A Sample Is Used to Obtain a 95% Confidence Interval

question 21

True/False

A sample is used to obtain a 95% confidence interval for the mean of a population.The confidence interval goes from 78.21 to 87.64.If the same sample had been used to test the null hypothesis that the mean of the population differs from 90,the null hypothesis could be rejected at a level of significance of 0.05.

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Definitions:

Class Width

The difference between the upper and lower boundaries of any class (category) in a frequency distribution.

Data Set

A collection of related sets of information that is composed of separate elements but can be manipulated as a unit by a computer.

Total Frequency

The sum of all frequencies in a data set, representing the total number of times a data point or category occurs.

Stem-and-Leaf Displays

A method of displaying quantitative data where each number is split into a "stem" (the leading digit(s)) and a "leaf" (the last digit).