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Given the following data, create a scatter diagram (using Excel), click on the points as demonstrated in the Excel workbook, and have Excel place the regression equation and coefficient of correlation on the graph for you. Interpret the results (in English).
Years of Education Annual Income (000's)
6 10
7 13
8 15
7 14
9 16
12 21
11 22
14 20
16 19
20 45
13 35
15 36
Some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and soil treatment. An experiment was conducted to compare peach tree seedling growth with soil and weeds treated with one of two her..
Find out 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
Assume you want to estimate the population proportion,p, and the estimator for the mean proportion (p-hat)= 0.34, N = 6000, and n = 1300. Find an approximate 95% confidence interval for p.
What is the rejection point at α = .10 and indicate if you would accept or reject H o ?
You take a random sample around town and calculate a p-value for your hypothesis test of 0.0913. What is the appropriate conclusion? Conclude at the 5% level of significance.
Make a List of type of possible errors. Assume that you were interested in knowing the mean score for a certain quiz in a statistics class.
A meat processing plant has processed an average of 100 tons per day for the last several years. Newer processing machines have been installed recently.
Given are the numbers of times the machine was used over each of the last 30 days. Find out the mean number of times the machine was used per day.
Assume that the mean useful life of a particular lightbulb is 2,000 hours and is normally distributed with a standard deviation of 300 hours. Determine the percentage of lightbulbs that will last 2,300 hours or longer.
Sketch the distribution of sample means for sample of n = 25 scores from this population.
Assuming the population is large, which sample size will give the smallest standard deviation to the statistic and select the numbers for the first five to be interviewed.
Suppose the least squares regression equation is Y' = 1,202 + 1,133X. When X = 3, what does Y' equal?
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