0.264 13. Question: 9.4.1 The equation used to predict college GPA (range 0-4.0) is ŷ = 0.21 + 0.52x1 + 0,002x2, where x1 is high school GPA (range 0-4.0) and x2 is college board score (range 200-800). Use the multiple regression equation to predict college GPA for a high school GPA of 3.4 and a college board score of 500. [Show More]

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