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Foot size correlates positively with math skills. This is because younger children have tiny feet and do not know math. Correlation does not mean causation. Sometimes we make that error. What things may correlate, but not be causal?
Create a histograms for variable height-pull up Graph
Recorded the time in seconds it took for 8 participants to solve a puzzle. These times appear below. However, when the data was entered into the statistical program, the score that was supposed to be 22.1 was entered as 21.2.
Foreign trade is important to the United States. No country exports and imports more. However, there has been a large trade imbalance in many sectors. To measure the extent of the prob- lem, an economist recorded the difference between exports and im..
Why do we care whether the assumptions required for statistical tests are met?
In a simple random sample of 36 families in a certain country, you find that sample mean income to be $9,500 with a sample standard deviation of $2,500. Run a hypothesis test (α=.05) to test whether the population's mean exceeds $9,000. What is the..
SPC is one of a number of tools which can be used to improve manufacturing quality standards - Outline two techniques which can be used to decide where to put SPC effort most effectively.
A random sample is drawn from a population of known standard deviation
Obtain the arithmetic mean
Evaluate the value of beta for each stock. Which of these stocks would you expect to perform best in an up market? Which would you expect to hold their value best in a down market?
A second researcher doubts these findings, believing that the actual figure is higher. To attempt to resolve the question, a simple random sample of 60 preschool children is chosen, and their TV watching habits are measured by having their parents ke..
Uncle Henry has been having trouble keeping his weight constant. In fact, at the end of each week, he notices that his weight has changed by a random amount, uniformly distributed between ?0.5 and 0.5 pounds.
A business man must travel to five different destinations
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