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Suppose that a device stops working if one of its five components fails, and suppose that the lifetimes of the five components are exponentially distributed with means 10000,15000,20000,25000,and 50000 (in hours). Assuming that the component lifetimes are independent, what is the probability that the device keeps working for at least 10000 hours?
using the simple random sample of weights of women from a data set we obtain these sample statistics n40 and x146.82
She asked her assistant for a 95% confidence interval, approximately how large a sample did her assistant use to determine the interval estimate?
question one-sample tests of hypothesisstate the null and alternative hypothesisstate the decision
Determine whether a normal distribution or a t-distribution should be used or whether neither of these can be used to construct a confidence interval.
Shoppers enter Hamilton Place Mall at an average of 120 per hour, and the number and shoppers is Poisson distributed. What is the probability that at least 5 shoppers will enter the mall between 5:00 and 5:05 p.m.?
A mortar shell is s feet above the ground after t seconds, where s=f(t)= -16t + 510t +63. Find the height of the shell 15 seconds after it is fired.
Confirm that these statements are accurate by finding the geometric mean rate of increase.
suppose that you arrive at a single-teller office to find three customers waiting in line and one being served. if the
At the .01 significance level, is there a difference in the mean number of times men and women order take-out dinners in a month? What is the p-value?
If a sample of 20 dish owners is randomly selected the what would be the probability that more than 11 dish owners in the sample subscribe to at least one premium movie channel?
suppose that the distribution of keyboarding speeds for students who have completed a two- week keyboarding course is
A dataset has 1000 records and 50 variables with 5% of the values missing, spread randomly throughout the records and variables. An analysis decides to remove records that have missing values. About how many records would you expect would be remov..
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