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An experiment looked at amount of weight lost in a year by subjects assigned to the Atkins diet. Tell whether each of the following focuses on data production, displaying and summarizing, probability, or statistical inference:
a. Researchers randomly assigned some patients to follow the Atkins diet.
b. Mean weight loss at one year was 2.1 kg.
c. If the subjects were a random sample taken from a population whose mean weight loss equaled zero, the probability of a sample mean weight loss as high as 2.1 kg is found to be 0.009.
d. Because the sample mean weight loss is significantly higher than zero, researchers concluded that the Atkins diet is effective.
Formulate the hypothesis that can be used to determine whether the sample data support the hypothesis that the mean fuel efficiency rating for midsize cars is greater than the mean fuel efficiency for large cars.
Petroleum is cracked to make gasoline and other products such as lubricating oil and kerosene.The process is too slow to allow sample sizes greater than one. The following are the octane rating of the output from the process recorded at intervals..
Some insurance companies are not humanitarian organizations. Therefore, some humanitarian organizations are not insurance companies.
The following data was randomly drawn from a normal population. At an alpha level of .05, does the mean of the population differ significantly from -150. Use Excel.
What probabilities are given in this case? Use these probabilities and the probability laws to determine what percentage of U.S. households purchased Total.
Use the calculator to generate a linear regression equation for this graph & a correlation coefficient r. What does the linear regression equation tell you?
Based on observations of a few third graders in the lunch line, they assess P(P) as 0.75. More convincing evidence that P(P) is .75 would be?
What is pn, the sample proportion of successes?What is p0, the hypothetical proportion of success under the null hypothesis?
suppose you toss a fair coin 12 times. what is the probability of getting exactly 10
What is the explanatory variable in this study?- What is the response variable in this study?- Give an example of a third variable that might at least partially account for the observed relationship.
Scores on a state assessment test were averaged for all the schools in a particular district, which were classified according to level.
A specialty machine shop is improving the efficiency of its surface-grinding process [21]. The existing machine is mechanically sound, but manually operated.
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