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The scores on a scholastic achievement test were normally distributed with mean 520 and standard deviation 94. (a) If your score was 700, by how many standard deviations did it exceed the average score?
If the researcher computes the t-statistic to be 4.2 and t-value found in t table for df=60 and level of significance of 0.5, is 2.0 researcher would accept or reject null hypothesis.
A large population of overdue bills has balances that follow a normal curve. When we take a sample of 100 of these the average is $500 and the standard deviation is $100. (a) what statement can you make about the range $300 to $700? (b) what state..
You have administered a standardized test of manual dexterity to two groups of 10 semi skilled workers. One of these two groups of workers will be employed by you to work in a warehouse with many fragile items.
Assume the earnings from this investment project is a normal distribution. What is the probability that you will lose money or earn nothing from this project.
According to Central Limit Theorem, how big of sample is essential to be sure sampling distribution of sample means is normally distributed.
If level of significance ( α ) is 0.005 in two-tail test, how large is non rejection region under curve of the t distribution?
The parameter of interest is the mean score in this population. The sample is an SRS of size n = 4 drawn from the population. a) Find the mean of the 10 scores in the population. This is the population mean.
Suppose your instructor randomly surveyed his or her performance (i.e., students "graded" the teacher) over many years (assume an 'infinite' population). The frequency of ratings were as follows:
What does the standard deviation mean? Interpret the standard deviation relative to the average or mean?
Why is estimating a multiple regression model just as easy as bivariate regression?
The post-anesthesia care area (recovery room) at St. Luke's Hospital in Maumee, Ohio, was recently enlarged. The hope was that with the enlargement the mean number of patients per day would be more than 25. A random sample of 15 days revealed the ..
Identify this F ratio. What does the F ratio tell you about the fit of the regression equation to the sample points? What does it suggest?
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