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In a large American university in 1969, the male and female professors were sample independently, yielding the following annual salaries (in thousand of dollars):
Male
Female
12
9
11
19
8
16
10
22
Test if there was wage discrimination among gender. Assume 5% level of significance.
From this group of 2000 accounts what is the probability that an account has a balance of $500 or more, given that it is 3 or more years old?
In a water treatment plant, the turbidity level, and is suspected is linearly related to inches of accumulated rainfall in the month, x. The following information related to the waste water plant is available:
What is the probability that none are a commercial success?
In a random sample of 15 Americans 18 years old or older, find the probability that exactly 10 have read at least six books within the past year, Interpret these results.
A test statistic is a value determined from sample information used to reject or not reject the null hypothesis.All hypothesis testing is based on accepting or rejecting the alternative hypothesis.
The university police department must write, on average, five tickets per day to keep department revenues at budgeted levels. Suppose the number of tickets written per day follows Poisson distribution with a mean of 9 tickets per day.
A Manager needs to decide between two machines to put into market following a Weibull distribution. Machine X test unit cost $3000 with beta=3 and theta=500 Machine Y test unit cost $2000 with beta=3 and theta=400
describe the four possible outcomes that can result depending on the truth of the null hypothesis and the decision
Body mass index is measured as the ratio of weight in kilograms to height in meters squared. Generate a 95% confidence interval estimate of the true BMI.
A doctor believes that the variance of systolic blood pressure is 470. A random sample of 20 patients found a variance of 525. What is the smaller critical value that would be used in a hypothesis test at a .05 significance level?
The best we can do is to use one-way ANOVA and make sure to randomize the treatments to the experiment units. Why is such a randomization important?
Standard deviation of 44.7 mg/dL. Let x signify serum total cholesterol level for U.S. females 20 years old or older. Draw the distribution of the variable x.
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