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Showing of 13 Questions
No. & Date AskedQuestion
# 947 :: 4/29/12
Question 947 has been Answered
Workers in 2 different mine groups were asked what they considered to be the most important labour-management problem. In Group A, 200 out of a random. . .

2-proportion test

# 795 :: 8/13/09
Question 795 has been Answered
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. . .

2-proportion test

# 782 :: 7/14/09
Question 782 has been Answered
A 20-minute 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. . .

2-proportion test

# 662 :: 3/23/09
Question 662 has been Answered
I need the formula to calculate z-score. My input is: Base Sample Size, Target Sample Size, Base Proportion, Target Proportion. I have a calculator . . .

2-proportion test

# 555 :: 12/14/08
Question 555 has been Answered
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 . . .

2-sample t-test, 2-proportion test, 2-sample z-test, z-test

# 537 :: 12/6/08
Question 537 has been Answered
Can people really identify their favorite brand of cola? Volunteers tasted Coca-Cola Classic, Pepsi, Diet Coke, and Diet Pepsi, with the results shown. . .

2-proportion test, Chi-Square

# 525 :: 11/28/08
Question 525 has been Answered
Does lovastatin (a cholesterol-lowering drug) reduce the risk of heart attack? In a Texas study, researchers gave lovastatin to 2,325 people and an i. . .

2-proportion test, Normal Approximation to Binomial

# 515 :: 11/19/08
Question 515 has been Answered
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. . .

2-proportion test, Normal Approximation to Binomial , Power, A/B Testing

# 456 :: 10/4/08
Question 456 has been Answered
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. . .

2-proportion test

# 388 :: 9/17/08
Question 388 has been Answered
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. . .

2-proportion test, Binomial Probability, Normal Approximation

# 376 :: 9/10/08
Question 376 has been Answered
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. . .

2-proportion test

# 368 :: 9/5/08
Question 368 has been Answered
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, 2-proportion test, Binomial Probability

# 314 :: 8/5/08
Question 314 has been Answered
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. . .

2-proportion test, A/B Testing