Login

Contact Jeff

Email Updates
About
Stats Q&A
Calculators
Tutorials
Products
Home
Ask a Statistics Question
View Answered Questions
Search Questions :
Filter Questions :
1Proportion Test
1Sample Proportion Test
1Sided Test
1sample Ztest
1sample ttest
1sided Interval
1tailed test
1.5
1.5 Sigma Shift
2Way ANOVA
2proportion test
2sample ttest
2sample ztest
A/B Testing
ACT Scores
ANCOVA
ANOVA
ANOVA Summary Data
ANOVA Table
Addition Rule
Adjusted Wald
Alpha
Alternative Hypothesis
Altman ZScore
Area between
BINOMDIST
Bayes Theorem
Bell Curve
Binomial Probability
Binomial cdf
Binomial pmf
Bonferroni correction
Bootstrap
CHI 2005
CHIDIST
Calculator
Central Limit Theorem
Chebyshev's Theorem
ChiSquare
ChiSquare Distribution
ChiSquare Goodnes of Fit Test
ChiSquare Test of Independence
Choose
Cohen d
Combination
Commentary
Completion Rate
Compliment Rule
Conditional Probability
Confidence Interval around a Proportion
Confidence Intervals
Confidence Level
Continuity Correction
Continuous Data
Control Chart
Correlation
Counterbalance
Covariate
Critical Value
Curvilinear Correlation
Cycle Time
DPMO
Degrees of Freedom
Dependent Sample
Dependent Variable
Difference between means
Discount Usability
Discrete Data
Ecological correlation
Effect Size
Empirical Rule
Equal Variances
EtaSquared
Excel
Expected Value
F distribution
Fstatistic
Ftest
Factorial ANOVA
Finite Population
Five Step Hypothesis Testing
Formative Evaluation
Gage R&R
Gambler's Fallacy
Geometric Mean
Geometric Standard Deviation
Goodnees of Fit
Graph
Homogeneity of Variance
Hypothesis Test
IQ Score
Independent Sample
Independent Variable
Interaction Plot
Interquartile Range
Interval
Jakob Nielsen
Joint Probability
Law of Large Numbers
Levine test
Linear Regression
Log Transformation
Logistic Regression
Lurking Variables
MANOVA
Mann Whitney
Margin of Error
Maximum Likelihood
McNemar ChiSquare
Mean Difference
Median
Midrange
Midrange
Minitab
Mode
MonteCarlo
Multiplication Rule
Mutual Exclusive
NORMSDIST
NORMSINV
NewtonRaphson
Nomal Distribution
NonLinear Correlation
NonNormal Data
NonParametric
Normal Approximation
Normal Approximation to Binomial
Normal Curve
Normal Distribution
Normal Rule
Normal Table
Normality Assumption
Normally Distributed
Null Hypothesis
OneSided Area
OneTailed Area
OneTailed Test
Ordinal
Paired ttest
Parameter
Parametric
Pearson r
Percent Score
Percentile
Percentile Rank
Poisson
Poisson Distribution
Population Standard Deviation
Power
Probability
Probability Distribution
Probability Mass Function
Probability Plot
Problem Discovery
Process Sigma
Proportion
Publications
QFD
Qualitative Studies
Quality Level
Quartile
Random Variable
Raw Score from Zscore
Regression Analysis
Regression Equation
Regression Line
Residuals
Response Rates
SAT Scores
SPSS
Sample Size
Scatter Diagram
Scatter Plot
Seasonal Data
Sequence Effect
Sigma Level
Sign Test
Single Usability Metric
Six Sigma
Slope
Small Sample
Spearman Correlation
St Deviation
Standard Deviation
Standard Deviation of Grouped Data
Standard Deviation of the Mean
Standard Deviation on Frequency Data
Standard Error of the Mean
Standard Normal Curve
Standard Normal Distribution
Standard Score
Standardize
Statistical Model
Statistics
Steps in Hypothesis Test
Stepwise Regression
Studentt
Student’s tdistribution
T score
TDIST
TINV
Task Completion
Task Success
Task Time
Tasks
TimeSeries
Transformation
Tree Diagram
Trend Line
Trimmed Mean
Two Variances
TwoProportion Test
TwoTailed Area
Type I Error
Type II Error
UI Problems
Unequal Sample Size
Unequal Variances
Union
Units of Measure
Unusual Event
Usability
Usability Score Card
Users Needed
Variance
Wald Interval
Within Subjects
Z Long Term
Z Short Term
ZScore
ZStatistic
Zupper
Zvalue
a central university
above .10
autocorrelation
bimodal
binomial
calculating mean
coefficient of determination
collinearity
correlation coefficient
directional test
exact interval
example
invNorn
lambda
mean
nondirectional test
pchart
pvalue
sampe standard deviation
sample 2
sample variance
significant correlation
skew
skewness
statistic
t statistic
tdistribution
tscore
tstatistic
ttest
test statistic
weighted mean
x score
xbar
z score
ztest
2 Questions returned
No. & Date Asked
Question
# 516 :: 11/19/08
Given a mean score of 70, standard deviation of 15,percentile of 23.Find the Z score,T score and raw score. Please explain how to work backward on a . . .
T score
,
Percent Score
,
ZScore
# 275 :: 7/11/08
The lowest 25% of the normal distribution falls below what zscore and tscore. . .
T score
,
ZScore