SCENARIO 7-3 The Lifetimes of a Certain Brand of Light Bulbs Are

question 23

Short Answer

SCENARIO 7-3
The lifetimes of a certain brand of light bulbs are known to be normally distributed with a mean of 1,600 hours and a standard deviation of 400 hours.A random sample of 64 of these light bulbs is taken.
-Referring to Scenario 7-3,the probability is 0.15 that the sample mean lifetime is more than how many hours?

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Definitions:

Expected Frequency

The anticipated count in each category of a contingency table under the assumption that the null hypothesis is true, used in chi-square tests.

Null Hypothesis

The null hypothesis is a statement in statistical analysis that proposes no significant effect or no difference as the outcome of an experiment or study.

Level of Significance

The probability threshold under which the null hypothesis is rejected in hypothesis testing, denoted as alpha.

Null Hypothesis

A default position that there is no difference or effect in a particular situation, used as a starting point for statistical hypothesis testing.