A Test of Spelling Ability Is Given to a Random

question 97

Multiple Choice

A test of spelling ability is given to a random sample of 10 students before and after they completed a spelling course.The mean score before the course was 119.60 and after the course the mean score was 130.80.The standard deviation of the difference was 16.061.Calculate a 99% confidence interval.

• A)(-3.13 25.53)
• B)(6.12 16.28)
• C)(-1.88 24.28)
• D)(-5.31 27.71)

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Definitions:

Variance

A measure of how much values in a data set differ from the mean of the data set.

Binomial Distribution

A probability distribution that summarizes the likelihood of a value taking one of two independent states and is used for experiments that have two possible outcomes (success or failure).

P

Generally denotes probability, representing the likelihood of a particular event or outcome occurring.

Binomial Distribution

The binomial distribution is a discrete probability distribution that describes the outcome of a fixed number of trials in which there is a constant probability of success.