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a) In a pavement study the diameter of the aggregate stones is found to be normally distributed with a mean of 4 cm and a standard deviation of 0.5 cm. Say this distribution is denoted by R.V. X, show the equation convert X to a standard normal distribution.
b) For a standard normal distribution, separately find z such that
i) the area to the right of z is 0.1949
ii) the area to the left of z is 0.0655
iii) the area between -0.13 and z is 0.3311
Suppose we are testing if the true mean amount of gas sold on a day is less than 900 gallons, at a 5% level of significance, the value of z* would be?
Use a 0.05 significance level to test the claim that this sample comes from a population with a married percentage of less than 58.6%.
based on the information compute the confidence interval using the t-distribution1. a tire manufacturer wishes to
a student takes a calculus midterm and a history midterm. the mean and standard deviation on the calculus midterm are
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1 the average score for male golfers is 95 and the average score for female golfers is 106 golf digest april 2006.
Seven employees were included from Area A, 9 from Area B and 12 from Area C. The test statistic was computed to be 4.91. What can we conclude at the 0.05 level?
A real estate agent has 2 tours. The first tour through N1and has 10 homes for sale, whereas the second tour through N2and has 5 homes for sale.
When such digits are randomly generated, what is the distribution of those digits? Given such randomly generated digits, what is a test for "goodness-of-fit"?
twenty percent of all telephones of a certain type are submitted for service while under warranty. of these 60 can be
dotcom receives component parts from supplier x continuously throughout the year. the company randomly samples 25
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