MA 450 | Unit 9 - Activity (Confidence Intervals for Slopes)

The x-variable is _____

• Row

• Score

Tags

CCSS.8.SP.A.1

The y-variable is _____

• Row

• Score

Tags

CCSS.8.SP.A.1

In your calculator, go to STAT > EDIT > 1: Edit and insert "Row" in L1 and "Score" in L2.

Then, go to STAT > CALC > 8: LinReg(a+bx).

Rounding to 2 decimal places, what is the a-value?

Tags

CCSS.HSS.ID.C.8

Rounding to 3 decimal places, what is the b-value?

Tags

CCSS.HSS.ID.C.8

Identify the LSRL equation.

• y = 85.85 – 1.517x

• SCORE = 85.85 – 1.517ROW

• SCORE-hat = 85.85 – 1.517ROW

• SCORE-hat = 85.85 – 1.517ROW-hat

Tags

CCSS.HSS.ID.C.8

Since we have a sample of 30 students, randomly assigned to a row, how many degrees of freedom will we use?

Tags

CCSS.HSS.IC.B.4

For a 95% confidence interval and 28 degrees of freedom, what is the critical t-value for our confidence interval, rounded to 3 decimal places?

*Hint: Use 2nd DISTR > 4: InvNorm(area, df).

We can find the confidence interval using our calculators.

Go to STAT > TESTS > G: LinRegTInt.

The lower bound you found, rounding to 2 decimal places is what?

The upper bound that you found, round to 2 decimal places is what?

Tags

CCSS.6.SP.B.5C