Question
In: Statistics and Probability
A machine produces 3-inch nails. A sample of 10 nails is obtained and the lengths determined....
A machine produces 3-inch nails. A sample of 10 nails is obtained and the lengths determined. After some calculation, the sample mean is 2.99 and the sample standard deviation is 0.09. Find a 90% confidence interval for the population mean length of nails produce by the machine. Please input the upper limit of the confidence interval.
Solutions
orchestra answered 2 years agoRelated Solutions
A machine at Katz Steel Corporation makes 3-inch-long nails. The probability distribution of the lengths of...
A machine at Katz Steel Corporation makes 3-inch-long nails. The
probability distribution of the lengths of these nails is
approximately normal with a mean of 3 inches and a standard
deviation of 0.08 inch. The quality control inspector takes a
sample of 16 nails once a week and calculates the mean length of
these nails. If the mean of this sample is either less than 2.96
inches or greater than 3.04 inches, the inspector concludes that
the machine needs an...
A machine at Katz Steel Corporation makes 5-inch-long nails. The probability distribution of the lengths of...
A machine at Katz Steel Corporation makes 5-inch-long nails. The
probability distribution of the lengths of these nails is
approximately normal with a mean of 5 inches and a standard
deviation of 0.08 inch. The quality control inspector takes a
sample of 16 nails once a week and calculates the mean length of
these nails. If the mean of this sample is either less than 4.95
inches or greater than 5.05 inches, the inspector concludes that
the machine needs an...
A machine at Katz Steel Corporation makes 4-inch-long nails. The probability distribution of the lengths of...
A machine at Katz Steel Corporation makes 4-inch-long nails. The
probability distribution of the lengths of these nails is
approximately normal with a mean of 4 inches and a standard
deviation of 0.08 inch. The quality control inspector takes a
sample of 25 nails once a week and calculates the mean length of
these nails. If the mean of this sample is either less than 3.95
inches or greater than 4.05 inches, the inspector concludes that
the machine needs an...
A machine at Katz Steel Corporation makes 4-inch-long nails. The probability distribution of the lengths of...
A machine at Katz Steel Corporation makes 4-inch-long nails. The
probability distribution of the lengths of these nails is
approximately normal with a mean of 4 inches and a standard
deviation of 0.10 inch. The quality control inspector takes a
sample of 16 nails once a week and calculates the mean length of
these nails. If the mean of this sample is either less than 3.96
inches or greater than 4.04 inches, the inspector concludes that
the machine needs an...
A random sample of 10 batteries is obtained. It is determined that the mean life is...
A random sample of 10 batteries is obtained. It is determined
that the mean life is 5 hours, with a sample standard deviation of
1 hour.
A)Find the 95% confidence interval (CI) for the unknown mean of
the population.
B)Interpret the meaning of the confidence interval.
The following sample of lengths was taken from 8 nails off the assembly line. Construct the...
The following sample of lengths was taken from 8 nails off the
assembly line. Construct the 90% confidence interval for the
population variance for all nails that come off the assembly line.
Round your answers to two decimal places.
19.3,19.1,19.6,19.7,19.1,19.2,19.0,19.0
Lower Endpoint: ??? and Upper Endpoint: ???
A) Machine A produces an average of 10% of defective parts. Machine B produces on average...
A) Machine A produces an average of 10% of defective parts.
Machine B produces on average twice as many defective parts as
machine A. Machine C produces on average three times more defective
parts than machine B. Here are 8 bags of parts from A, 2 bags of
parts from B and 1 bag of coins from C. We randomly take a coin
from one of the bags itself also taken at random. She is
defective.
1. What is the...
A tool-and-die machine shop produces extremely high-tolerance spindles. The spindles are 18-inch slender rods used in...
A tool-and-die machine shop produces extremely high-tolerance
spindles. The spindles are 18-inch slender rods used in a variety
of military equipment. A piece of equipment used in the manufacture
of the spindles malfunctions on occasion and places a single gouge
somewhere on the spindle. However, if a defective spindle can be
cut so that it has 14 consecutive inches without a gouge, then it
can be salvaged for other purposes. Assume that the location of the
gouge along a defective...
A machine produces metal pieces that are cylindrical in shape. A sample of these pieces is...
A machine produces metal pieces that are cylindrical in shape. A
sample of these pieces is taken and the diameters are found to be
1.02, 0.95, 1.03, 1.07, 0.98, 0.98, 0.99, 1.01, and 1.06
centimeters. Compute the sample mean x, the sample standard
deviation s and the median of the sample. Determine the 95%
confidence interval for the mean. Assume an approximately normal
distribution for the diameter random variable. (Hint: Use the
t–distribution.)
1) How many g/in^3 in 3.11 x 10^3 g/dm^3? 2) 1.00 in^3 (cubic inch) of a...
1)
How many g/in^3 in 3.11 x 10^3 g/dm^3?
2) 1.00 in^3 (cubic inch) of a material has a mass of 0.240
lb. How many liters of this material would weigh 3.30 kg?
3) 1.00 in^3 of a metal weighs 0.544 pounds. What is the mass
in kg of 7.80 L of this metal?
4) When you perform the following operations, how many
significant figures should your answer have? (1.20000 x 10^4 g) +
(2.41 x 10^2)
5) When you...
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