The EPA reports that the exhaust emissions for a certain car model has a mean of 1.45 grams of nitrous oxide per mile. The car manufacturer claims their newest model of that car emits less than 1.45 grams of nitrous oxide per mile. A simple random sample of 34 cars is taken and the mean level of exhaust emitted for this sample is 1.21 grams with a standard deviation of 0.52 grams. Perform steps 2 and 3 of the hypothesis test with a level of significance of 0.05. Step 2 (as a decimal): ? = Step 3 -- use Minitab Note: to change the decimal places in Minitab, right click the value you want to change. test statistic (round to two decimal places): p-value (round to four decimal places):
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The null hypothesis (H0) is that the mean exhaust emission for the newest model is equal to 1.45 grams of nitrous oxide per mile. The alternative hypothesis (H1) is that the mean exhaust emission for the newest model is less than 1.45 grams of nitrous oxide per Show more…
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The level of nitrogen oxides (NOX) and nonmethane organic gas (NMOG) in the exhaust over the useful life (150,000 miles of driving) of cars of a particular model varies Normally with mean 80 mg/mi and standard deviation 6 mg/mi. A company has 16 cars of this model in its fleet. Using Table A, find the level L such that the probability that the average NOX + NMOG level x̄ for the fleet greater than L is only 0.03? (Enter your answer rounded to three decimal places. If you are using CrunchIt, adjust the default precision under Preferences as necessary. See the instructional video on how to adjust precision settings.) L = 111.020 Feedback This requires a backward (inverse) Normal calculation. Remember to use the standard deviation of x̄ and not the standard deviation of the population. Did you divide the given standard deviation by √n? Did you put the desired probability on the right side of L?
Ana Carolina D.
The level of nitrogen oxides (NOX) in the exhaust of a particular car model varies with a mean of 0.7 grams per mile and a standard deviation of 0.16 grams per mile. (a) What sample size is needed so that the standard deviation of the sampling distribution is 0.01 grams per mile? (b) If a larger sample is considered, the standard deviation for car x would be. (NOTE: Enter "SMALLER", "LARGER", or "THE SAME" without the quotes.)
Adi S.
The Environmental Protection agency requires that the exhaust of each model of motor vehicle be tested for the level of several pollutants. The level of oxides of nitrogen (NOX) in the exhaust of one light truck model was found to vary among individually trucks according to a Normal distribution with mean 1.45 grams per mile driven and standard deviation 0.40 grams per mile. (a) What is the 35th percentile for NOX exhaust, rounded to four decimal places? (b) Find the interquartile range for the distribution of NOX levels in the exhaust of trucks rounded to four decimal places.
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