Teslon Metal 0.93 0:93 0.97l0,87 0,94 097 To0310.99 Ava Mean olandandd devlation= 5. For each height and both cylinders, calculate the average time and the mean standard deviation.

A random sample of 12 song lengths (in minutes) on a playlist found: = 278.3, s = 19. Build a 80% CI for the population mean length of a song on the playlist. Round all intermediate calculations to two decimals, then construct the Cl and enter like this: (min,max). Note: if you use a built-in Cl command on a calculator/computer, you might get marked wrong due to rounding. Use the formulas given in the text/notes. a. Since n < 30, We use a Z-interval O We use s, not o O It is important that song lengths be normally distributed O We use a T-interval b. The Cl is: Submit Question

Determine the standard deviation of the densities:                x1 = 2.85 g/ml,     x2 = 2.67 g/ml,      x3 = 2.63 g/ml   a. none of these b. 0 g/ml c. 0.1172 g/ml d. 0.117 g/ml e. 0.117189 g/ml f. 0.1 g/ml g. 0.12 g/ml h. 0.11 g/ml

Fluorescent lightbulbs have lifetimes that are normally distributed with a mean of 6.2 years and a standard deviation of 1 year. The figure below shows the distribution of lifetimes of fluorescent lightbulbs. Calculate the shaded area under the curve.Express your answer in the decimal form accurately to at least two decimal places. Answer:

severe storms indicate that e3.5 feet. Does this information suggest that the storm is (perhaps temporarily) increasing above the severe rating? Use off fxed cement piers. Suppose that a reading of 31 waves showed an average wave height of x= 16.7 feet. Previous studies of Weatherwise is a magazine published by the American Meteorological Society. One issue gives a rating system used to classify Nor'easter storms that frequently hit New England and can cause much damage near the ocean. A severe storm has an average peak wave height of 164 feet for waves hitting the shore. Suppose that a Nor'easter is in progress at the severe storm class rating. Peak wave heights are usually measured from land C (a) What is the level of significance? State the null and alternate hypotheses. Ho: H- 16.4 ft; H:>'16.4 ft Ho: H 16.4 ft; H1: = 16.4 ft Ho: H- 16.4 ft; H: H+ 16.4 ft (b) What sampling distribution will you use? Explain the rationale for your choice of sampling distribution. The standard…

Fluorescent lighbulbs have lifetimes that are normally distributed with a mean of 6.9 years and a standard deviation of 1 years. The figure below shows the distribution of lifetimes of fluorescent lightbulbs. Calculate the shaded area under the curve. Express your answer in decimal form accurate to at least two decimal places. Answer: 4.9 6.23 Lifetines of Fluorescent Lightbulbs

A soft drink machine at a local fast food restaurant can be calibrated so that it dispenses an average of μ ounces per cup. If the ounces of soda dispensed are normally distributed with standard deviation 0.6 ounces, find a value of μ such that 36-ounce cups will overflow only 10% of the time. Round the solution to one decimal place, if necessary. μl = ounces

The amount of trash generated by US households (in lbs per day) is Normally distributed. You a random sample of 8 people gives you an average of 10.00 lbs and a sample stdev of 5 lbs. What is the 90% Conf. Int. for the mean?

Suppose the lengths of human pregnancies are normally distributed with u = 266 days and 0 = 16 days. The figure to the right represents the normal curve with u = 266 days and 0 = 16 days. The area to the left of X = 245 is 0.0947. Provide two interpretations of this area.

A student made three measurements of the mass of an object using a balance (± 0.01 g) and obtained the following values: Measure # 1 4.39 ± 0.01 g Measure # 2 4.42 ± 0.01 g Measure # 3 4.41 ± 0.01 g   Find the mean value and its standard deviation and express the result to the correct significant figures.   Choose one   A) (4.41 ± 0.02) g B) (4.40 ± 0.01) g C) (4.40 ± 0.02) g D) (4.406 ± 0.0152) g