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Question: a. What is the central limit theorem?
b. Does the central limit theorem specify that individual cases follow a normal distribution?
c. How do you interpret the idea that the average has a normal distribution?
d. What is the mean of a sum of independent observations of a random variable? What is its standard deviation?
e. What is the mean of an average of independent observations of a random variable? What is its standard deviation?
When 40 people used the Weight Watchers diet for one year, their weight losses had a standard deviation of 4.9 lb (based on data from "Comparision of the Atkins, Ornish, Weight Watchers, abd Zone Diets for Weight Loss and Heart Disease Reduction, ..
business firm makes and sells a steel product. product costs 5 to produce. product sells for 20. product requires 4
suppose random poll of 632 likely voters in alabama found that 373 feel that daylight savings time should be abolished.
You are in charge of a new study on the effect of caffeine and memory. From , a previous pilot study , you find that the effect size is 0.6. You want to have a type I error at 0.05 and a type II error of 0.2 . In your study you split your sample i..
Calculate descriptive statistics. Using the "split file function" compare groups by condition and gender. Run an analysis of the data sets descriptive statistics
This is a test regarding two dependent samples. There is sufficient evidence to conclude that the mean price of textbooks is lower at seller A.
Construct a time series plot. What type of pattern exists in the data? Compute the exponential smoothing forecasts for a = .2.
Speaking to a group of analysts in January 2006, a brokerage firm executive claimed that at least 70% of investors are currently confident of meeting their investment objectives.
eight different medical students took blood pressure measurements of the same patient and the results are listed below.
In the bank customer waiting time case, a bank manager had developed a new system to reduce the time customers spend waiting to be served by tellers during peak business hours.
A prospective purchaser wishes to estimate the mean dollar amount of sales per customer at a toy store located in an airport terminal. Based on data from other similar airports, the standard deviation of such sales is about $3.20.
A trucking firm suspects that the mean lifetime of a certain tire uses is less than 35,000miles. To check the claim the firm randomly selects and tests 54 of these tires and gets a mean life time of 34,570
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