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Worldwide it is understood that IQ scores follow a normal distribution. It is assumed that the middle 95% of the population has an IQ between 70 and 130 with a mean of 100. Use this information to determine the following:
A. What is the standard deviation of the population?
B. What IQ score corresponds to the 90th percentile?
C. What percentile corresponds to a score of 75
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suppose that in elections a candidate says that hell get 60 of the votes in the election. the total population is 300
What is the difference between the mean of the two groups? What is the difference in the standard deviation?
However, Peter's assistant Janice believes that the Liberal Party will receive approximately 75% of the vote in that riding. If survey costs are $10 per person, how much money can be saved by using Janice's estimate of the percentage rather than P..
Using the five steps of hypothesis testing and the 5% significance level (alpha), does showing the film change students' attitudes towards the chronically mentally ill?
what does it mean to say that your score on test one in statistics was in the 90th percentile?
we flip a fair coin 10 times. what is the conditional probability of getting 10 heads given that the number of heads is
If two gloves are randomly selected from the box, without replacement (the first glove is not returned to the box after it is selected), what is the probability that both gloves selected will be right-handed?
You are dealt 2 cards successively without replacement from a shuffled deck of 52 cards. Find the probability that the first card is a king and the second card is a queen.
a 7000-seat theater is interested in determining whether there is a difference in attendance between shows on tuesday
a bright idea. a company produces lightbulbs whose life follows the n1500 300 distribution i.e. the lifetimes of
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