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The managing director of a company is having a discussion with the employee's representative regarding pay increases for the coming year. As a basis for their discussions both have investigated the present national average for the company's sector. The MD claims that the national average salary is £36 000 whereas the employee's representative claims the average to be £28 000.
a. If both ‘averages' are correct how can you reconcile the differences?b. What other information should be obtained so that an agreement on pay increases could be reached?
Suppose that 80% of all batteries have acceptable voltages, and let y denote the number of batteries that must be tested. What is p(2), that is, P(y=2).
If a statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 48.0 and 53.0 minutes what is the probability that a given class period runs greater than 51.25 minutes.
How is the standard deviation of the data affected if there are disproportionately more 0s and 5s? Why can't we use the methods of this section to test that the last digits of the sample data have a standard deviation equal to 3?
Suppose that four tickets will be given prizes in a lottery having 30,000 tickets. What is the probability of winning at least one prize if you buy 1,000 tickets?
Evaluate the value of population proportion. Develop a 99% confidence interval for population proportion.
ferrari a leading manufacturer of formula one race cars claims that the average acceleration time to go from zero to
A carpet company advertises that it will deliver your carpet within 15 days of purchase. A sample of 49 past customers is taken. The average delivery time in the sample was 16.2 days.
Should the hypothesis be accepted at the 1% level of significance that the population means are the same for each (a) Octane of gasoline? (b) Type of car?Table Miles per Gallon for Each of 4 Octanes
a security camera is used to monitor a particular survillence area to report wheather there is any threat present or
5 cards are drawn from a standard deck without replacement. What is the probability that at least one of the cards drawn is a heart? Express your answer as a fraction or a decimal number rounded to four decimal places.
Set up H0 and Ha for testing whether the true percentage of TV viewers who find cable news to be better quality than network news differs from 50%.
Unfortunately, the random variable in question is exponentially distributed; the sample size of 10 is considerably smaller than is required for a normal approximation to be valid for the sampling distribution of the sample mean; and therefore no ..
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