Chi-squared practice

What is the expected value of a female who likes Pepsi?

• 10.5

• 11

• 14.5

• 6.3

Tags

CCSS.HSS.MD.B.5B

What is the

χ² _calculated value for the following situation.

• 6.65

• 6.66

• 0.00991

• 1

If the χ² _critical value = 5.99 and the

χ² _calculated value = 7.35, what is the conclusion

• Reject Ho, accept H1

• Accept Ho, reject H1

• there is not enough info to decide

• The conclusion can only be made if we also know the p-value

Tags

CCSS.HSS.IC.B.5

CCSS.HSS.ID.B.5

What is the null hypothesis?

• Injury type is independent of position played

• Injury type is dependent on the position played independent

• Injury type is correlated to position played.

Tags

CCSS.HSS.MD.B.6

CCSS.HSS.MD.B.7

What are the degrees of freedom for the following χ² test?

• 6

• 2

• 5

• 12

If we are testing at a 5% significance level and our p-value is 0.00453, what is the conclusion?

• Accept Ho

• Reject Ho

• We need to know chi-squared

• You cannot do this problem without a calculator

Testing at a 5% significance level, what are the correct rejection inequalities. (check all that apply)

• $if\ X_{calc}^2>5.99\ then\ reject\ Ho$

• $if\ X_{calc}^2<5.99\ then\ reject\ Ho$

• if p < 0.05, then reject Ho

• if p>0.05, then reject Ho

Find the chi-squared calculated value for the table.

• 0.486170447

• 1.442392006

• 1.45

• 2

Given that a student is male, what is the probability that maths is their favorite?

• 0.491

• 0.225

• 0.443

• .508

Tags

CCSS.HSS.CP.A.4

Chi-squared tests are invalid if:

• The calculated number is really large

• One of the expected values is less than 5

• One of the observed values is less than 5

• The calculated numbers is really small