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A multiple-choice exam consists of 16 questions, each with five alternatives. A student needs to answer at least 12 of the questions correctly in order to pass the exam. (a) What is the probability that George passes the exam if he guesses at random on each question? What is George's expected number of correct answers? What is the variance of the number of his correct answers? (b) What is the probability that Ann passes the exam if she knows the first two answers and guesses at random on the rest:? What is Ann's
Evaluate each expression-Diameter of a circle. If the diameter of a circle is 1.3 * 10^-12 meters, then what is the radius?
a population consists of 45 items 35 of which are defective. in a sample of 4 items what is the probability that
report shows that 45 of all us households owned 2 cars in 2000. set up the null and alternative hypothesis for testing
As part of this trial, they want to find out whether there is a difference between effectiveness for women and for men. At = .05, what is the test value?
a machine that produces a major part for an airplane engine is monitored closely. in the past 10 of the parts produced
How large a sample should be tested in order to be 99% confident that the true proportion of inedible fish is estimated to within 7%? Use 2.575 as the critical value for a 99% confidence interval.
What proportion of time will it take clean-up crew 56 or more hours for cleaning plant? Define the lower and upper limits of interval.
the yield of wheat from eight test plots is as follows1.2 2.2 1.9 1.1 1.8 1.4 1.6 2.1 tons per acretest at the 1 level
The diameters of oranges in the certain orchard are normally distributed with the mean of 5.26 inches and a standard deviation of 0.50 inches.
What is the value of sample mean? If the interval represents 90 % confidence interval, what would the 99 % confidence interval be?
The significance level of a statistical test is equal to the probability that the null hypothesis is true.
a manufacturer of nickel-hydrogen batteries randomly selects 100 nickel plates for test cells cycles them a specified
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