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Suppose a study reports that the average price for a gallon of self-serve regular unleaded gasoline is$3.16. You believe that the figure is higher in your area of the country. You decide to test this claim for your part of the United States by randomly calling gasoline stations. Your random survey of 25 stations produces the following prices (all in $). Assume gasoline prices for a region are normally distributed. Do the data you obtained provide enough evidence to reject the claim? Use a 1% level of significance.
3.27 3.29 3.16 3.20 3.373.20 3.23 3.19 3.20 3.243.16 3.07 3.27 3.09 3.353.15 3.23 3.14 3.05 3.353.21 3.14 3.14 3.07 3.10
Construct a 95 percent confidence interval for the population mean. Is it reasonable that the population mean is 28 weeks? Justify your answer.
Probability using discrete distribution.The probability distribution for the random variable x follows.
Assume that the annual rate of return for a common biotechnology stock is normally distributed with a mean of 5.5% and a standard deviation of 6%.
The sample information is reported below. At the .10 significance level can we conclude that there is a difference in the amounts quoted?
The singer has the following variety of songs, in no particular order: 7 relationship songs, 6 songs about people, 4 reflective songs, and 4 songs about places.
Name three elements of the inferential statistical analysis.
Compute fraction of the employees cost between $1,500 and $2,000 per year? Evaluate percent that didn't have any dental expense.
For the 20 test scores shown, find the percentile rank for a score of 86.
When the level of confidence and sample size remain the same, a confidence interval for a population proportion π will be __________ when p(1-p) is larger than when p(1-p) is smaller.
Confidence interval for the true mean and Evaluate the 95% confidence interval for the true mean advertising expense?
Find a 95% confidence interval for the percentage of girls and women in Taiwan who had antibodies at that time.
a random sample of 100 doctors was selected. Suppose you reject the null hypothesis. What conclusion can you draw?
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