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The national average for the price of a gallon of unleaded regular gas is $1.16. I believe the price is higher in my area of the country. I want to test my claim by randomly selecting gas prices for 25 stations in my area. The following prices are:
$1.27 $1.29 $1.16 $1.20 $1.37
1.20 1.23 1.19 1.20 1.24
1.16 1.07 1.27 1.09 1.35
1.15 1.23 1.14 1.05 1.35
1.21 1.14 1.14 1.07 1.10
The prices listed above are normally distributed. Using a one-sample t-test command and a level of significance of .05, state the five steps of the hypothesis testing procedure using:
a) non-directional hypothesis
b) directional hypothesis
What should my recommendations be based on the hypothesis and the results?
Are the decisons different in part a (non-directional) than in part b (directional)? Explain why they would differ even if they don't?
What are the tradeoffs of the two types of hypothesis?
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What is an example of a directional alternate hypothesis? What is an example of a non-directional alternate hypothesis?
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What probability distribution does n1 alone have? Specify the values of the sample size index and parameter for that distribution.
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Significant increase in the mortality of lung cancer in both genders, but no significant effect was observed at lower levels." Is this an observational study or an experiment? Fully explain your reasoning.
Here is my data: these are the wages for women with a 2 yr degree, $11,702, $24,509, $34,746, $35,185 (median of $29,627) These are the wages for women with a 4 yr.
131 are enrolled in both economics and mathematics course. Determine the probability that freshman selected at random from group is enrolled in each of the following?
A citrus company is interested in evaluating the performance of two orange juice extractors, A and B. It is believed that both the size and the variety of the fruit yield in the test may influence the yields (percentage juice by weight) obtained f..
Make use of Excel to determine the right-tail p-value.
Determine a 90% confidence interval for the mean weight of all university male first-year students.
A silver dollar is flipped twice. Calculate the probability of each of the following occurring:
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