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In 1987, there were 342,970 cell phone subscribers in the United States. By 2008, the number of cell phone subscribers increased to 262,438,000. What is the geometric mean annual increase for the period?
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
a typing competency test yields scores which are normally distributed with a mean of 80 and a standard deviation of 10.
An averageof 2 cars arrive at a highway tollgate every 10 seconds. If this rate is approximated by a Poisson process, what is the probability that exactly 3 cars will arrive in a 10-second period?
Can researcher conclude that humidity has significant effect on eating behavior? Use a two-tail test with α = .05. Calculate estimated Cohen's d and r2 to measure size of treatment effect.
use either the critical-value approach or the p-value approach to perform the required hypothesis test.independent
Is it true that one of the major assumptions underlying ANOVA is that all the populations being studied in the experiment have the SAME distribution?
a doctor wants to estimate the hdl cholesterol of all 20-to 29- year-old females. how many sunjects are needed to
q1. a high volume production process produces on average 3.4 defective parts per hour and the number of defects in an
Determine the percentage of defective washers produced by this machine, assuming the diameters are normally distributed.
With a selling price of 40 dollars each, how many pool cues must be sold to break even? What would the total revenue be at this break even point?
To test this notion, eight paid volunteers were placed (individually) in a room in which there was no light from the outside and no clocks or other indications of time.
The average service time at CheesePlate Restaurant is 3.5 minutes with a standard deviation of .04 minutes. A new order system claims it can improve service time
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