QMB 3250 EXAM 1 WITH 100% CORRECT
SOLUTIONS!!
Graphs for 1 Categorical Variable
Pie Charts and Bar Charts
2 Categorical Variables
Contingency Table
Graph for 1 Quantitative Variable
Histograms, Dot Plots, Stem and Leaf Plots, Box Plot
Graphs for 2 Quantitative Variables
Scatterplot
Graphs for 1 Quantitative Variable with Multiple Categories
Boxplots
Residual
residual = observed value - predicted value
Correlation Coefficient
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
, File -- New -- Data Table -- Insert Data -- Analyze -- Distribution -- Drag Column Required --
Stack (Small tab next to Distribution)
Find Test Statistic for Significance Test
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?
Help -- Sample Data -- Teaching Scripts -- Interactive Teaching Modules -- Distribution
Calculator -- Central Probability -- Probability: 0.95
Skewed Right
mean > median
Normal/Symmetric
mean = median
Skewed Left
mean < median
One mean sample statistic symbol
ȳ
One mean population parameter symbol
μ
Two sample means: independent samples; sample statistic symbol
SOLUTIONS!!
Graphs for 1 Categorical Variable
Pie Charts and Bar Charts
2 Categorical Variables
Contingency Table
Graph for 1 Quantitative Variable
Histograms, Dot Plots, Stem and Leaf Plots, Box Plot
Graphs for 2 Quantitative Variables
Scatterplot
Graphs for 1 Quantitative Variable with Multiple Categories
Boxplots
Residual
residual = observed value - predicted value
Correlation Coefficient
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
, File -- New -- Data Table -- Insert Data -- Analyze -- Distribution -- Drag Column Required --
Stack (Small tab next to Distribution)
Find Test Statistic for Significance Test
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?
Help -- Sample Data -- Teaching Scripts -- Interactive Teaching Modules -- Distribution
Calculator -- Central Probability -- Probability: 0.95
Skewed Right
mean > median
Normal/Symmetric
mean = median
Skewed Left
mean < median
One mean sample statistic symbol
ȳ
One mean population parameter symbol
μ
Two sample means: independent samples; sample statistic symbol
