Chi Square

Why do we have a control group in an experiment?

• baseline of comparison
• reduce bias
• reduce variability
• increase consistency

The purpose of randomization is to reduce

• blinding
• bias
• confounding
• variability

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

A national survey in England was done to find the type of gifts grandparents were likely go purchase for their grandchildren.  It was found that 38% bought gift certificates, 24% bought cuddly stuffed toys, and the remainder bought cinema tickets. 
The table shown above are the results from a questionaire given to a random sample of 1000 grandparents in Little Rock, Arkansas.  Is there evidence that these American grandparents buy gifts in significantly different proportions than English grandparents?

• yes, there is evidence, p value is less than .05
• no evidence, p value is less than .05
• yes, there is evidence, p value is greater than .05
• no evidence, p value is greater than .05

What is the expected value for all cells, if we assume that this is a fair six sided die?

• 96
• 16
• 8
• 1/6

Tags

CCSS.HSS.MD.A.2

CCSS.HSS.MD.A.3

CCSS.HSS.MD.B.5

The bigger the chi square statistic, the ________ the p value.

• bigger
• smaller

How many degrees of freedom will be present?

• 4
• 5
• 6
• 7

Tags

CCSS.HSS.ID.A.3

The table shows the number or babies born on each day of the week.  Is there evidence that births are more likely on specific days of the week?

• yes, the p value is greater than .05
• no evidence, the p value is less than .05
• yes, the p value is less than .05
• no evidence, the p value is greater than .05

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3

CCSS.HSS.ID.B.5

What must be true about the expected values in a chi square test?

• greater than or equal to 2
• greater than or equal to 5
• greater than or equal to 10
• greater than or equal to 30

Tags

CCSS.HSS.MD.A.2

CCSS.HSS.MD.A.3

Is the type of television show that a person chooses to watch related to the brand of deodorant that a person uses?  1500 people were surveyed.

• Chi-square Goodness of Fit Test
• Chi-Square Test for Homogeneity
• Chi-Square Test for Independence/Association
• Not a Chi-square test

Tags

CCSS.HSS.CP.A.2

CCSS.HSS.CP.A.3

CCSS.HSS.CP.A.4

CCSS.HSS.CP.B.6

CCSS.HSS.ID.B.5

Is the distribution of music that Californians listen to the same as that of Nevadans?  900 Californians and 600 Nevadans were surveyed.

• Chi-square Goodness of Fit Test
• Chi-Square Test for Homogeneity
• Chi-Square Test for Independence/Association
• Not a Chi-square test

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.ID.B.5