Exhibit 12-1 a Card Dealing Machine Deals Spades (1),hearts (2),clubs

question 3

Multiple Choice

Exhibit 12-1 A card dealing machine deals spades (1) ,hearts (2) ,clubs (3) ,and diamonds (4) at random as if from an infinite deck.In a randomness check,1,600 cards were dealt and counted.The results are shown below. Refer to Exhibit 12.1.At the 5% significance level,the critical value is:

• A)6.251
• B)7.815
• C)9.348
• D)11.345

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Definitions:

Hypothesis Test Method

A procedure in statistics to determine whether there is enough evidence in a sample of data to conclude that a certain condition holds for the entire population.

Confidence Interval Method

A statistical technique that constructs an interval estimate of a population parameter based on sample data.

Populations

The entire collection of individuals, items, or data under study in a statistical analysis.

Sample Standard Deviations

A measure of the dispersion or variability of data points in a sample from their mean.