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No. & Date Asked  Question 

# 947 :: 4/29/12

Workers in 2 different mine groups were asked what they considered to be the most important labourmanagement problem. In Group A, 200 out of a random. . .
2proportion test 
# 795 :: 8/13/09

Data from the MTF 2006 survey reveal that 71.5% (432 out of 604) of males and 74% (562 out of 756) of females reported trying alcohol. You wonder whe. . .
2proportion test 
# 782 :: 7/14/09

A 20minute consumer survey mailed to 500 adults aged 25–34 included a $5 Starbucks gift certificate.
The same survey was mailed to 500 adults aged 2. . .
2proportion test 
# 662 :: 3/23/09

I need the formula to calculate zscore. My input is: Base Sample Size, Target Sample Size, Base Proportion, Target Proportion. I have a calculator . . .
2proportion test 
# 555 :: 12/14/08

Complete the following:
a. Select a variable. Compare the mean of the variable for a sample of 30 for one group with the mean of the variable for a . . .
2sample ttest,
2proportion test,
2sample ztest,
ztest 
# 537 :: 12/6/08

Can people really identify their favorite brand of cola? Volunteers tasted CocaCola Classic, Pepsi, Diet Coke, and Diet Pepsi, with the results shown. . .
2proportion test,
ChiSquare 
# 525 :: 11/28/08

Does lovastatin (a cholesterollowering drug) reduce the risk of heart attack? In a Texas study,
researchers gave lovastatin to 2,325 people and an i. . .
2proportion test,
Normal Approximation to Binomial 
# 515 :: 11/19/08

I run various A/B Split tests online. I always set all my tests for 10,000 visitors so page A and B are each equally rotated 5,000 times. My problem. . .
2proportion test,
Normal Approximation to Binomial ,
Power,
A/B Testing 
# 456 :: 10/4/08

I am trying to find out if a difference between two response sets is significant. I asked 98 boys what modalities they thought were attractive to girl. . .
2proportion test 
# 388 :: 9/17/08

In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made. . .
2proportion test,
Binomial Probability,
Normal Approximation 
# 376 :: 9/10/08

What statistical tests can I perform to compare two groups asked the same question, when the question has a yes/no answer and the sample groups are di. . .
2proportion test 
# 368 :: 9/5/08

in a random sample of 200 person of a town 120 are found to the tea drinker.In a random sample of 500 person of another town 240 are found to be tea d. . .
Normal Approximation,
2proportion test,
Binomial Probability 
# 314 :: 8/5/08

I am doing A/B testing on an ecommerce web site. I have been working on rule of thumb of 500 vistors through each page or 50 conversions on one of the. . .
2proportion test,
A/B Testing 