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Two sets of elementary school children were taught to read by different methods, 50 by each method. At the conclusion of the instructional period, a reading test gave results y1 = 74, y2 = 71, s1 = 9, and s2 = 10. What is the attained signi?cance level if you wish to see if there is evidence of a real difference between the two population means? What would you conclude if you desired an α-value of 0.05?
suppose we roll a die 10 times. what is the approximate probability that the sum of the numbers obtained lies between
A random sample of 4000 U.S. citizens yielded 2190 who are in favor of gun control legislation. Find the point estimate for estimating the proportion of all Americans who are in favor of gun control legislation.
The random variable x, which is the number of occurrences of an event over an interval of ten minutes. It can be assumed that the probability of an occurrence is the same in any two time periods of an equal length.
q1. describing data frequency distribution and graphic presentationsyou are the parts manager for a local dumb phone
Assume the distribution of ages of homes follow an approximately normal distribution. Show all the seven steps and include the p-value.
Estimated the probability that among 75 randomly selected students, at least 20 of them score greater than 78.
the following data give the 1994 total area of farmland in millions of acres for 10 states statistical abstract of the
Assuming the sensitivity and specificity of the screening test are the same, which of the following statements about positive predictive value (PPV) applies.
Identify a cam shaft, red, green and yellow (or any combination of these three colors) could not be used to identify another part. How many parts can the paint department code?
In the order of operations Pemdas requires that exponentation takes precedence over multiplication, so we cannot multiply 4*2 without first evaluating 2^x, but we could divide both sides by 4.
a newspaper article reported that a poll based on a sample of 1150 residents of a state showed that the states
the life time t of a durable substance is an exponential distributed ramdom varialble with average 1.5 year
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