Chi-Square

62 Heads and 38 Tails. What is the EXPECTED value for Heads and Tails? 

• 62% Heads; 38% Tails

• 50% Heads; 50% Tails

• 62% Tails; 38% Heads

Recall question! In the formula above, what does the "x²" stand for?

• the variable

• the variable squared

• the unknown

• chi-square

In the formula above, what does the   stand for?

• Average

• Mean

• Sum

• Mode

In the formula above, what does the "O" stand for?

• Obtuse value

• Expected value

• Observed value

• Obligatory value

• Inferred value

Tags

CCSS.HSS.MD.A.2

In the formula above, what does the "E" stand for?

• Expedited value

• Experimental value

• Observed value

• Expected value

• Experiential Value

One more time: Degree of Freedom is n-1. So, if you have 8 different choices, what is your degree of freedom? 

• 7

• 6

• 8

• 9

• 1

The Critical Value is important - it is all the numbers below the 0.05. We will always use that since it represents 95% confidence. BUT, you will have this chart with you whenever you do a Chi Square test, so you could use other values. If your degree of freedom is 5, what is the critical value we'd use? 

• 3.84

• 12.6

• 9.48

• 11.07

Which is our null hypothesis for the coin toss?

• The coin is biased in favor of a head or tail (i.e. the probability of a head is greater than 0.5)

• The coin is fair (i.e., the probability of a head is 0.5)

• The coin is biased in favor of tails (i.e. the probability of tails is greater than 0.5)

Use his data. Tell me if you accept or reject the null hypothesis for his pillbug scenario. 

• Reject

• Accept

Tags

CCSS.6.SP.B.5C

What is the X² value you calculated?

Tags

CCSS.HSS.MD.A.2