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A researcher records the sound (in decibels) during a series of lessons taught by a substitute teacher at a local elementary school. In his study, he found that the sound was 20±2 (M±SD) decibels. Assuming the data are normally distributed, which of the following is an appropriate conclusion? A) 68% of classes were between... B) 95% of classes were between.
Suppose that the distribution of the body mass index for men has a standard deviation of s = 3 kg/m 2 , and we wish to estimate the mean m using a sample of size n = 49. Find the probability that we would be correct within 1 kg/m 2 .
The shelf and purchases it, and he later discovers that the lamp he purchased is defective. What is the probability that the defect came with the first shipment?
The average number of weeks that banner ads run at a Web site is estimated to be 5.5. You want to check the accuracy of this estimate.
John Doe had no accidents in 2004, but his wile Jane did. What are he probabilities for each of them to be low-risk persons?
Let V (t) be the price of a stock, per share, at time t. Suppose that the stock's current value, per share, is $95.00 with drift parameter -$2 per year.
A sampling inspection program has a 0.10 probability of rejecting a lot when the true proportion of defectivesis 0.01, and a 0.95 probability of rejecting the lot when the true proportion of defectives is 0.03. If 0.01 is the AQL and 0.03 is the L..
there are 1000 students in the senior class at a certain high school. the high school offers two advanced placement
If purchasing power parity holds, what is the spot exchange rate between the euro and the dollar? If euros sell for $1.50 (U.S.) per euro
Assume that the hourly cost to operate a commercial airplane follows the normal distribution with a mean of $3,985 per hour and a standard deviation of $440.
A deck of cards is cut into two halves of 26 cards each. As it turns out, the top half contains 3 aces and the bottom half just one ace.
Standard deviation of 8.3 minutes. Assuming normality, at the a = .05 level, is there enough evidence to show the mean oil change time is different?
you fly from philadelphia to san francisco with a connection in dallas. the probability that your flight from
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