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Data from sample of 25 gas stations has a sample mean of $0.06 for a gallon of regular gas. The sample standard deviation is 8.56. Alarmed at the rising gas prices in your town, you decide to estimate the average gas price for a gallon of regular gas.
a) Calculate a 90% confidence interval for the average price of a gallon of regular gas.
a) State whether descriptive or inferential statistics has been used. Explain your answer.
If these values are removed, do you think the mean will increase, decrease, or remain the same? What about the standard deviation? Explain.
A jewelry store orders five sets of earrings from this supplier. If the supplier selects the pairs of earrings at random, what is the chance that the jewelry store gets exactly two sets of platinum pairs?
Calculate x2, s2 and s for the expense data. Show that the two different formulas for calculating s2 give the same result.
For each of the following categorical propositions identify the letter name, quantity, and quality. Then state whether the subject and predicate terms.
Small Wonder, an amusement park, experiences seasoned attendance. It has collected two years of quarterly attendance data and made a forecast of annual attendance for the upcoming year.
Assuming that the average annual expenditure of all consumer units was $30,692 in 1994, test at the 5% signi?cance level whether the annual expenditure per consumer unit had really increased from 1994 to 1995.
for a binomial probability function with p 0.4 and n 20 find the probability that the number of successes is equal to
Suppose that in NY State, 35% of voters are Democrats, 30% are Republicans, and 11% are independent. You are conducting a poll by randomly calling registered voters. In your first four calls, what is the probability that you talk to:
Find the probability that a standard normal random variable will be between -0.01 and 0.05.
Is there any evidence to suggest that the population proportion of residents in Ohio who recycle newspapers is greater than the population proportion.
What's the mean of this difference? What's the standard deviation of this difference?
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