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21) A public opinion poll surveyed a simple random sample of
21) A public opinion poll surveyed a simple random sample of voters. Respondents were classified by gender and by voting preference—Republican, Democrat, or Independent. The results follow. Voting Pre… read more
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9.Which is a time series A) The M1 component of the money
9.Which is a time series? A) The M1 component of the money supply for the U.S. (n = 20 quarters). B) The unemployment rates for the U.S. states (n = 50 states). C) The Gross Domestic Product for the E… read more
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49) The time series component that reflects variability over
49) The time series component that reflects variability over short, repetitive time periods that last less than one year is called A. seasonal variation. B. cyclical variation. C. long–term trend. D. … read more
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T F 1. Correlation analysis is a group of statistical techniques
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49) The following linear trend equation was developed for the
49) The following linear trend equation was developed for the annual sales of the Tractor Manufacturing Company. Y' = 355 + 50t (in $ thousands). How much are sales increasing by? A. $5,000 per month … read more
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49) If the least squares equation for Marys Clothing sales
49) If the least squares equation for Mary's Clothing sales data from 2004 to 2008 is represented by the equation Y' = 12 + 1.1t (in $ millions). What is the value of t and the forecast for 2010? A. t… read more
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49) If the least squares equation for Marys Clothing sales
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Section 1 1) 17” is an appropriate null hypothesis.
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25) Statistical methods that require few assumptions, if any,
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9) A test for equality of two variances is based on A.
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1) If a hypothesis test has a level of significance of 5%,
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14) A pooled proportion estimate may be used to calculate
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10) A random variable follows the Students t distribution.
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T F 7. A small number of cells with expected frequencies
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T F 1. Correlation coefficients of positive 0.91 and negative
T F 1. Correlation coefficients of positive 0.91 and negative 0.91 represent relationships between two variables that have equal strength but different directions. T F 2. If the coefficient of correla… read more
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Answer each question as either T for true of F for False
Answer each question as either T for true of F for False 1._____The moving average method averages out cyclical and irregular components. 2.____For a contingency table, the expected frequency for a ce… read more
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T F 1. Correlation coefficients of positive 0.91 and
T F 1. Correlation coefficients of positive 0.91 and negative 0.91 represent relationships between two variables that have equal strength but different directions. T F 2. If the coefficient of correla… read more
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T F 1. Correlation coefficients of positive 0.91 and negative
T F 1. Correlation coefficients of positive 0.91 and negative 0.91 represent relationships between two variables that have equal strength but different directions. T F 2. If the coefficient of correla… read more
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