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You are asked to make a password for a website, the password must be 6 characters in length and may contain upper case and/or lower case letters (upper case letters are considered different from lower case letters), as well as numbers from 0 to 9, but no characters can be repeated
a. How many different passwords are possible?
b. How many passwords are possible if it must contain at least one letter and one number?
c. How many passwords are possible if the password must start with a capital letter?
d. How many passwords do not contain any lowercase letters?
It is generally believed that children brought up in stable families tend to do well in school. To verify such a belief, a social scientist examined.
Briefly explain the meaning of an estimator and an estimate. Also explain the meaning of a point estimate and an interval estimate.
a sample of 85 male professors at a major four-year university produced a mean annual pay of 75600 and a standard
the labor bureau wants to estimate at a 98 confidence level the proportion of all households that receive welfare. the
Test whether it has been an improvement, at level of signi?cance a = 0.01. First, write out the expres- sion for the exact determination of the cut-off point, and secondly, use the CLT for its numerical determination.
Fairfield Homes is developing two parcels near Pigeon Fork, Tennessee. In order to test different advertising approaches, they use different media to reach potential buyers.
a population has a standard deviation of o 24.a. on average how much difference should exist between the population
which of the following statement are false about the chi-suared distribution with v specific valuedegrees of freedom?a
an investigation of the effectiveness of a training program to improve customer relationships included a pre-training
What is the utilization of this service system? What is the average number of students in line?
an urn contains 8 red and 12 white balls. draw one ball at random from the urn. let x 1 if a red ball is drawn and x
A building contractor pays $500 to bid on a contract. If he gets the contract, the probability of which he estimates to be 0.70, he will make a profit of $50,000.
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