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Business Stats Final Exam/27 questions with Verified Answers
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Business Stats Final Exam/27 questions with Verified Answers
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Business Stats Final Exam/27questions with Verified Answers
What type of relationship exists between X and Y if as X increases Y
increases? - - Positive
- In hypothesis tests about the population correlation coefficient, p, the null
hypothesis for a two-tailed test is - - H0: p = 0
- To calculate the critical value of the correlation coefficient one will need to
find the critical t statistic using n - _____, degrees of freedom - - 2
- What type of relationship exists between X and Y if as X increases Y
decreases? - - Negative
- What type of linear relationship appears to exist between two variables if F
(x,y) = 0.83 - - strong, positive
- In hypothesis tests about the population correlation coefficient, p, the
alternative hypothesis for a two-tailed test is - - H1: p =/ 0
- When using a simple regression equation for predicting a response
variable, ______ or predicting outside the range of observed x values, should
be approached with caution - - extrapolation
- The formula for calculating the two-tailed critical value of r, the sample
correlation coefficient is: - - r critical = t/ sqrt (t^2 + n -2)
- With the population linear model: Y = B0 + B1X + EB1 represents the - -
slope population parameter
- In statistics, a straight-line model of the relationship between two
variables, X and Y, is called a - - simple regression equation
- Which of the following sample correlation coefficient shows the strongest
association between X and Y? - - -0.95
- True or False: Once your data have been plotted on an Excel scatterplot
you can fit a regression line to the points using the Trendline option - - True
- If the sample regression equation is found to be ŷ = 10 + 2x, what is the
estimated value of Y if x =5? - - 20
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