Videocassette Recorder (VCR) Tapes Are Designed So That Users Can

question 59

Essay

Videocassette recorder (VCR) tapes are designed so that users can repeatedly record new material over old material. However, after a number of re-recordings the tape begins to deteriorate. A VCR tape manufacturer is experimenting with a new technology, which hopefully will produce longer-lasting tapes. Thirty of the old-style tapes and 30 utilising the new technology were used in an experiment. The tapes were used to record and re-record programs until they began to deteriorate. The number of re-recordings is assumed to be normally distributed. It is generally accepted that the number of
re-recordings should exceed 55. Any tapes that do not meet this criterion are considered to be unacceptable. The number of re-recordings were observed and shown in the accompanying table. $$\begin{array} { | cc c |c c c | } \hline { \text { Old-style tapes } } &&& { \text { New-technology tapes } } \\\hline 60 & 61 & 48 & 68 & 70 & 58 \\\hline 51 & 46 & 66 & 74 & 72 & 69 \\\hline 66 & 63 & 61 & 77 & 73 & 49 \\\hline 73 & 55 & 71 & 59 & 66 & 61 \\\hline 71 & 49 & 76 & 52 & 58 & 59 \\\hline 47 & 56 & 55 & 66 & 51 & 49 \\\hline 60 & 62 & 64 & 62 & 59 & 57 \\\hline 52 & 51 & 63 & 51 & 56 & 66 \\\hline 64 & 68 & 52 & 50 & 55 & 76 \\\hline 47 & 55 & 58 & 63 & 68 & 78 \\\hline\end{array}$$ Determine whether these data are sufficient to infer at the 10% significance level that the two population variances differ.

Identify symptoms and diagnostic criteria for obsessive-compulsive disorder.

Recognize the signs of depressive disorders and their impact on daily functioning.

Understand dissociative disorders and their triggers.

Comprehend the concept of preparedness in the development of phobias.

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Definitions:

Firecrackers

Small explosive devices primarily used for entertainment, especially in celebrations, producing a loud noise and visual effects upon ignition.

Conditioned Stimulus

A stimulus that was once neutral but, after pairing with the unconditioned stimulus, begins to provoke a conditioned response.

Firecrackers

Small explosive devices primarily used for entertainment purposes, especially in celebrations, that create a loud noise when detonated.

Fourth Of July

An American holiday celebrated on July 4th, commemorating the Declaration of Independence from Britain in 1776.