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Question: The distribution of 800 test scores in an introduction to psychology course was approximately normal, with μ = 35 and σ = 6.
a. What proportion of the students had scores between 30 and 40?
b. What is the probability that a randomly selected student would score between 30 and 40?
What is the proportion of people surveyed that rated the subway system from 3 to 4. What is the proportion of people surveyed rated the Subway System from 1 to 3.
in 2011 a sruvey by the american bar association indicated that the average yearly income of attorneys was 110000. a
If X1 and X2 are independent random variables having exponential densities with the parameters a and b the probability density of Y = X1+ X2 when a not eqal to b
the degenerative disease osteoarthritis most frequently affects weight-bearing joints such as the knee. the following
Which component of a time series is most likely to occur? Which component has a pattern that must be complete in a single year and repeat from year to year?
Modify (change) your sample size to 18600. Construct a new 95% Confidence Interval.
Create a histogram for the following data of the number of miles from residence to place of employment for 30 randomly selected residents of Middletown County.
Derive the steady-state condition in terms of the equilibrium capital stock per person, k∗, starting from the law of motion for total capital, in a Solow model with positive population growth.
A very bright student is described as having an IQ that is three standard deviations above the mean. If this student's IQ is reported as a z-score, the z-score would be the following.
On average, a pair of running shoes can last 18 months if used every day. The length of time running shoes last is exponentially distributed.
find the value of the test statistic z using the claim is that more than 75 of adults always wear a seat belt in the
a candy maker produces mints that have label weight of 20 grams on each box. assume that the weight of a box of mints
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