Use the Normal to Model the Distribution of Sample Proportions

question 12

Multiple Choice

Use the Normal to model the distribution of sample proportions.
-According to a recent survey, about 33% of Americans polled said that they would
Likely purchase reusable cloth bags for groceries in order to reduce plastic waste.
Suppose 45 shoppers are interviewed a local supermarket. What is the probability that
Between 28% and 38% of shoppers say that they are likely to purchase reusable cloth
Bags for groceries?

• A) 0.2389
• B) 0.7611
• C) 0.4778
• D) 0.5222
• E) 0.3769

Comprehend the impact of changing confidence levels on confidence interval precision.

Recognize the implications of unknown population standard deviation on interval estimation.

Apply formulas for calculating confidence intervals in practical situations.

Understand the concept and application of skill-based pay systems.

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Definitions:

Confidence Interval

A span of numbers obtained from sample data, which probably includes the value of an unknown parameter from the overall population.

Sample Variance

A statistical measure that quantifies the degree to which sample points differ from the sample mean.

Population Mean

The arithmetic average of a set of values or a distribution in the entire population, representing the central location of the data.

Tire Rotation

The practice of moving the wheels and tires of a vehicle from one position to another to ensure even tire wear.