




Card 13 / 21:
In a recent sample of 84 used car sales costs, the sample mean was $6,425 with a standard deviation of $3,156. Assume the underlying distribution is approximately normal.
Which distribution should you use for this problem? Explain your choice.Define the random variable X ¯ in words.Construct a 95% confidence interval for the population mean cost of a used car. State the confidence interval. Sketch the graph. Calculate the error bound.Explain what a “95% confidence interval” means for this study.

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Questions & Answers
What is the variances of 568
what variance would have a single value..?
friend
variance happened only in a group of values..
friend
if we have a group of values...1st we find its average..ie..'mean'..then we calculate each value's difeerence from the mean..then we will square each 'difference value'.then we devide total of sqared value by n or n1..that is what variance...
friend
What is the variances of 258
what is the sample size if the degree of freedom is 25?
degrees of freedom may differ with respect to distribution...so tell which distribution you have selected...?
friend
my distribution is 27
Tariku
how to understand statistics
you are working for a bank.The bank manager wants to know the mean waiting time for all customers who visit this bank. she has asked you to estimate this mean by taking a sample . Briefly explain how you will conduct this study. assume the data set on waiting times for 10 customers who visit a bank. Then estimate the population mean. choose your own confidence level.
what marriage for 10 years
fit a least square model of y on x ? what is the regression coefficient ? x : 2 3 6 8 9 10 y : 5 6 7 10 8 11
how can we find the expectation of any function of X?
Jennifer
I've been using this app for some time now. I'm taking a stats class in college in spring and I still have no idea what's going on. I'm also 55 yrs old. Is there another app for people like me?
Tamala
yes I am. it's been decades since I've been in school.
Tamala
is there a private chat we can do
Tamala
hello
how can I get PDF of solutions introduction mathematical statistics ( fourth education)
who can help me
ahssal
simply probability means possibility..
definition:Probability is a measure of the likelihood of an event to occur.
laraib
fit a least square model of y on x ? what is the regression coefficient ? x : 2 3 6 8 9 10 y : 5 6 7 10 8 11
Nayab
classification of data by attributes is called
qualitative classification
talal
tell me details about measure of Dispersion
Halim
Following data provided
Class
Frequency
less than 10 1020
5
15
1030
25
12
40 and above
Which measure of central tendency would you compute and
why?
a box contains a few red and a few blue balls.one ball is drawn randomly find the probability of getting a red ball if we know that there are 30 red and 40 blue balls in the box
Total=30+40=70
P(red balls) =30/70
Therefore the answer is 3/7
Anuforo
define transport statistical unit
describe each transport statistical unit
Dennis
explain uses of each transport statistical unit
Dennis
identify various transport statistical units with their example
Dennis
I didn't understand about Chi square.
explain the concept of data analysis and data processing
the following data represent the number of pop up advertisement received by 10 families during the past month.calculate the mean number of advertisement received by each family during month.43,37,35,30,41,23,33,31,16,21
mean=43+37+35+30+41+23+33+31+16/10
=310/10
=31
Anuforo
43+37+35+30+41+23+33+31+16 divided by 10
=310/10
=31
Anuforo
Source:
OpenStax, Introductory statistics. OpenStax CNX. May 06, 2016 Download for free at http://legacy.cnx.org/content/col11562/1.18
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