In a random sample of 40 students, the mean
daily time spent using a cell phone was 3.15 hours
with a standard deviation 1.08. construct a 90%
confidence interval for the population mean.
a) 2.87 < u < 3.43
(2.712m43.59
b) 2.82 d) 1.376m 24.93

3, 12, 48, 384, 1536, 6144, 24576, 98304

step-by-step explanation:

just keep timing it by 4.

sine

step-by-step explanation:

step-by-step explanation:

yes, gavin is right.

step-by-step explanation:

gavin is correct. 

this problem is about converting 9% per year to how many percent per quarter. the rate is still the same. it only differed in the time period. so, through dimensional analysis,

9% per year  × (1 year / 4 quarters) = 2.25% per quarter

if he was asked to convert 9% per year to how many percent per quarter  compounded quarterly, then you will not simply divide by four. this is because compounding is not linear.

hope this , have a good day. c;