The Professor's Response

Professor I section 7.3 question number 3

A child psychologist wants to estimate the time it takes a child to respond to a question

with a lie while playing the video game Tetris. If the researcher wants to estimate the

average time to respond within a margin of error of 0.10 seconds, and he wants to use

98% confidence, how many children does he have to time while they attempt to

respond with a lie? Assume the standard deviation of response times is 0.6 seconds.

i got 196 children

i used 2.33 for Z is that where i got it wrong ?

See the professor's answer below.

You should use the t-table whenever it is possible to do so because of the extra decimal place of precision. This will ensure that we always get the same value for the answer.