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High School GPA is normally distributed with a mean of 3.06 and a standard deviation of 0.40. The probability of a randomly chosen student having a HS GPA between 3.54 and 3.80 is:
a) 0.4678
b) 0.0829
c) 0.8527
d) 0.3849
The average time a subscriber spends reading the Wall Street Journal is 49 minutes. Assume that the standard deviation is 16 minutes and the time are normally distributed .
If the rods' lengths produced by your line are normally distributed, with a mean equal to the target of 0.2 meters, and a standard deviation of 0.015m, what percentage of rods will be scrapped?
Find a 99% confidence interval for the population mean number of weekly miles.
Develop a p chart with 3-sigma control limits and evaluate whether the process is in statistical control
A bag of jelly belly candies contains the following colored jelly beans: red (10), blue (2), orange (5), brown (21), green (0), and yellow (18). Construct the probability distribution for x.
To test the difference between two means using two mean z test.
Determine the most economical monthly shipping schedule. Provide a table showing the routes and total costs.
Test the hypothesis that the annual incomes of corporate trainers in areas of more than 500,000 are significantly more than those in areas of less than 100,000.
When the non-parametric statistics utilized? Write down an example.
She knows that 60% of the minerals have mass less than a certain amount m, and needs to select a random sample of n = 16 specimens for an experiment. With what probability will their average mass be less than the same amount m? (Hint: Calculate th..
Is there any statistically significant difference in how the drugs perform? If so, explain the effect. Use the post hoc tests as needed.
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
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