Hi to everyone in this forum, I'm a college student having
trouble with statistics and have a final exam in 2 days, so can
someone please help me out. -Here is the question and what I
came up with... A fast-food restaunrat advertises that their
delivery time is less as compared to a national fast-food chain.
To determine whether this advertisement is valid, 10 orders are
placed to each restaurant. Delivery time in minutes are shown
below: It seems that you have calculated the values correctly.
(I checked with R.) Now, you know from the t-table that only 5%
of the t-values will bee larger (in absolute value) than 2.26.
So it would be quite rare to observe a t-value larger than 2.26
if the null hypothesis is true. But you have observed a t-value
as large as 3.04. So, how much do you believe in the null
hypothesis? The t-test is based on the normal distribution. The
data does not really seems to be normally distributed (from a
QQ-plot). Maybe you should ask your teacher how one really
should analyse these data.