Summary statistics for two samples of data are
sample 1: Mean = 5 standard deviation = 12
sample 2: Mean =12 standard deviation = 5
which sample has a larger spread of observations?
a) Sample 1
b) Sample 2
c) Neither, they have the sample spread.
d) there is no enough information to answer this question.
A convenience store chain claims that the mean amount spent by a typical customer is $28.50 with a standard deviation of $ 2.50. Assume that the distribution of amounts spent is bell-shaped (symmetric).
The Z- score for the amount spent yesterday by a customer which made a purchase of $32.25 =
write the answer in decimal form.
Is this amount unusual?
Type Yes or no.
Consider the following ordered set of data
44 49 50 51 53 57 58 62
66 66 68 71 75 77 80 85
What is the interquartile range (IQR)