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The mean sat verbal score is 401, with a standard deviation of 97. Use the empirical rule to determine what percent of the scores lie between 207 and 498. (assume the data set has a bell-shaped distribution).
Four different paints are advertised as having the same drying time. To check the manufacturer's claims, five samples were tested for each of the paints.
A sample of 4 trucks is randomly selected. What is the probability that 2 of those tested have defective brakes.
The following data set shows the ages of the first 7 presidents and the 7 most recent presidents including President Obama. Find the mean, median, and range for each of the two data sets.
To obtain the probability that the mean wage of 75 randomly selected workers will exceed $43,000
Build a scatter plot, Find the value of the linear correlation coefficient r, and find the critical value of r using α=0.05. Determine whether there is sufficient evidence to support a claim of a linear correlation between the two variables.
A IRS auditor randomly selects 3 tax returns from 57 returns of which 6 contains errors. What is the probability that she selects none of those containing errors?
Draw a ball from number 1: if red go to number 2; if black go to number 3. What is probability
There is a statistical deception here. Explain what is deceptive about the bar graph.
Test whether there is a statistical difference between the two proportions at the 5% significance level.
A manager of a large department store with three floors reports that the time a customer on the second floor must wait for an elevator has a uniform distribution ranging from 0 to 16 minutes. It takes the elevator 1 minute to go from floor to floo..
M&M Confidence Interval regarding the count of each color of M&M contained in a "fun size" bag of M&Ms for hypothesis testing. Use the traditional hypothesis testing method,
We wish to determine whether the homicide rate is different in different parts of the country and, if it is different, what is the pattern. We have data on 36 states - 9 each in the four regions Northeast, Midwest, South and West.
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