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What is the proportion of the total area under the normal curve within plus and minus two standard deviations of the mean?
A) 68%
B) 99.7%
C) 34%
D) 95%
The probability that a patient recovers from a disease is 63%. What is the probability that:
A company is filling bags of rock salt to a level of 50 pounds. It believes that all bags are filled correctly, but would like to use a hypothesis test with an alpha of 0.05 to check this belief.
These 64 students will spend a combined total of more tahn $715.21? What is the probability that these 64 students will spend a combined total between $703.59 and $728.45?
The sample mean, the sample proportion and the sample standard deviation are all unbiased estimators of the corresponding population parameters. True or false (please provide a solution or explanation).
The the steps of hypothesis testing b) sketch the distribution involved, and c) explain your answer to someone who is familiar with the t test for a single sample but not with the t sest for independent means.
A sample of 120 homes sold recently in a big city gave the mean price of homes equal to $270,000 and the standard deviation equal to $70,000. (a) What is the point estimate of the mean price of all homes in the big city?
Find the relative risk for moderate beer drinkers as compared to nondrinkers, finds the 95% confidence interval
What is the alternative hypothesis for a null hypothesis stating that the average time a person keeps a cell phone is, at most, three years?
Calculate the mean, median of the following grade point averages
A big multinational corporation based in Toronto recently moved it's production facilities to Mexico. When the corporation was in Toronto, it had an older, experienced labour force with a mean age of 45 years.
Two groups of students are asked to rank their preference for six types of soft drinks. The following table shows their rankings.
Write a brief statement of purpose of the study. Define the population. State the hypotheses for the study. Select an a value
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