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Assume that IQ scores follow a normal distribution with a mean of 100 and a standard deviation of 16. Use the empirical rule to answer the following questions. What percentage of people score between 84 and 116? What percentage of people score less than 68?
A laboratory scale is known to have a standard deviation of = 0.001 gram in repeated weighings. Scale readings in repeated weighings are normally distributed, with mean equal to the true weight of the specimen.
Fix-It Copiers advertises mean time of 100 minutes for office calls with standard deviation of 25 minutes. What percentages of calls are completed?
i. how many strings of ten digits length can be formed using only the digits 12345? digits may be used more than once
Calculate the measures of center and measures of variation
1. discuss the fundamental properties of a binomial probability distribution and their application to finding
The article "Multimodal Versus Unimodal Instruction in a Complex Learning Environment" (J. of Experimental Educ., 2002: 215-239) described an experiment carried out to compare students' mastery of certain software learned in two different ways.
a survey of 100 recent fatal traffic accidents showed that 60 were alcohol-related. find the 95 confidence interval of
What is the importance of pretesting questions in an insturment you are developing? How might you go about doing such a pretest?
Use the given contingency table to (a) find the expected frequencies of each cell in the table, (b) perform a chi-square test for independence, and (c) comment on the relationship between the two variables.
fifty percent of the people that get mail-order catalogs order something. find the probability that only four of the 10
Is it sensible to conclude that this set of n=16 people is not representative random sample of registered voters?
the number of spam emails received each day follows a poisson distribution with a mean of 50. approximate the following
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