Listening to music has long been thought to enhance intelligence, especially dur
ID: 3319518 • Letter: L
Question
Listening to music has long been thought to enhance intelligence, especially during infancy and childhood. To test whether this is true, a researcher records the number of hours that eight high-performing students listened to music per day for 1 week. The data are listed in the table.
(a) Find the confidence limits at a 95% CI for this one-independent sample. (Round your answers to two decimal places.)
_________to __________hours per day
Day (in hours) 4.2 4.7 5.1 3.8 4.3 5.4 4.2 4.4
Explanation / Answer
Ans:
Given that
sample size=8
sample mean=4.51
sample standard deviation=0.525
df=8-1=7
critical t value=TINV(0.05,7)=2.365
95% confidence interval for true mean
=4.51+/-2.365*0.525/sqrt(8)
=4.51+/-0.44
=(4.07, 4.95)
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