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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
Determine the chance between 39% and 41% of registered voters in sample are Democrats.
Determine the estimated mean of the following frequency distribution. A sample of the amounts paid for parking on Saturday at the Downtown Parking Garage in Toronto was organized into the following frequency distribution.
A probability value of .25 means that an event will occur:
At the .05 significance level, can we conclude that the guideline is still reasonable?
Hours worked is important predictor of amount of sales.
The dealership would now like some general information based on the entire sample of vehicles. Calculate and explain the following:
A normal population has a mean of 60 and a standard deviation of 3. You select a sample of 36. Compute the probability the sample mean is (Round z values to 2 decimal places and final answers to 4 decimal places):
Test the mean cholesterol content in the egg is greater than 2.5 percent
If the sample consists of n = 15 individuals, then compute df value for the t statistic?
Suppose that a random sample of 800 early replacement buyers yields a mean number of dealers visited of 1 = 3.3, and that a random sample of 500 late replacement buyers yields a mean number of dealers visited of 2= 4.5.
Discuss possible study designs. Which of the designs would we use to test our research hypothesis?
Suppose that you select a 50 families sample. Which is the form expected from the distribution of the average or median of the sample?
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