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A five-year old study claims that selling prices of new homes / condominiums in the New York area have a normal distribution with mean = $180,000
Perform hypothesis testing on one variable's data. (Choose either the intrinsic or extrinsic column.) Perform a t-test by formulating a null and an alternative
Find the standard deviation for the given data. Round your answer to one more decimal place than the original data.
The election is one week away. You think you have the election sewn up, but the seem appears to be unraveling. You run a poll, draw a random sample of 500 adult
Consider an infinite population with a normal shape and a mean of 300 and standard deviation of 30.
Here is a sample of 106 body temperatures (attached file) with a mean of 98.20 F. Assume that σ is known to be 0.62 F.
Describe the distribution of sample means based on samples of n = 16 selected from this population.
A normal distribution has a mean=60 and a standard deviation=6. Find the following probabilities:
Dr.Radman has been collecting data on a simplified intake form. One measure that was taken was the amount of time (in minutes)
DiGiorno's frozen pizza has some of the most creative and likeable advertisements on television.
When to use a t-test and when to use a z-test. How to choose between a t-test and a z-test, a one-sample test and a two-sample test, and a one-sided
I am planning my second trip to Sweden. Of course, I had read about the country and one article stated the average woman there is 69 inches
James Johnson, manager of quality control at Creative Auto Corp., just received a report from the assembly plant. The latest shipment of 200 lug bolts
A researcher is interested in studying the relationship between certain driving habits and type of vehicle. He hypothesizes that signaling behavior
A student scores 50 on a psychology exam and 83 on an economics exam. The psychology exam has a mean score of 60 and the standard deviation of 5.
Your boss has determined that on Wednesday, 5 random employees on the line to have a chance to obtain a $25 bonus if they produce more XT34's
In Dallas some fire trucks were painted yellow. During the test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents.
With regards to a standard normal distribution complete the following:
In 1999, a sample of 200 in-store shoppers showed that 42 paid by debit card. In 2004, a sample of the same size showed that 62 paid by debit card.
A statistician is going to survey a sample of 50 people. He prepared a list of 50 random phone numbers generated by a computer
Briefly explain what percentages of the cases in the normal curve you can obtain by using a z-score of 2.58 as a cutoff point.
A process is supposed to produce aluminum castings with a mean weight of 1.223 kg. The weights follow a normal distribution with known standard deviation 0.084
According to the local union president, the mean gross income of plumbers in the Salt Lake City area follows the normal probability distribution with a mean
Calculate the average student score necessary for the district to retain its federal funding. You may assume that the Standard Deviation will not change.
Difference between coke and pepsi in a blind taste test? Most people say they can and have a preference for one brand or another