A Computer Password Is Composed of Seven Characters

question 25

Multiple Choice

A computer password is composed of seven characters. If each character must be a letter (A - Z) , then how many different passwords can be constructed so that the password is the same both forwards and Backwards? (Note: Examples would be ETTFTTE or RACECAR.)

• A) 245712
• B) 358800
• C) 456976
• D) 5866254125
• E) None of the above.

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Definitions:

Stratified Random Sampling

A method of sampling that involves dividing a population into smaller groups, known as strata, that share similar characteristics, and then randomly selecting members from each stratum for study.

Chi-Square Distribution

A statistical distribution used in hypothesis testing that is applicable to variables measured on an interval scale, often used to analyze categorical data.

T-Distributions

A type of probability distribution that is symmetric and bell-shaped, used in hypothesis testing, especially when the sample size is small or the population variance is unknown.

Confidence Interval

A sequence of numerical figures, extracted from sampling data, likely to hold the value of an unobserved population parameter.