Assume That a Simple Random Sample Has Been Selected from a Normally

question 118

Essay

Assume that a simple random sample has been selected from a normally distributed population. Find the test statistic, P-value, critical value(s), and state the final conclusion.
-A light-bulb manufacturer advertises that the average life for its light bulbs 900 hours. A random sample of 15 of its light bulbs resulted in the following lives in hours. $$\begin{array} { l l l l l l l l } 995 & 590 & 510 & 539 & 739 & 917 & 571 & 555 \\916 & 728 & 664 & 693 & 708 & 887 & 849 &\end{array}$$ At the 10% significance level, do the data provide evidence that the mean life for the company's light bulbs differs from the advertised mean?

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Definitions:

Schaie's View

Schaie's view refers to the developmental model of cognitive changes over the lifespan proposed by psychologist K. Warner Schaie, emphasizing the sequential stages of cognitive development from childhood to old age.

Cognitive Development

describes the processes by which individuals learn to think, reason, and use language, progressing through various stages from infancy to adulthood.

Day Care Center

A facility that provides care and education for children while their parents or guardians are at work or otherwise engaged.

Vividness Effect

Occurs during decision-making when some salient or vivid facts attract our attention regardless of their actual value as evidence.