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# Finding the Confidence Interval for Beta

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Given this set of data:
(x,y): (-9,10.5), (-7,18.5), (-5,22.6), (-3,27.2), (-1,31.2), (1,33), (3,44.9), (5, 49.4), (7,35), (9,27.6)

Find a 90% confidence interval for beta 2(B2) [note: this deals with the model y=B0+B1X+B2X^2+e, e is the error, e~N(0, o~^2) (where o~ is sigma, the variance)] Is there evidence of a quadratic effect in the relationship between x and y? Use a 10% level test if B2=0.

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This solution will teach you step by step how to fins a confidence interval given a set of data.

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Here are the fundamental how to solve this problem:<br>
<br>1) Looking at the equation
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<br>y=B0+B1X+B2X^2+e,
<br>It is evident that there is a quadratic relationship between the two variables - why? Because B2 is to the power of 2. In a linear model, all of ...

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

##### Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.