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1. What percentage of people falls between -2 and +2 standard deviations on IQ scores ( if the general population of IQ scores assumes a normal distribution )?
2. The following is a sample of responses to a survey asking teens how many cigarette they had smoked in the last 30 days. Please calculated S2 ( variance ) and S ( standard deviation ) and report the middle 68% and the 95% of the cigarette smoking behavior. 1, 0, 0 , 2, 0, 3, 0, 2, 0, 4, 0, 1, 1, 1, 5, 5, 5, 20, 20
ajax manufacturing is an electronic test equipment manufacturing firm that markets a certain piece of specialty test
Consider the many possible distributions of grades on a quiz in a statistics class; imagine that the grades could range from 0 to 100.
Discuss the characteristics of a good research hypothesis. What distinguishes a null hypothesis from a research hypothesis? How would you explain the difference between non-directional research and directional research hypothesis?
A 10 year study by the American Heart Association provided data on how age, blood pressure and smoking relate to the risk of strokes.
What is the 95% confidence interval for the true average number of hands per hour during peak hours?
Descriptive statistic results from quarterly sales figures over a 18 year period (73 qtr) are below. Please interpret the standard Deviation and Median in terms of sales results,
Tim has two more problems to solve on his test, but he doesn't know how long it will take to finish them. He assigns mutually irrelevant normal distributions to the times
q1. listed below is the net sales in million for home depot inc. and its subsidiaries from 1993 to 2004.yearnet
probability values based on normal distribution.the old exit exam followed a normal distribution with micro 500 and
Explain why the polls that are so frequently quoted during early returns on Election Day TV coverage are an example of cluster sampling.
Test this conjecture with formal hypothesis test, by using a 5% significance level. Find out the p-value for hypothesis test.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
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