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The average gasoline price of one of the major oil companies has been $3.00 per gallon. Because of shortages in production of crude oil, it is believed that there has been a significant increase in the average price. In order to test this belief, we randomly selected a sample of 36 of the company's gas stations and determined that the average price for the stations in the sample was $3.20. Assuming that the standard deviation of the population is $0.22, test the hypothesis that gas prices have increased at the 5% significance level.
Annual starting salaries for college graduates with degrees in business administration are generally expected to be between $30,000 and $45,000.
A person is planning on saving money according to a rigid savings schedule. Saving plan A is to make an initial deposit of $400 and then deposit $20 per month into the account.
Which of the following would produce a new confidence interval with smaller width based on these same data and produce a new confidence interval
State the main points of the Central Limit Theorem for a mean. B. Why is population shape of concern when estimating a mean? What does sample size have to do with it?
The weight of children in the U.S. are normally distributed with a mean of 8.0 pounds and standard deviation of 1 pound
For what value of t will the null hypothesis not be rejected?
Calculate appropriate summary statistics. Incorporate these graphs and statistics into a well written summary. How could you apply statistical critical thinking in this situation?
question the table shows regulation distances between hurdles in womens and mens races. in both the womens and mens
If 55 people are chosen at random, what is the probability that the sample mean of IQ scores will not differ from the population mean by more than 2 points?
let p1 be the proportion of successes in the first population and let p2 be the proportion of successes in the second
Based on this confidence interval, can we be 95% confident that the mean yield using catalyst XA-100 exceeds 750 pounds per hour? Why?
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