EssayNICE | 24/7 Homework Help

Psychologists in Montreal and Toronto conducted a study to
determine if babies show any preference for speech over general
noise.¹ Fifty infants between the ages of 4-13 months
were exposed to both happy-sounding infant speech and a hummed
lullaby by the same woman. Interest in each sound was measured by
the amount of time the baby looked at the woman while she made
noise. The mean difference in looking time was 27.79 more seconds
when she was speaking, with a standard deviation of 63.18 seconds.
Perform the appropriate test to determine if this is sufficient
evidence to conclude that babies prefer actual speaking to
humming.

¹Corbeil, M., Trehub, S.E., Peretz, I., “Speech vs.
singing; infants choose happier sounds,” Frontiers in
Psychology, 25 June, 2013.

	Correct.

State the null and alternative hypotheses.

Use μ1 for μd in the response area.

	Incorrect.

Calculate the relevant test statistic.

Round your answer to three decimal places.

t-statistic=

the absolute tolerance is +/-0.02

	Incorrect.

Find the p-value.

Round your answer to four decimal places.

p-value =

the absolute tolerance is +/-0.0005

	Correct.

What is the conclusion?

	Correct.

Do we have evidence to conclude that babies prefer speaking to
humming?