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A bowler who has averaged 196 pins in the past year is asked to experiment with a ball made of a new kind of material. If he rolls 25 games with the new ball, averaging 204 pins with a standard deviation of 24.9, can one conclude at a level of significance of .01 that the new ball has improved his game?
A project manager at COMSOFT corporation has collected statistics on the organization's software development process. He has the size of each project in number of lines of code for the past 20 projects and the number of lines of code in error disc..
Find a 99% confidence interval for the difference in the mean number of calls between night and day.
Can we conclude that there is a difference in number of citations written between the officers? Use the 0.05 level of significance.
Assume gasoline prices for a region are normally distributed. do the data you obtain provide enough evidence to reject the claim? use 1% level of significance.
If measurements are made over span of 9 months, and results are averaged, find out the probability that neighbourhood is considered unsafe?
The heights were normally distributed, with a mean of 67.8 inches and a standard deviation of 4.0 inches. A study participant is randomly selected. Find the probability that his height is less than 65 inches.
Frequently, tests tha yeild abnormal results are repeated for confirmation. What is the probability that for a normal person a test will be at least 1.5 times as high as the upper limit of normal on two seperate occasions.
Explain the applications of statistics in your own field (Business Administration/Accounting) - Construct a stem and leaf display.
In an attempt to justify this claim, the representative will poll a randomly selected sample of dish owners. The probability that none of the dish owners in the sample subscribes to at least one premium movie channel.
The random variable x is the number of houses sold by a realtor in a single month at the real-estate office. Its probability distribution is:
The following data represent glucose blood levels(mg/100ml) after a 12 hour fast for random sample of 70 women: Employ 6 classes and make a frequency distribution table.
Explain the use of normal probability plot to evaluate whether a set of data is normally distributed? Please discuss in detail.
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