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New York Yankee Roger Maris held the single-season home run record from 1961 until 1998. Here are Maris' home run counts for' his 10 years in the American League:
15 28 16 39 61 33 23 26 8 13
(a) Maris' mean number of home runs is x = 26.2. Find the standard deviation.
(b) Use your calculator to find the mean and standard deviation for the 9 observations that remain when you leave out the outlier. How does the outlier affect the values of x and s? Is s a resistant measure of spread?
x stands for mean & s stands for standard deviation.
The KW water is provided to approximately 750,000 people, who are served through more than 362,000 accounts. All accounts are metered and billed monthly.
The following is a time series data set. Run a time-series analysis for projections of April 2009 in the Healthcare industry of Nashville.
The speed limit on Interstate 75 around Findlay, Ohio, is 65 mph. On a clear day with no construction, the mean speed of automobiles was measured at 63 mph with a standard deviation of 8 mph.
Evaluate the strength of the relationship by computing the coefficient of determination.
To forecast attendance at an yearly tennis tournament a model has been developed that uses attendance from the previous year and the amount spent for advertising this year.
In an online survey of 4001 respondents, 8% were classified as productivity enhancers who are comfortable with technology and use the internet for its practical value. Suppose you select a sample of 400 students at your school, and the population ..
Someone gives you 10 to 1 odds that you cannot roll a double number with the roll of a pair of dice. You win $10 if you succeed and you lose $1 if you fail. What is the expected value of the game for you? What can be expected if you play 100 times..
To get the best deal for CD player, Jessica called eight appliance stores and asked the cast of a specific model. The prices she quoted are listed below. Show all work. Compute the standard deviation.
Discuss the properties of a normal distribution. Why are there infinite possible normal distributions? Why should one assume that sample data represents a population distribution?
Explain what the coefficient of determination, R^2 (R-squared), measures. How is it related to the sample correlation coefficient?
Suppose a simple random sample of 20 non-English student have an average math score on the SAT exam of 528. What are the appropriate hypotheses?
Briefly explain how the standard deviation influences outcome of hypothesis test. How does σ influence measures of effect size?
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