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The following is the distribution of the readings obtained with a Geiger counter of the number of particles emitted by a radioactive substance in 100 successive 40-second intervals:
(a) Verify that the mean and the standard deviation of this distribution are = 20 and s = 5.
(b) Find the probabilities that a random variable having a normal distribution with μ = 20 and σ = 5 will take on a value less than 9.5, between 9.5 and 14.5, between 14.5 and 19.5, between 19.5 and 24.5, between 24.5 and 29.5, between 29.5 and 34.5, and greater than 34.5.
(c) Find the expected normal curve frequencies for the various classes by multiplying the probabilities obtained in part (b) by the total frequency, and then test at the 0.05 level of significance whether the data may be looked upon as a random sample from a normal population.
Using smoothing constant of w = .80, compute the value of exponentially smoothed series in 1983.
A number x is formed by choosing six digits in order, each being a 9 or a 1 and equally likely. Describe the sample space and count the number of sample points it contains.
From these statistics she calculates a 90% confidence interval of [20.9 grams, 25.1 grams]. What can the researcher do to decrease the width of the confidence interval?
in an examination of holiday spending known to be normally distributed of a sample of 16 holiday shoppers at a local
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the following data show the number of fruit fly killed at varying concentrations of nicotine.the number of ies killed
suppose the probability distribution for x 5 number of jobs held during the past year for students at a school is as
The largest salary on the list is $100,000 and is accidentally changed to $1,000,000. What is the new standard deviation?
Find the confidence interval by estimating the population proportion
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