Oven thermostats were tested by setting them to350°F and measuring the actual temperature of the oven. In a sample of 67 thermostats, the average temperature was 348.2°F and the standard deviation was 5.1°F.
a. Find a 90% confidence interval for the mean oven temperature.
b. Find a 95% confidence interval for the mean oven temperature.
c. What is the confidence level of the interval(347.5, 348.9)?
d. How many thermostats must be sampled so that a 90% confidence interval specifies the mean to within ±0.8°F?
e. How many thermostats must be sampled so that a 95% confidence interval specifies the mean to within ±0.8°F?
You might also like to view...
____ drawings are substantially different from architectural drawings in style and content, including manufacturing conventions and special fabrication instructions.
A. Data B. Mock-up C. Shop D. Construction
Horses use their ____ for chewing before swallowing, whereas cattle ingest large quantities of food with minimal chewing.
A. incisors B. molars C. canine teeth D. wolf teeth
Shaft A has a diameter of 76 mm and shaft B has a diameter of 49 mm. What is the difference in diameter between the two shafts?
Fill in the blank(s) with the appropriate word(s).
Slightly contoured objects can be shown in multiview as having rounded features by ____ to accent the rounded features.
A. using phantom lines B. shading C. using light continuous lines D. both a and b E. none of the above