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Normal distribution The manager of a night club in Boston stated that 95% of the customers are between the ages of 22 and 28 years. Assume the age of customers is normally distributed with a mean of 25 years. What is the variance of this normal distribution?
Find an example of a poll based on a self-selected sample. Report the wording of the questions and the number who chose each response. Comment on whether or not you think the results can be extended to any population.
find two dollar values such that 95% of all gas stations charge somewhere between these two values.- Can you find any other acceptable answers?
How does the self-interest principle apply to the butcher's daily tasks and productive contributions?
(Class Project) Let each student in the class respond to the question Which carbonated soft drink do you most prefer? so that the teacher can tally the results.
Determine a 95% confidence interval for the difference in the mean reductions in blood pressure, assuming that the measurements are normally distributed with equal variances.
The government of an impoverished country reports the mean age at death among those who have survived to adulthood as 66.2 years.
Two binomial population proportions are suspected to be approximately 0.3, but they are unknown precisely. Using these as initial estimates, it is desired to conduct a study to determine the difference between these two population proportions.
How large a number makes a normal distribution? Can a ledge number make a normal distribution?
Is there a significant difference between the two groups? Use the 5% significance level.
The first week he called 200 people, but only made 10 sales. Should he suspect he was misled about the true success rate? Explain.
What is the probability that between 44 and 52 (inclusive) CEOs agree that companies should make direct investments in foreign countries?
From the following information for Alfred Industries compute the overhead spending variance and the volume variance:
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