Question 866928: #1 Compute the sample mean and Standard Deviation for the data set.
497,193,328,155,326,245,270
I did get the mean part and its 2014/7=287.71 is that right?
i did do the SD part kind of and here what i got for 497-287.71=209.29,193-287.71=-94.71,328-287.71=40.29,155-287.71=-132.71,326-287.71=38.29,245-287.71=-42.71 and 270-287.71=-17.71. i added them and did not add to zero. i need help on that.
#2
a) Calculate the median of the data set
480,790,1000+,350,920,860,570,1000+,170,290
b)
Could you accurately calculate the mean for this data set? why or why not?
#3
Calculate the IQR for this data.
140,195,155,115,195,180,110,110,130,50,60
#4
a) Compute the mean for this data.
17=1,18=8,19=2,20=3,21=3,21=1,23=1,25=1,69=1 all adds to 18/20=0.9 right?
b)Compute the median for this data.
c) Which measure of center is best for this data and why?
#5Compute the sample mean and sample standard deviation for this data.
i got the mean its 532/11=48.36. Here are the numbers= 62,23,27,56,52,34,42,40,68,45,83 same thing i did as in #1 but i add it and its not zero.
#6 which of the two groups has the most varability with respect to caffeine per ounce? Explain your choice in words and show all math calculations you did to arrive at your decision.
Top-Selling Energy Drinks= 9.6,10.0,10.0,9.0,10.9,8.9,9.5,9.1
High-Caffeine Energy Drinks= 21.0,25.0,15.0,21.5,35.7,15.0,33.3,11.9,16.3,31.3,30.0
I NEED IT BY NEXT TUESDAY THE 29TH BY 11:59PM. THANK YOU SO MUCH.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! #1 Compute the sample mean and Standard Deviation for the data set.
497,193,328,155,326,245,270
I did get the mean part and its 2014/7=287.71 is that right?
That is correct.
-----------------------------------------
i did do the SD part kind of and here what i got for
(497-287.71)^2 =
(193-(287.71^2 =
(328-287.71)^2 =
(155-287.71)^2 =
(326-287.71)^2 =
(245-287.71)^2 =
(270-287.71)^2 =
Add them/ Divide by n-1 = 6 ; take the square root, to get
SD = 112.26
--------------------------------
#2
a) Calculate the median of the data set
480,790,1000+,350,920,860,570,1000+,170,290
Rank:: 170,290,350,480,570,790,860,920,1000+,1000+
Ans: The median is the average of the middle two data values::
Median = (570+790)/2 = 680
-------------------------------------------
b)
Could you accurately calculate the mean for this data set? why or why not?
No because 1000+ is an estimate.
---------------------------------------
#3
Calculate the IQR for this data.
140,195,155,115,195,180,110,110,130,50,60
IQR = Q3-Q1 = 328-193 = 135
--------------------------------------
#4
a) Compute the mean for this data.
17=1,18=8,19=2,20=3,21=3,21=1,23=1,25=1,69=1 all adds to 18/20=0.9 right?
Note:: Something is messed up here.
----------------------------------------------------
b)Compute the median for this data.
--------------------------------
c) Which measure of center is best for this data and why?
497 is an outlier so the mean tends to be skewed upward.
Therefore, use the median as a better estimate of the center.
---------------------------------
#5Compute the sample mean and sample standard deviation for this data.
i got the mean its 532/11=48.36.
That is correct.
Here are the numbers= 62,23,27,56,52,34,42,40,68,45,83 same thing i did as in #1 but i add it and its not zero.
Standard deviation = 18.08
----------------------------
#6 which of the two groups has the most varability with respect to caffeine per ounce? Explain your choice in words and show all math calculations you did to arrive at your decision.
---------------------------------------------------------------------------
Top-Selling Energy Drinks=
9.6,10.0,10.0,9.0,10.9,8.9,9.5,9.1
mean = 9.625
std = 0.6671---
High-Caffeine Energy Drinks= 21.0,25.0,15.0,21.5,35.7,15.0,33.3,11.9,16.3,31.3,30.0
mean = 23.27
std = 8.311
----
The data set with the higher std has the higher spread.
===========================================================
Cheers,
Stan H.
==================
I NEED IT BY NEXT TUESDAY THE 29TH BY 11:59PM. THANK YOU SO MUCH.
|
|
|
