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Discussion- Determining a Linear Correlation
In a test of a weight loss program, weights of 40 subjects are recorded before and after the program. Assume that the before/after weights result in r = 0.876.
Is there sufficient evidence to support a claim of a linear correlation between before/after weights?
Does the value of r indicate that the program is effective in reducing weight? Why or why not?
Suppose the bulb factory will operate only 4 hours. What is the pdf of the number of defective bulbs in 4 hours of works? Calculate the variance of the number of defective bulbs. What is the probability to have no defective bulb during 4 hours of ..
Suppose you estimate the mean length of all popular songs to be 182 seconds. Then, you use a random sample of 40 songs from your iPod to construct a confidence interval. The confidence interval you construct is (182.2, 226.2). What can you conclude a..
Read the description of the data. Then fit a suitable model to understand how the other variables affect the Survival time in days from day of diagnosis of the patients
A company makes a chemical product, and based on extensive experience they believe the critical-to-quality variable for this product has mean 410 and standard deviation 10.
Describe the differences among a systematic review, an integrative review, clinical practice guidelines and a meta-analysis.
Construct a 95 percent confidence interval for the difference between the proportions of service contracts sold on treadmills versus exercise bikes. Is there a major difference between the two pieces of equipment? Why or why not
In addition to center and spread, you can also use descriptions of shape. Shape describes the patterns you see in the data. How would you describe the shape of each dotplot
What would the probability be that a given house selected at random would have a house price above $700,000 - What would the probability be that a group of 20 houses would have an average house price less than $500,000?
A researcher would like to know whether there is a consistent, predictable relationship between verbal skills and math skills for high school students. A sample of 200 students is obtained and each student is given a standardized English test and a s..
Based on the results from the bivariate regression model, what do you conclude about the bivariate relationship between "sibs"and "childs"?
5. Sixto Sanchez is the owner of Suburban Stylists. He is evaluating the service level provided to walk-in customers. Because he is enrolled in an MBA program at Eastern University, Sixto decides to sample walk-in customers for the next two w..
1. The singular form of the word "dice" is "die". Tom was throwing a six-sided die. The first time he threw, he got a three; the second time he threw, he got a three again. What's the probability of getting a three at the third time?
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