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Tess is tasked with analyzing a data set with multiple variables with various scales. To reducethe difference in scale in variables, she is following a common process called_____________ to make the observations unit-free.

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The nonzero slope coefficient test is used for a renowned financial application referred to as the capital asset pricing model (CAPM).The model y = α + βx + ɛ, is essentially a simple linear regression model that uses α and β, in place of the usual β0 and β1, to represent the intercept and the slope coefficients, respectively. Which of the following is true about the slope coefficient β, called the stock's beta? Select that apply!Multiple select question.-When β equals 0, any change in the market return leads to an identical change in the given stock return.-A stock for which β > 1 is considered more "aggressive" or riskier than the market-Measures how sensitive the stock's return is to changes in the level of the overall market-When β equals 1, any change in the market return leads to an identical change in the given stock return.

Using a large value for order k in the moving averages method is effective in a. tracking changes in a time series more quickly. b. smoothing out random fluctuations. c. providing a forecast when only the most recent time series are relevant. d. eliminating the effect of seasonal variations in the time series.

In the presence of changing variability, the estimated standard errors of the OLS estimators are inappropriate. What does this imply about using standard testing?-We should use F tests only-Standard t or F tests are not valid as they are based on these estimated standard errors.-Use standard t or F tests-We should use standard t tests only

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