Iq scores for adults follow a bell-shaped
On the particular test, IQ scores for adults follow a bell-shaped (symmetric) distribution with mean=100 and a variance of 100. In a random sample of 1250 adults, approximately how many would have IQs between 90 and 120?
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1. An LU professor is interested in the whether there is the difference between undergraduate students and graduate students in the amount of time spent praying each and every day. The professor gathers information from random samples of undergrad
A teacher wants to investigate whether there is a difference between male and female students in the amount of time they spend studying for statistics. The table below shows the amount of time students spend studying statistics each week. The amou
The table below shows the scores on the quiz. The study is completely counter balanced to control for order effects. The scores obtained are measured on an interval-ratio scale and are normally distributed.
A card is chosen from the ordinary deck of 52 cards. Find the probabilities for each of the following:
For a given wind turbine, the probabilities of the failure to component A, B, and C follow the rule 3:2:5. The respective probabilities of detecting individual failure in the component are .8, .9 and .9. A failure happens. Determine the probabilit
A normal population has the known mean 50 and unknown variance. A random sample of n =16 is selected from this population, and sample results are = 52 and s=8. How strange are these results? Discuss.
Which of the following would be the most excellent measure of performance for the profit center?
We have seen that if Y has the binomial distribution with parameters n and p, then Y/n is an unbiased estimator of p. Te estimate the variance of Y, we generally use n(Y/n)(1-Y/n).
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