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A random sample is obtained from a normal population with a mean of u=95 and a standard deviation of o=40. The sample mean is M=86.
a. Is this a representative sample mean or an extreme value for a sample of n=16 scores?
b. Is this a representative sample mean or an extreme value for a sample of n=100 scores?
The following data set represents the amount spent (in dollars) by 45 shoppers at a supermarket. Construct a frequency distribution for the variable, and also report the relative frequencies for each class in your frequency distribution. NOTE: the..
We wish to decide if the wearing special glasses changes people's reading speed. Write out, in words AND in symbol form, an appropriate null and alternative hypothesis.
Most compilers can produce a source listing of the program being compiled. This listing is usually just a copy of the source file, perhaps embellished with line numbers and page breaks. Assume you are to produce a pretty printed listing.
The IQs of 17 students from one area of a city showed a mean of 106 with a standard deviation of 10, whereas the IQs of 14 students from another area showed a mean of 109 with a standard deviation of 7.
the earths temperature which affects seed germination crop survival in bad weather and many other aspects of
Studies of ‘‘intellectually gifted'' children have generally defined the lower limit of their IQ scores at 140; approximately 1% of the population have IQ scores above this limit. Find the standard deviation of this distribution.
an ecologist is studying the effects of predation on the behaviour of the common rabbit. during one hours of
in a study subjects are randomly assigned to one of three groups control experimental a or experimental b. after
Assume your statistics professor reports test grades as z-scores, and you got a score of 2.20 on the midterm exam. Write down a sentence explaining what that means.
question 1 a high school counselor wants to examine whether the teenage pregnancy rate at her school is different from
An auto manufacturer advertises that "90% of the cars we've ever made are still on the road." Assuming this is literally true, how can it be explained?
When investigating the distribution of a data set, which is more effective: a frequency distribution or a histogram? Why?
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