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a) Calculate a confidence intervals for p1 at 1% significance level. Mu= 395,625, SD=78,550. Are the confidence intervals overlapping ? Check all the necessary assumptions that are required to perform these calculations.
b) Calculate a confidence intervals for p2 at 1% significance level. Mu= 394,893, SD=73,377. Are the confidence intervals overlapping ? Check all the necessary assumptions that are required to perform these calculations.
c) Construct now the 95% confidence interval for the difference p1-p2. Could you conclude that p1 and p2 are different ? Explain your answer.
A random sample of 72 graduate students generated the following 90% confidence interval: (0.438, 0.642). Based on the interval above, is the population proportion of females equal to 0.60?
Total housing costs as a percent of monthly income, five years ago and now. The information is reported below. Is it reasonable to conclude the percent is less now than five years ago?
The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. What is the probability that a student uses fewer than 600 minutes?
Does the data prove a significant difference in mean times?
To test whether there is significant mean difference between two groups using independent sample t test.
Sampling Distribution for mean
In a sample of 1,000 representing a survey from the entire population, 650 people were from Laketown, and the rest of the people were from River City.
A random sample of 49 employees took a computer literacy test. The sample resulted in a mean score of 75 with a standard deviation of 21. Develop an approximate 95% confidence interval for the population mean of the 600 employees.
in a randomized comparative experiment on the effect of color on the performance of a cognitive task researchers
U.S. News & World Report publishes the average starting salary and the average GMAT score for MBA graduates at each of the top 80 ranked schools in the country.
A health and safety committee is to be selected from all the people who work at a local factory. The committee is to consist of four members selected randomly from a list of ten names.
Share your determination of probability in each of the situations. Explain how these two ways of assessing probability are different and how they can help make decisions.
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