Question

A new drug is designed to reduce a person's blood pressure. Eight randomly selected hypersensitive patients receive the new drug. Suppose the probability that the hypersensitive patient's blood pressure drops if he/she receive the new drug is 0.5. What is the mean and standard deviation of this distribution?

Answer 1

what is the defn of STD again

Answer 2

STD?

Answer 3

standard deviation

Answer 4

"a quantity calculated to indicate the extent of deviation for a group as a whole."

Answer 5

i want the formula for it

Answer 6

That's what I am confused about. Which formula should I use? There's several

Answer 7

theres one main formula for STD

Answer 8

Could you please share what it is?

Answer 9

http://libweb.surrey.ac.uk/library/skills/Number%20Skills%20Leicester/page_19.htm

Answer 10

Thank you. Is there an online calculator I could use?

Answer 11

your sample size is pretty small, so ur mean is 4

Answer 12

Most STD calculators require the range of data set but this one doesn't have it

Answer 13

Is the STD 2?

Answer 14

u can generate it

Answer 15

I see! Thank you so much!

Answer 16

umm lemme see

Answer 17

I have one last question!

Answer 18

sqrt(npq) = sqrt(8*1/2*1/2) = sqrt(4) = 2

Answer 19

ya it is 2

Answer 20

i cant tell u why that formula works exactly, but there is a way to work it out

Answer 21

but when ur given a sample size, and its one of these success failure ones
then sqrt(npq) is the STD

Answer 22

The following data represent a random sample of 9 scores on a statistics quiz:
Quiz Scores: 7,9,7,5,5,8,3,10,9

The scores are known to have a Normal distribution and the sample standard deviation is s=2.29. Construct a 95% confidence interval to estimate the population mean.

Answer 23

where n is sample size,p is success and q is failure prob

Answer 24

okay

Answer 25

you need to know the relationship between sample SD and true SD