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A local unemployment office keeps track of the number of new claims filed each day. Based on data collected, it determines that the expected number of new claims filed per day is 2.4 with a standard deviation of 0.8688. Suppose that the office is open five days per week. What is the expected number of new claims filed per week at this office?
a. 6
b. 8
c. 10
d. 5
e. 12
A regression equation was computed to be Y'=35+ 6X. The value of the 35 indicates that
What is the probability that a single randomly sampled battery of this type lasts longer than 100 minutes. Does this suggest that a charge-life exceeding 100 minutes would be unusual?
A researcher wishes to estimate with 99% confidence, the proportion of adults who have high-speed Internet access. Her estimate must be accurate within 2% of the true proportion.
Contruct a confidence interval for the proportion of non-fatal accidents that involved a cell phone at a 95% confidence interval.
Set up the null and alternative hypotheses to see if the data show that it does indeed take seniors longer than 15 seconds to cross the street. In terms of traffic flow, what are the implications of a Type I error?
A machine has three components working independently. The probability that Component A fails is 0.1, the probability that component B fails is 0.2, and the probability that component C fails is 0.3.
Paul has calculated the indifference probability for the lottery having a payoff of $160K with probability p and -$80K with probability (1-p) as follows:
A sample of 49 observations is taken from a normal population. The sample mean is 55 and the sample standard deviation is 10. Determine the 99% confidence interval for the population mean.
One item on a questionnaire asks, "How many siblings (brothers and sisters) did you have when you were a child?" A researcher computes the mean, the median, and the mode for a set.
You only worry if there is at least a 50 or more percent chance that you have the disease. Suppose that test has same specificity = p For what value of p will you start to worry?
if you draw 7 cards at random from a standard deck of 52 cards what is the probability that you will get exactly two
the is the process of first stating the basic problem and then developing additional questions by subsequently
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