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1. Draw a histogram and a frequency polygon for the following data:
Class: 0-10 10-20 20-30 30-40 40-50 50-60 60-70
Frequency: 6 8 10 15 13 8 5
2. Represent the data given below with a suitable diagram.
Items
Value in Rs. in1997-98
Value in Rs. in 1998-99
Raw material
150
200
Labour
100
Power
75
Advertisemen t
25
Other charges
50
Total cost of manufacturing
400
900
Sample standard deviation of 1.1%. Using alpha = 0.05, does the analyst have statistical evidence to reject the claim made by the magazine?
Write a memo explaining what the regression means. If the average water hardness is 3 and the chief would like to replace any pump with a probability of failing of .80 or more, at what age should pumps be replaced?
heights of men on a basketball team have a bell shaped distribution with a mean of 173cm and a standard deviation of
A company is filling bags of rock salt to a level of 50 pounds. It believes that all bags are filled correctly, but would like to use a hypothesis test with an alpha of 0.05 to check this belief.
You want to determine if your widgets from machine 1 are the same as machine 2. Machine 1 has a sample mean of 50 and a population standard deviation of 5 and a sample size of 25.
What is the probability a random sample of 75 students will provide a sample mean Sat score within 20 of the population mean?
According to the Bureau of Economic Analysis, the savings rate of American households, defined as a percentage of the disposable personal income, was 4.20% in 2009.
a laptop manufacturer finds that the average time it takes an employee to load a laptop with software is 40 minutes
A month is classified as "extremely wet" if the amount of rainfall is in the upper 10% for that month. How much precipitation must fall before a month of April is classified as "extremely wet".
Explain why or why not and then use that approximation to find this probability
consider a data set in which all observations are equal. find the range variance and standard deviation for this data
Standard deviation is 250 pounds. if you pull a weight of at least 4200 pounds with this tow chain, what percentage of time would you expect the chain to break.
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