




Card 18 / 20:
The average height of young adult males has a normal distribution with standard deviation of 2.5 inches. You want to estimate the mean height of students at your college or university to within one inch with 93% confidence. How many male students must you measure?
Use the formula for EBM , solved for n : n = z 2 σ 2 E B M 2

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Questions & Answers
How do you get log of normal population
plz give me answer of this question
show that mean of population or sampling distribution are equally
Mari
what is the probability of getting no head face up in three tosses of a fair coin?
In how many ways can probability be assigned to an event of interest?
Epara
Hey guys can someone help me with combinations and permutations
Lion
Phone lines on an airline system are occupied 50% of time assume that 10 calls are placed to the airline. What is the probability at least 1 call the lines are occupied?
Phone lines on an airline system are occupied 50% of time assume that 10 calls are placed to the airline. What is the probability at least 1 call the lines are occupied?
Why is the method of selecting the sample even more important than the size of the sample?
formulaas for gruoped and ungrouped of quartiles
Why is the method of selecting the sample even more important than the size of the sample?
Nana
una empresa productora que participa en el mercado de lapices tiene la siguente funcion de demanda
Qd=a la raiz de 9 9p
si la elasticidad precio de demanda de la empresa es epd=0,5
determinar
a) hallar el precio y cantidad
find the mean mew and the standard devation sigma of the given population 9.8,10.2,10.4,9.8,10.0,10.2,9.6
1. A card is drawn at random from an ordinary deck of 52 playing cards.*
*Find the probability that it is*
(a). an ace
(b). a jack of hearts
(c). a three of clubs or a six of diamonds
(d). a heart
(e). any suit except hearts
(f). a ten or a spade
(g). neither a four nor a club.
*Hint:* 1st determine how many of the following is in a deck of cards.
A deck of cards have 52 cards
♠️ Club
♣️  Spade
♥️  Heart
♦️ Diamond
a measure of central tendency is a typical value around which other figures congregate
hmm mean mode median
Umar
Y = alpha0 + alpha1X1 + E what is this equation
An estimated linear regression equation
Carlos
simple linear regression ..
where Alpho zero is reg constant ( intercept of the reg line)
and Alpha1 is the regression coefficient ( slope of the regression line)
Umar
null and altarnate hypothesis are the statement about
about any population of interest
Umar
I said we give hypothesis about any population and mean , in null hyp we say sample mean is equal to the population mean where as in alternate hyp we say sample mean is not equal to the pop mean ..
to test these things
we use students test statistics commonly
Umar
probability of getting one black card
from a standard deck?
Umar
coz there are 26 blacks card out of 52 in a deck
Umar
so prob of getting a black card out of the deck = 26/52 = 1/5 =0.5
Umar
when are not two events mutually exclusive?
1) they overlap in a venn diagram
2) Probability of one affects the other
A stenographer claims that she can take dictation at the rate of 120 words per minute can we reject her claim on the basis of 100 trails in which she demonstrates a mean of 116 words with a variance of 225 words
the hypothesis to be tested is the claim to be tested
smita
H0= 120,Ha not equal to 120
x bar =116,s=225,n=100
smita
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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