toot3715
29.11.2019 •
Mathematics
An automobile manufacturer has given its jeep a 31.2 miles/gallon (mpg) rating. an independent testing firm has been contracted to test the actual mpg for this jeep since it is believed that the jeep has an incorrect manufacturer's mpg rating. after testing 230 jeeps, they found a mean mpg of 31.4. assume the population standard deviation is known to be 2.5. a level of significance of 0.05 will be used. find the p-value of the test statistic. you may write the p-value as a range using interval notation, or as a decimal value rounded to four decimal places.
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Ответ:
The equation: n - 4 = -15
Now let's solve our equation for n.
n - 4 = -15
Add 4 to both sides.
n = -11