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According to the hospital administrator, historical records over past 10 years have shown that 20% of major surgery patients are dissatisfied with after-surgery care in hospital. Scientific poll based on 400 hospital patients has just been performed. Determine the probability that at least 70 patients will not be satisfied with after-surgery care?
A comparison between products manufactured in China VS Mexico and their perceived quality to the US consumer based on manufacturing location.
A random sample of 50 households revealed a mean of $112,000 and a standard deviation of $40,000. What is the standard error of the mean?
Researcher is interested in testing whether there are differences in mean between population one and population two.
Body mass index is calculated by dividing a persons weight by the square of his or her height; it is a measure of the extent to which the individual is overweight.
If a randomly selected student is a female student, what is the probability she is a C student?
Compute the two groups using Paired sample t-test. Compute which modification reduced the number of traffic accidents
At the .05 significance level, is there a difference in the mean number of miles traveled per month between Cincinnati and Pittsburgh employees? Use the five-step hypothesis-testing procedure.
Length of smoking time was recorded for each. Mean was =140 hours. Suppose = 8 hours. Determine 95% confidence interval for mean amount of time grocery-store ham is smoked.
Using one proportion z test to find whether or not to support the claim - There is little evidence to reject H 0 , therefore they conclude the tvs are 20 pounds on average.
The simple random sample is n = 14, σ = 12.5 and the original population is normally distributed.
A random sample of 300 beer drinkers is selected and each member of the sample is asked to choose between two brands of beers: Brand A and Brand B. The results are that 165 prefer Brand A and 135 prefer Brand B.
Test whether the relationship between the plan at retirement and residential area using Chi square test.
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