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Question: 1. The average score on the Stats midterm was 75 points with a standard deviation of 5 points, and Gregor's z-score was How many points did he score?
2. Mensa. People with z-scores greater than 2.5 on an IQ test are sometimes classified as geniuses. If IQ test scores have a mean of 100 and a standard deviation of 16 points, what IQ score do you need to be considered a genius?
What are the mean value and standard deviation of the number of students who want new books? What is the probability that the number of students who want new books is more than two standard deviations above the mean?
Normally distributed with a mean of 52 and a standard deviation of 3. What is the probability that the MPG for a selected mid-size car would be greater than or equal to 50.
Never forget that even small effects can be statistically significant if the samples are large. Of 148 small businesses, 106 were headed by men and 42 were headed by women.
a national survey of 40000 adults in the us in 1992 found that 26 of adults were current smokers. a similar survey of
Digital camcorder repair service has set the goal not to exceed average of 5 working days from time unit is brought in to time repairs are completed. Compute the t-value.
mollys candle shop has several retail stores in the coastal areas of north and south carolina. many of mollys customers
Let Un and Vn converge in probability to c and d, respectively. Prove the following. (a) The sum Un + Vn converges in probability to c + d.
What sample size is required to estimate the proportion of people with blood type O in a population of 1500 people to be within 0.02 of the true proportion with 95% confidence? Assume no prior knowledge about the proportion.
consider the experiment of drawing two cards from a shuffled deck and then putting them back. what is the probability
a car agency sells 50 of its inventory of a certain foreign car equipped with side airbags. find a formula for the
in one particular race there are 7 people 3 of which are runners of the track coach. the race is so competitive that
A researcher conducts a study of perceptual illusions under two different lighting conditions. Twenty participants were each tested under both of the two different conditions.
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