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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?
Define what a hypothesis is and discuss the relationship between hypothesis testing and statistics. Discuss what independent and dependent variables are in an experiment, state the relationship between the two and give an example.
Determine and interpret a 95% confidence interval for the mean amount of time Americans age 15 or older spend eating and drinking each day.
A very large shipment of parts contains 10% defectives. 2 parts are chosen at random from the shipment and checked. Let the random variable X denote the number of defectives found. Find the probability distribution of this random variable.
two students were asked to rate six different television shows on a scale from 1 to 10 points with higher values
Find the standard error of the mean Also establish an interval estimate around the sample mean using one standard deviation of the mean.
1.a forester wishes to predict the volume in cubic feet of usable lumber in a certain species of tree using the height
What is the probability that the sample will have between 50% and 60% of the identifications correct? What is the probability that the sample percentage of correct identifications is greater than 65%?
The following lab is to give you a chance to generate your own graphs and statistics using software.
You are to find the state-machine diagram for the following electronic vending-machine specification. The vending machine sells jawbreaker candy, one jawbreaker for 25¢.
a company conducts random drug tests each month employee selections are independent of any previous months selections.
A system is tested for 10,000 hours and experiences 2 failures. Its failure rate is believed to be Poisson distributed.
1. you have obtained a sub-sample of 1744 individuals from the current population survey cps and are interested in the
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