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1. (a) Prove that the some of the squared deviations is least when taken from the mean.
(b) Dispersion is known as the average of the second order. Give reasons.
2. (a) Which measure of dispersion would be most useful for:
(i) a social worker,
(ii) an actuary.
(iii) A public relations man for industry, and
(iv) a spokesman for organised labour?
(b) What is coefficient of dispersion? What purpose does it serve?
A question has these possible choices - excellent, very good, good, fair, and unsatisfactory. How many degrees of freedom are there using the goodness-of-fit test to the sample results?
q1 an electronics company is about to launch a new product. if the serial number for each piece produced has the
silicone implant augmentation rhinoplasty is used to correct congenital nose deformities. the success of the procedure
abc university administration has hired your group as business consultants to determine whether the university should
Why is an interval estimate for the population preferred to a point estimate? In real business practices, is information about the population mean available? Discuss
the correlation between the number of police on the street and the number of crimes committed for a sample of 15
If a soccer game ends in a tie, it goes into a penalty kick shootout in which each team chooses five players to take penalty kicks. The team that makes the most subsequent penalty kicks wins the game.
assuming that the population proportion p is near 0.3 find the sample size required to construct 90 confidence interval
A company has developed the new battery, but the average lifetime is unknown. In order to estimate the average, a sample of 150 batteries is tested and an average lifetime of this sample is found to be 250 hours.
suppose that an investigator believes that virtually all values in the population are between 38 and 70. the
The Federal minimum wage is $7.25 (effective July 2009). If an employee earns the new minimum wage, how many complaints can that employee expect to receive?
Create a 90 percent confidence interval for the population proportion of all such firms with this as the primary motivation.
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