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Below is the data from an agricultural experiment. The purpose of the study was to see how the yield of corn changes as we change the planting rate (plants per acre).
Plants per acre Yield (bushels per acre)12,000 150.1 113.0 118.4 142.616,000 166.9 120.7 135.2 149.820,000 165.3 130.1 139.6 149.924,000 134.7 138.4 156.128,000 119.0 150.5
Make a scatterplot of the data to help you answer the next questions. (Use a scale of yields from 100 to 200 bushels per acre. You will need to repeat each planting rate to match the number of yields shown.)Data set
Find the least-squares regression line for predicting yield from planting rate and add this line to your plot. Choose the correct equation for the least-sqruares regression line.
The dean of students believes that teh costs are greater this semester. What is the test value for this hypothesis?
Consider Obama's health care plan. There are = #s of males and females. 50% of the females approve (A) of the plan and 70% of the males do not approve (N) of the plan.
An independent-measures t test produced a t statistic with df=20. If the same data had been evaluated with an analysis of variance, what would be the df values for the F-ratio?
There were 3 defectives in the first batch and 5 in the second. Find a 95% confidence interval for the difference in the proportion of defectives.
Elephant came up twice as often as any other animal but that all the other animals came up equally often. Assuming there results were true, the probability of tossingan elephant is?
In each of the following scenarios, which would be larger, the mean or median, or would the mean and median be about the same? Provide reasoning--think about the shape of the histogram for the data and how the shape would affect the relationship b..
A random sample of 70 printers discovered that 20 of them were being used in small businesses. Find the 99% limit for the population proportion of printers that are used in small businesses.
Is there evidence that the population mean is above $300, if X (bar) = $305.11 and s = $43.20?
With this information, by constructing a 2 by 2 table, compute the predicative value positive and predictive value negative of the ELA in hypothetical population of 1000000 blood donors.
What is a discrete random variable and how does it differ from a continuous random variable? Give examples.
Test the given claim using the traditional method of hypothesis testing.
A medical researcher suspects that the pulse rate of smokers is higher than the pulse of non smokers. Use the sample statistics below to test the researchers suspicion.
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