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QUESTION FIVE The diameter of shafts produced in a machine follows a normal distribution with the...
QUESTION FIVE
- The diameter of shafts produced in a machine follows a normal distribution with the variance of 81mm. A random sample of 36 shafts taken from the production has its mean diameter of 30mm. Find a 95% confidence interval for the diameter of shafts.
- The Marketing manager of a company feels that 42% of retailers will have enhanced weekly sales after introducing an advertisement at the point of sales. A sample of 36 retailers shops of the company, where the point of sales advertisement has been displayed, reveals that only 18 of them are having enhanced sales after displaying the advertisement. Find the 95% confidence interval for the proportion representing the enhanced sales.
c. The Finance manager of a company feels that 55% of branches will have enhanced yearly collection of deposits after introducing a hike in interest rate. Determine the sample size such that the mean proportion is with plus or minus 0.05 confidence level of 90%?
Solutions
milcah answered 1 year agoRelated Solutions
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b) If the mean of the process changes to 10.5 cm, what is the
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The diameters of steel shafts produced by a certain manufacturing process should have a mean diameter...
The diameters of steel shafts produced by a certain
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The diameter is known to have a standard deviation of 0.0001 inch.
A random sample of 10 shafts was performed and the average diameter
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c. Find the P-value for this test.
d. Construct a...
The diameters of steel shafts produced by a certain manufacturing process should have a mean diameter...
The diameters of steel shafts produced by a certain
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The diameter is known to have a standard deviation of 0.9 inches. A
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(a) Find a 90% confidence interval for the mean diameter to
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(b) Find a 99% confidence interval for the mean diameter to
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(c) How does the increasing and decreasing of the significance
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The diameters of steel shafts produced by a certain manufacturing process should have a mean diameter...
The diameters of steel shafts produced by a certain
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The diameter is known to have a standard deviation of = 0.0003
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Please show your work and...
The distribution of actual weights of 8-oz chocolate bars produced by a certain machine is normal...
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(a) What is the probability that the average weight of a bar in
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(b) For a SRS of four of these chocolate bars,
c) what is the level L such that there is a 3% chance that the...
The distribution of actual weights of 8-oz chocolate bars produced by a certain machine is normal...
The distribution of actual weights of 8-oz chocolate bars
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ANSWER:
(b) For a random sample of three of these chocolate bars, what
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What is the probability that a randomly chosen employee will
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What is the probability that a randomly chosen employee will be
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The diameter of alloy rods produced on an extrusion machine are
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Assume the distribution of home selling prices follows a normal distribution. for this area the mean...
Assume the distribution of home selling prices follows a normal
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Let S be the home selling price. For a randomly selected home
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need to know how to set this question up in a TI-84 calculator
PLEASE! It's urgent!
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