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A normal- shaped distribution has a mean of 80 and standard deviation of 15.
a. What are the z-scores values that from the boundaries for the middle 95% of the distribution of sample means?b. Compute the z-score for M=89 for a sample of n=25 scores. Is this sample mean in the middle 95% of the distribution?
Interpreting confidence interval for the P-value. Give an appropriated response. A weight loss center provided a loss for 72% of its participants.
It does not matter, when data are skewed mean and median are the same.
Why is it necessary to study the order of operations and the laws of operations before you start solving equations? Of the three laws, commutative, associative, and distributive, which one is most frequently used in algebra? Why?
A machine is set to pump cleanser into a process at the rate of 8 gallons per minute. Upon inspection, it is learned that the machine actually pumps cleanser at a rate described by the uniform distribution over the interval 7.5 to 10.5 gallons per..
At 0.01 significance level is it sensible to conclude that modification reduced number of traffic accidents?
Which of the following is true about the expected value of perfect information. It is the amount you would pay for any sample study.
The 99% confidence interval estimate for a population variance when a sample standard deviation of 12 is obtained from a sample of 10 items is:
The mean score on a standardized psychology test is supposed to be 50. Believing that a group of psychologists will score higher, we test a random sample of 11 psychologists.
The project requires you forecast the historical data, replicating the appropriate trends, seasonalities, week-over-week variability, etc. Please refer to the chapter and materials on Forecasting for the procedures to do.
At a particular location on a river the number of fish caught per man-hour of fishing effort has a Poisson distribution with ?= 1.3 fish per man hour. Find the following probabilities:
What is the conditional probability that the down time is longer than 236 days given that it is already longer than 227 days?
How have statistics been used inappropriately and what are some examples of when you have seen or heard statistics used inappropriately?
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