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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 page before ending the test and deciding which is the best page. I assume there is more scientific way of deciding when to end the test. How is this calculated?
The cost of using the equipment is $250. The materials used in one shirt cost $10, and Gina can sell these for $15 each. How many shirts must Gina sell to break even?
He can award a bonus to 20 percent of the representatives. What is the cutoff point between those who earn a bonus and those who do not?
Define Autocorrelation in the following terms. In which type of regression is it likely to occur? What is the negative impact of autocorrelation in a regression?
An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F.
You're considering an investment in the common stock of Crisp Cookware. The stock is expected to pay a dividend of $2 a share at the end of the year (D1 = $2.00). the stock has a beta equal to 0.9.
The defective and non defective stampins proceed from the machine on a random manner. If 4 stampings are randomly collected, find The probability that almost 2 are defective.
Nancy believes that the average running time of movies is equal to 140 minutes. A sample of 4 movies was taken and the following running times were obtained. Assume the population of the running times is normally distributed.
Finally, the when large plant is built and the demand happens to be high, the net present value of the profits $800,000. Draw a decision tree.
The most important material reclaimed from beverage bottles is PET plastic. A serious impurity is aluminum, which later can clog the filters in extruders when the recycled material is used.
Indicate which of the following responses below is correct. Discuss why it is correct or discuss why standard deviation is such a valuable statistic in so many situations.
Using z-scores, a population with mean = 37 and standard deviation = 8 is standardized so that the new mean is mean = 50 and standard deviation = 10. How does an individual's z-score in the new distribution compare with his/her z-score in the orig..
Use the normal distribution of SAT critical reading scores for which the mean is 507 and the standard deviation is 121. Assume the variable x is normally distributed.
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