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According to a Recent Survey, Women Chat on Their Mobile

question 20

Essay

According to a recent survey, women chat on their mobile phones more than do men (CNN.com, August 25, 2010). To determine if the same patterns also exist in colleges, Irina takes a random sample of 40 male students and 40 female students in her college. She finds that female students chatted for a sample average of 820 minutes per month, with a sample standard deviation of 160 minutes. Male students, on the other hand, chatted for a sample average of 760 minutes per month, with a sample standard deviation of 240 minutes. It is not reasonable to assume equal population variances.
A) Specify the competing hypotheses to determine if female students chat more, on average, than male students.
B) Calculate the value of the test statistic and its p-value.
C) Make a conclusion at the 5% significance level.

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Definitions:

Procedural Memories

A type of long-term memory involved in learning and performing tasks and skills, such as riding a bike or typing, which operates often without conscious awareness.

Amygdala

A structure within the brain's temporal lobe that is involved in emotional responses, decision-making, and memory processing, particularly known for its role in fear and pleasure responses.

Serial Position

A cognitive phenomenon where an individual is more likely to recall the first and last items in a series of objects or words, known as the primacy and recency effect, respectively.

Primacy Effect

The tendency to remember information that is presented first more effectively than information that is presented later.