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The average price of a gallon of unleaded regular gasoline was reported to be $3.13 in Illinois. Use this price as the population mean, and assume the population standard deviation is $.20.
a. What is the probability that the mean price for a sample of 30 service stations is within $.03 of the population mean?
b. What is the probability that the mean price for a sample of 50 service stations is within $.03 of the population mean?
c. What is the probability that the mean price for a sample of 100 service stations is within $.03 of the population mean?
d. Which, if any of the sample sixes in parts (a),(b),(c) would you recommend to have at least a .95 probability that the sample mean is within $.03 of the population mean?
If zero can be the first digit and the numbers can be repeated, what is the probability Mr. Jones and Mrs. Smith select the same PIN? (Round your answer to 3 decimal places.)
Name three elements of the inferential statistical analysis.
Can the president conclude that the average family income at his school is significantly different than the population mean family income of the reported university?
This confidence interval can't be trusted to give information about the spending plans of all adults. Why not?
Using the 0.95 degree of confidence, what is the interval estimate for the population proportion (to the nearest tenth of a percent)?
How would you choose an appropriate level of significance for your statistical test? What are the possible outcomes and limitations or your statistical test?
Historically the average age of European soccer players is reported as 26 years with a standard deviation of 4 years. A random sample of 81 European professional soccer players has an average age of 27 years.
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Write the null and alternative hypotheses for testing if participants and non-participants differ in level of problem behavior (Y).
If a class of 30 students is chosen at random from the university population, find the mean and variance of the number of male students.
Quality Progress, Feburary 2005, reports on the results achieved by Bank of America in improving customer satisfaction and customer loyalty by listening to the "voice of the customer".
Let x equal the number of cells activating the alarm when the temperature reaches 100F. Find the expected value and the variance for the random variable x.
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