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Petcare is planning an experiment to see whether the new pet food is safe for dogs to eat.
They plan to feed some animals new food and others a food that is known to be safe, comparing their health after a period of time. In this experiment, how will you implement principles of control, randomization and replication?
A researcher had the idea that background music might enhance performance on a math test and that the effect of music might depend on whether an individual is a music lover or not.
in a group lineup of 7 models in a commercial 3 are male and 4 are female. in how many ways can you arrange 3 models in
for a population with a mean of micro 70 a score of x 62 corresponds to z -2.00. what is the population standard
A bottling company fills bottles with a mean of 500 mL of liquid, with a standard deviation of 2 mL. Quality control randomly samples 20 bottles at a time. Consider the mean volume of liquid in the sample bottles. What is the mean of the sampling ..
In a latin square experiment, with 4 different golf-ball designs (A,B,C and D); if we suppose that A is the standard golf-ball design and the other three designs are newly developed. Which statistical method must we use to compare the three new d..
Probability that a home has a swimming pool is .38. What is the probability that a randomly selected home in the city has an attached garage and a swimming pool?
Of the adults in Jefferson County, 10 percent have had CPR training. For a randomly selected group of students from this county, how large will the group have to be in order for the probability that have as a minimum one group member has had CPR t..
For the following data calculate the mean and standard deviation for the sample. Then calculate both a 95% and a 99% confidence interval for the popular mean.
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
a box contains 20 dvds 4 of which are defective. if two dvds are selected at random without replacement from this box
A hardware retailer has average sales of $64,235 with a standard deviation of $5,918 for a 12-month period. The mean monthly sales for all retailers in the chain are $59,844. Is this hardware retailer's sales significantly different from all retai..
a large tank of fish from a hatchery is being delivered to a lake. the hatchery claims that the mean length of fish in
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