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Assume that IQ scores are normally distributed, with a standard deviation of 11 points and a mean of 100 points. If 140 people are chosen at random, what is the probability that the sample mean of IQ scores will not differ from the population mean by more than 2 points? (Round your answer to four decimal places.)
a population has a mean of 100 and standard deviation of 20. if you select a single score from this population on the
the survival rate during a risky operation for patients with no other rate of survival is 76. what is the probability
normally distributed with a population mean of 2.5 and a population standard deviation of .5. Compute the following, showing all work: The percentage of students with GPA's above 3.0 is?
In a random sample of 500 families owning sets in the town was found that 340 subscribed to ASTRO. Find a 95% confidence interval for actual proportion of families in this town who subscribe to ASTRO.
A log-normal distribution results (which gets its name from the fact that if the logarithm is taken, the distribution becomes normal). But why is that plausible?
State the main points of the Central Limit Theorem for a mean. Why is population shape of concern when estimating a mean? What does sample size have to do with all?
A machine cuts circular filters from large rolls of material. If 7.3% of the filters fail to meet specifications, use the normal approximation to the binomial to compute the probability
Run a regression of Y on X in Excel and turn in the output with a note explaining what the coefficients {correlation coefficient (multiple R), standard error, t-statistic and F-statistic} mean.
A simple random sample of pages from Merriam-Websters Collegiate Dictionary is obtained. Listed below are the numbers of words defined on those pages
Given that SAT test scores are normally distributed with a mean of 1000 and a standard deviation of 200, what is the lowest possible score a student needs to qualify for acceptance into the university?
suppose you were given the task of estimating the proportion of drivers in troy al who text while they drive. discuss
Suppose that you perform a significance test regarding a population mean, and that the evidence does not warrant rejection of the null hypothesis.
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