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The owner of a gasoline service station wants to study gasoline-purchasing habits by motorists at his station. A random sample of 60 motorists during a certain week is selected with following results. Amount purchased = 11.3 liters, S = 3.1 liters 11 motorists purchased super unleaded gasoline
(1) At the 0.05 level of significance, is there evidence that the average purchase is different from 10 liters?(2)At the 0.05 level of significance, is there evidence that less than 20% of the motorists purchase super unleaded gasoline?
A random sample has been taken from a normal distribution and the following confidence intervals constructed using the same data: (38.02, 61.98) and (39.95, 60.05). What is the value of the sample mean?
Determine the point estimate and 95% confidence interval for the mean family dental expenses of all employees of the company.
Would it be appropriate to say the coefficient of determination (R-squared) is the proportion of variation in Y due to the variation within each of the categories of X?
Compute β-error of test in part (a) if true difference in mean burning rate is 2.5 centimeters per second.
The main purpose of this exercise is to check your understanding of significance level, p-values and power .
A researcher has reason to believe that, for an experiment with 50 points, a 95% prediction interval would be of width 4. If the researcher wishes to run a more precise experiment that will result in a 95% prediction interval of width 2, then the ..
From past experience, a server at a restaurant knows that her tips follow a right-skewed distribution with mean $6 and standard deviation $4.
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
What is the probability of selecting a store at random and finding it has both a pharmacy and a floral shop?
For the following statement, write the null hypothesis and the alternative hypothesis. Then, label the one that is the claim being made.
A digital camcorder repair service has set a goal not to exceed an average of 5 working days from the time the unit is brought in to the time repairs are completed. A random sample of 12 repair records showed the following repair (in days)
Her mean waiting time was 7.4 minutes. Assume that the standard deviation has been historically known to be 2.2 minutes. At the .05 significance level, test the claim that the mean waiting time is less than 10 minutes.
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