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A nationwide test taken by high school sophomores and juniors has three sections, each scored on a scale of 20 to 80. In a recent year, the national mean score for the writing section was 51.7 , with a standard deviation of 10.9. Based on this information, complete the following statements about the distribution of the scores on the writing section for the recent year.
(a) According to Chebyshev's theorem, at least ?56%75%84%89% of the scores lie between 24.45 and 78.95.
(b) According to Chebyshev's theorem, at least ?56%75%84%89% of the scores lie between 29.9 and 73.5.
(c) Suppose that the distribution is bell-shaped. According to the empirical rule, approximately ?68%75%95%99.7% of the scores lie between 29.9 and 73.5.
(d) Suppose that the distribution is bell-shaped. According to the empirical rule, approximately 99.7% of the scores lie between and.
If the mean μ does not differ significantly from 5.5 (that is, if the null hypothesis is true), then the probability of obtaining a sample mean y as far or farther from 5.5 than 5.4 is .1034.
table presents the thickness of a metal layer on 100 silicon wafers resulting from a chemical vapor deposition cvd
Construct a 96% confidence interval for the population proportion when 285 people out of 750 were in favour of boycotting the World Cup matches if prices were to rise above $100 for 64 televised matches.
Researchers routinely choose an -level of 0.05 for testing their hypotheses. What are some experiments for which you might want a lower -level (e.g. 0.01)?
Prepare a Histogram for Youngsters Involved in Road Accidents
Given the data set body-weight.sav, use SPSS to calculate the 90%, 95% and 99% confidence intervals for the mean of the variable weight.
The Cadet is a popular model of sport utility vehicle, known for its relatively high resale value. The bivariate data given below were taken from a sample of sixteen Cadets
a new design for the braking system on a certain type of car has been proposed. for the current system the true average
Compute the theoretical minimum number of workstations. Work Station Task Selected
assume that the time required to download a file from the itunes is exponentially distributed with mean equal to 4
Managers from accounting department and information technology department. What is the probability that the committee will contain at least two managers from accounts departments.
a single bolt is selected at random from 10000. three different kinds of defects a b and c are known to occur in these
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