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 Confidence intervals
 A single population mean using

Card 9 / 21:
Suppose that 14 children, who were learning to ride twowheel bikes, were surveyed to determine how long they had to use training wheels. It was revealed that they used them an average of six months with a sample standard deviation of three months. Assume that the underlying population distribution is normal.
x ¯ = __________ s x = __________ n = __________ n – 1 = __________Define the random variable X in words.Define the random variable X ¯ in words.Which distribution should you use for this problem? Explain your choice.Construct a 99% confidence interval for the population mean length of time using training wheels. State the confidence interval. Sketch the graph. Calculate the error bound.Why would the error bound change if the confidence level were lowered to 90%?

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Questions & Answers
The controls that are usually used are
the controls that are usually used in quality controls and also controls a process is key tool used in run chat, control chat and design of experiment etc.,
Sravanthi
mean is number that occurs frequently in a giving data
That places the mode and the mean as the same thing. I'd define the mean as the ratio of the total sum of variables to the variable count, and it assigns the variables a similar value across the board.
Samsicker
what is normal distribution
What is the uses of sample in real life
pain scales in hospital
Lisa
change of origin and scale
3. If the grades of 40000 students in a course at the Hashemite University are distributed according to N(60,400) Then the number of students with grades less than 75 =*
If a constant value is added to every observation of data, then arithmetic mean is obtained by
data can be defined as numbers in context. suppose you are given the following set of numbers
18,22,22,20,19,21
what is statistics
Natasha
statistics is a combination of collect data summraize data analyiz data and interprete data
Ali
It is the science of analysing numerical data in large quantities, especially for the purpose of inferring proportions in a whole from those in a representative sample.
Bernice
statistics was first used by?
Terseer
if a population has a prevalence of Hypertension 5%, what is the probability of 4 people having hypertension from 8 randomly selected individuals?
Carpet land sales persons average 8000 per weekend sales Steve qantas the firm's vice president proposes a compensation plan with new selling incentives Steve hopes that the results of a trial selling period will enable him to conclude that the compensation plan increases the average sales per sales
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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