QMB 3250 Exam UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
Graphs for 1 Categorical Variable - CORRECT ANSWER Pie Charts and Bar Charts
2 Categorical Variables - CORRECT ANSWER Contingency Table
Graph for 1 Quantitative Variable - CORRECT ANSWER Histograms, Dot Plots, Stem and
Leaf Plots, Box Plot
Graphs for 2 Quantitative Variables - CORRECT ANSWER Scatterplot
Graphs for 1 Quantitative Variable with Multiple Categories - CORRECT ANSWER Boxplots
Residual - CORRECT ANSWER residual = observed value - predicted value
Correlation Coefficient - CORRECT ANSWER a statistical index of the relationship between
two things (from -1 to +1); can be found by taking the square root of r-squared and then determine
sign from graph
JMP Standard Deviation - CORRECT ANSWER File -- New -- Data Table -- Insert Data --
Analyze -- Distribution -- Drag Column Required -- Stack (Small tab next to Distribution)
Find Test Statistic for Significance Test - CORRECT ANSWER Enter two columns of data --
Analyze -- Specialized Modeling -- Matched Pairs -- Drag each column into Y, Paired Response -- OK
-- t-Ratio **
What value of t would you use for 95% confidence interval for μd? - CORRECT
ANSWER Help -- Sample Data -- Teaching Scripts -- Interactive Teaching Modules --
Distribution Calculator -- Central Probability -- Probability: 0.95
Skewed Right - CORRECT ANSWER mean > median
, Normal/Symmetric - CORRECT ANSWER mean = median
Skewed Left - CORRECT ANSWER mean < median
One mean sample statistic symbol - CORRECT ANSWER ȳ
One mean population parameter symbol - CORRECT ANSWER μ
Two sample means: independent samples; sample statistic symbol - CORRECT ANSWER ȳ1 -
ȳ2
Two sample means: independent samples; population parameter symbol - CORRECT
ANSWER μ1 - μ2
Two sample means: matched pairs; sample statistic symbol - CORRECT ANSWER ȳd
Two sample means: matched pairs; population parameter symbol - CORRECT ANSWER μd
One proportion; sample statistic symbol - CORRECT ANSWER p̂
One proportion; population parameter symbol - CORRECT ANSWER p
Two independent proportions sample statistic - CORRECT ANSWER p̂1 - p̂2
Two independent proportions population parameter - CORRECT ANSWER p1 - p2
Matched pairs/dependent samples - CORRECT ANSWER same people or things are used in
both samples; find the individual differences and treat paired samples as 1 sample problem
QUESTIONS AND CORRECT ANSWERS
Graphs for 1 Categorical Variable - CORRECT ANSWER Pie Charts and Bar Charts
2 Categorical Variables - CORRECT ANSWER Contingency Table
Graph for 1 Quantitative Variable - CORRECT ANSWER Histograms, Dot Plots, Stem and
Leaf Plots, Box Plot
Graphs for 2 Quantitative Variables - CORRECT ANSWER Scatterplot
Graphs for 1 Quantitative Variable with Multiple Categories - CORRECT ANSWER Boxplots
Residual - CORRECT ANSWER residual = observed value - predicted value
Correlation Coefficient - CORRECT ANSWER a statistical index of the relationship between
two things (from -1 to +1); can be found by taking the square root of r-squared and then determine
sign from graph
JMP Standard Deviation - CORRECT ANSWER File -- New -- Data Table -- Insert Data --
Analyze -- Distribution -- Drag Column Required -- Stack (Small tab next to Distribution)
Find Test Statistic for Significance Test - CORRECT ANSWER Enter two columns of data --
Analyze -- Specialized Modeling -- Matched Pairs -- Drag each column into Y, Paired Response -- OK
-- t-Ratio **
What value of t would you use for 95% confidence interval for μd? - CORRECT
ANSWER Help -- Sample Data -- Teaching Scripts -- Interactive Teaching Modules --
Distribution Calculator -- Central Probability -- Probability: 0.95
Skewed Right - CORRECT ANSWER mean > median
, Normal/Symmetric - CORRECT ANSWER mean = median
Skewed Left - CORRECT ANSWER mean < median
One mean sample statistic symbol - CORRECT ANSWER ȳ
One mean population parameter symbol - CORRECT ANSWER μ
Two sample means: independent samples; sample statistic symbol - CORRECT ANSWER ȳ1 -
ȳ2
Two sample means: independent samples; population parameter symbol - CORRECT
ANSWER μ1 - μ2
Two sample means: matched pairs; sample statistic symbol - CORRECT ANSWER ȳd
Two sample means: matched pairs; population parameter symbol - CORRECT ANSWER μd
One proportion; sample statistic symbol - CORRECT ANSWER p̂
One proportion; population parameter symbol - CORRECT ANSWER p
Two independent proportions sample statistic - CORRECT ANSWER p̂1 - p̂2
Two independent proportions population parameter - CORRECT ANSWER p1 - p2
Matched pairs/dependent samples - CORRECT ANSWER same people or things are used in
both samples; find the individual differences and treat paired samples as 1 sample problem
