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Compute mean yearly value using average gas prices by month found in "Final Project Data Set."Using years as your x-axis and annual mean as your y-axis, design scatterplot and linear regression line.
Reply the following questions using scatterplot and linear regression line:Determine slope of the linear regression line?Determine the Y-intercept of the linear regression line?Find the equation of linear regression line in slope-intercept form?Based on linear regression line, what would be the estimated cost of gas in year 2020?Write down the residuals of each year?
Choose the current price which you have seen or paid recently for gas. Is that price in range of linear regression line or is it an outlier? Is it within confidence interval of 5% or either end?
Suppose that the service rate to a waiting line system is 10 customers per hour (exponentially distributed).
A battery manufacturer advertises the average life of its automobile battery is 60 months.what % of batteries should last between 50 and 70 months? The standard deviation is 10 months.
Would it be reasonable to conclude that the population mean is 63 pounds?
The users are then timed in their ability to setup and program the DVD by performing a series of operations. Which statistical analysis technique should be used? What is the null hypothesis? Can the market researcher get an answer? Why or why not?
One characteristic of billiard balls is their elasticity - the bounce they get when striking one another. A manufacturer of billiard balls is testing three additives to the basic plastic.
Assume that we will randomly select a sample of 64 measurements from a population having a mean equal to 20 and a standard deviation equal to 4.
Compute the mean, median, mode and standard deviation for the following discrete probability distribution.
How many participants need to be enrolled in each group to achieve 80% power using a two-sided test with significance level =.05
Determine relative frequency of X=4? Generate the cumulative frequencies.
In addition, record the values for the UCL, center line, and LCL. Also, record any points that are out of control. Use a z-value of three.
Explain in words general pattern of correlation is statistically important.
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
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