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1. A group of employees at a large factory was asked to indicate their preference for one of two pension schemes. The table below gives the responses of three different categories of employees at the factory. Investigate at 1% level of significance whether or not there is a preference amongst the three categories. (show all work)
JOB CATEGORY PLAN A PLAN BSUPERVISOR 10 15CLERICAL 20 80LABOUR 80 60
2. An airline advertises its flights between two major cities takes at most five hours. A random sample of 36 such flights gave a mean time of five hours ten minutes with a standard deviation of thirty minutes. Investigate the validity of the airlines advertisement claim at the 5% level of significance.
A lot of n items comprises k defectives, and m are chosen randomly and inspected. How must the value of m be selected so that probability that at least one defective item turns up is .90?
A stockbroker at Critical Securities reported that the mean rate of return on a sample of 10 oil stocks was 12.6 percent with a standard deviation of 3.9 percent. The mean rate of return on a sample of 8 utility stocks was 10.9 percent with a stan..
Office Visits what is the age distribution of patients who make office visits to a doctor or nurse?
Inspect table produced in question 2 above. Comment on relative sensitivity of minimum sample size to actual proportion and to desired half width.
The accounting department at Weston Materials, Inc., national manufacturer of unattached garages, reports that it takes two construction workers mean of 32 hours and standard deviation of 2 hours to erect the Red Barn model.
Set up hypotheses and carry out all relevant tests. Describe all results and implications which you have discovered.
In a recent survey 35 percent indicated chocolate was their favorite flavor of ice cream. Suppose we select a sample of 10 people and ask them to name their favorite flavor of ice cream.
The Starbucks in the Bauer College of Business found that 24% of customers purchase more than one cup of coffee per day from their shop. If 180 customers are randomly selected one day, what is the probability that no less than 25% of them purchase..
The Speedy Oil Change Company advertised a 15-minute wait for an oil change. A sample of 23 oil changes showed a mean time of 16.5 minutes and a standard deviation of 4.3 minutes.
A study on body types gave the following results: 45% were short; 25% were short and overweight; and 24% were tall and not overweight.
Using the empirical rule, what is the approx percentage of cans of regular coke with weights between 0.80931 lbs. and 0.82433 lbs?
Compute the relative frequencies and percentages for all classes. Draw a histogram and a polygon for the relative frequency distribution.
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