A Manufacturer Claims That a Certain Brand of VCR Player

question 41

Essay

A manufacturer claims that a certain brand of VCR player has an average life expectancy of 5 years and 6 months with a standard deviation of 1 year and 6 months. Assume that the life expectancy is normally distributed.
(a)Selecting one VCR player from this brand at random, calculate the probability of its life expectancy exceeding 7 years.
(b)The Critical Consumer magazine decides to test fifty VCRs of this brand. The average life in this sample is 6 years and the sample standard deviation is 2 years. Calculate a 99% confidence interval for the average life.
(c)How many more VCRs would the magazine have to test in order to halve the width of the confidence interval?

Identify different types of charts and tables suitable for various data presentation needs.

Understand how to emphasize specific parts of visuals such as pie chart slices.

Recognize the use of special formats like pull quotes to enhance document presentation.

Understand the presentation and emphasis mechanisms in tables, including the indication of missing data.

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Definitions:

Brand New

Something that is entirely new and has never been used before.

Subjective Well-Being

An individual's personal assessment of their happiness and life satisfaction.

Aerobic Exercise

Physical activity that improves cardiovascular fitness by raising the heart rate and increasing the body’s use of oxygen.

Overestimate

To assess a quantity or value too high in relation to its actual value.