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In a nationwide study directed by UMUC Teaching Hospital, 780 persons with stable heart disease were treated. Half of the subjects were treated with drugs and half underwent bypass surgery. After 6 years,351 of those treated with drugs and 359 of those who underwent bypass surgery were still alive.
At the 0.05 significance level, is there sufficient evidence to support the claim that surgery is more effective than drugs? show all work and justify your work.
The UMUC Daily News report that the color distribution for plain M&M's was: 40% brown, 20% yellow, 20% orange, 10 green, and 10% tan. Each piece of candy in a random sample of 100 plain M & M's was classified according to color, and the results are listed below:
In this case use a 0.05 significance level to test the claim that the published color distribution is correct. (show all work and justify your answer).
The weight of a small Starbucks coffee is a normally distributed random variable with a mean of 370 grams and a standard deviation of 15 grams. Find the weight that corresponds to each event:
When modelling E(y) with single qualitative independent variable, number of 0 - 1 dummy variables in model is equal to number of levels of qualitative variable.
a) Find the 95% confidence interval for the population mean based on the 37 patients who remain after you drop the outlier. b) Compare your interval in (a) with your interval from Exercise 18.32. What is the most important effect of removing the ou..
Armstrong Faber produces a standard number-two pencil called Ultra-Lite. Since Chuck Armstong started Armstrong Faber, sales have grown steadily. With the increase in the price of wood products.
Use Random Number Generation (RNG) in Analysis ToolPak of Excel to generate n = 5 observations from the Normal distribution N(20, 5). Construct the 95% confidence interval for μ.
Estimating the sample standard deviation using normal score - Find the sample standard deviation?
You perform a one sample mean hypothesis test on a random sample of data and observe a p-value of 0.2157. What is the appropriate conclusion? Conclude at the 5% level of significance.
To conclude the effect of a new fertilizer on productivity of tomato plants one group of plants is treated with the new fertilizer as a second group is grown without such treatment. The number of ripe tomatoes produced by each group is counted.
Read the data from the fictitious research study regarding diabetes and alcohol consumption, and analyze and interpret the results.
At a large commercial bakery, one of the measures familiar with evaluate employees is the number of broken cookies per 1000 produced. The quality control department wants to determine if there is a relationship between years of experience and bro..
Given the same significance level, a ________ value of t will be required to reject the null hypothesis compared to the value of z required for rejection.
Consider following data on exam scores of 10 randomly selected students: Compute 3rd quartile of the exam scores.
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