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Problem: Safety engineers must determine whether industrial workers can operate a machine's emergency shutoff device. Among a group of test subjects, 66% were successful with their left hands, 85% with their right hands, and 51% with both hands.
a) What percent of these workers could not operate the switch with either hand?
b) Are success with right and left hands independent events? Explain.
c) Are success with right and left hands mutually exclusive? Explain.
Four of calculators are selected to be sent to local high school. How many selections can be made using original shipment?
Your company asks you to compare a new advertising campaign and the old one. Sample data on the accounts as follows:
If we assume that the distribution of ages is mound-shaped and symmetric. What percentage of the respondents will be between 64.29 and 93.54 years old?
Suppose that a model for the joint distribution of these rvs is a bivariate normal distribution.
Use the normal distribution of SAT critical reading scores for which the mean is 507 and the standard deviation is 121. Assume the variable x is normally distributed.
List the experiments and random run orders if we are to run a fractional design and describe how you would analyse the data in each of the situations defined in (a) and (b) above.
Suppose that the mean of the annual return for common stocks from 2000 to 2012 was 8.5%, and the standard deviation of the annual return was 25.2%.
Of all the combinations of these two stocks, the portfolio with the smallest standard deviation (i.e., the MVP) has weights of 56% in WNOand 44% in RPS. Calculate the standard deviation of the MVP.
Before giving the denition of the binomial probability distribution, try to derive it by using the sample-point approach. How?
a car enters a curved road at speed of 100kmh and slows down with constant decelaration to 50kmh in 12 sec.
assume the car can be purchased for 0 down for 60 months in lieu of rebate. a car with a sticker price of 42050 with
to compute the variance what should one do?a. square the standard deviation.b. take the square root of the standard
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