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Computing probability values using normal distribution.
A sample of 500 evening students revealed that their annual incomes from employment in industry during the day were normally distributed with a mean income of $30,000 and a standard deviation of $3,000.How many students earned between $20,000 and $40,000?
The simple coefficient of determination is the proportion of total variation explained by the regression line.
The issue of how much should be spent to solve particular U.S. social problems is a complex matter, and people have diverse and conflicting ideas on these issues.
The number of degrees of freedom corresponding to between treatments is:
what is the sample space of all possible outcomes? Are the outcomes equally likely?
The student with the 92 found a grading error on her exam and her correct grade was 95. There were no other grading errors. After correcting this student's paper, the five number summary for the midterm exam will be
Find the Probability and prove that the given two events are mutually exclusive and independent or not.
What is the P-value of the test, assume the standard deviation is 3 years, a 95% confidence interval for the average time
At the .01 significance level, is there a difference in the use of the four entrances?
Following sample data shows the weekly closing price of ABC stock. Compute the sample mean and variance from this data set.
Find the area under the normal distribution curve between z = 1.52 and z = 2.43.
The lengths of pins produced by a machine follow a normal distribution with mean 2.54 cm and standard derivation 0.04 cm.
Provide a brief description of the main features of these data from the scatter plot and Describe why you would use performance as the predictor variable and performane related pay as the dependent variable in such a model.
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