What type of data is the number of 20 year olds considered to be?
quantitative - discrete
On average, a busy emergency room gets a patient with a shotgun wound about once per week. We are interested in the number of patients with a shotgun wound the emergency room gets per 28 days.
Define the random variable
$X$ .
State the distribution for
$X$ .
Find the probability that the emergency room gets no patients with shotgun wounds in the next 28 days.
$P\left(4\right)$
0.0183
The next two questions refer to the following information:
The probability that a certain slot machine will pay back money when a quarter is inserted is 0.30 . Assume that each play of the slot machine is independent from each other. A person puts in 15 quarters for 15 plays.
Is the expected number of plays of the slot machine that will pay back money greater than, less than or the same as the median? Explain your answer.
greater than
Is it likely that exactly 8 of the 15 plays would pay back money? Justify your answer numerically.
No;
$P\left(x=8\right)=0\text{.}\text{0348}$
A game is played with the following rules:
it costs $10 to enter
a fair coin is tossed 4 times
if you do not get 4 heads or 4 tails, you lose your $10
if you get 4 heads or 4 tails, you get back your $10, plus $30 more
Over the long run of playing this game, what are your expected earnings?
You will lose $5
The mean grade on a math exam in Rachel’s class was 74, with a standard deviation of 5. Rachel earned an 80.
The mean grade on a math exam in Becca’s class was 47, with a standard deviation of 2. Becca earned a 51.
The mean grade on a math exam in Matt’s class was 70, with a standard deviation of 8. Matt earned an 83.
Find whose score was the best, compared to his or her own class. Justify your answer numerically.
Becca
The next two questions refer to the following information:
A random sample of 70 compulsive gamblers were asked the number of days they go to casinos per week. The results are given in the following graph:
Find the number of responses that were “5".
14
Find the mean, standard deviation, the median, the first quartile, the third quartile and the IQR.
Sample mean = 3.2
Sample standard deviation = 1.85
Median = 3
Quartile 1 = 2
Quartile 3 = 5
IQR = 3
Based upon research at De Anza College, it is believed that about 19% of the student population speaks a language other than English at home.
Suppose that a study was done this year to see if that percent has decreased. Ninety-eight students were randomly surveyed with the following results. Fourteen said that they speak a language other than English at home.
State an appropriate
null hypothesis.
State an appropriate
alternate hypothesis.
Define the Random Variable,
$\hat{p}$ .
Calculate the test statistic.
Calculate the p-value.
At the 5% level of decision, what is your decision about the null hypothesis?
What is the Type I error?
What is the Type II error?
$z=-1\text{.}\text{19}$
0.1171
Do not reject the null
Assume that you are an emergency paramedic called in to rescue victims of an accident. You need to help a patient who is bleeding profusely. The patient is also considered to be a high risk for contracting AIDS. Assume that the null hypothesis is that the patient does
not have the HIV virus. What is a Type I error?
We conclude that the patient does have the HIV virus when, in fact, the patient does not.
It is often said that Californians are more casual than the rest of Americans. Suppose that a survey was done to see if the proportion of Californian professionals that wear jeans to work is greater than the proportion of non-Californian professionals. Fifty of each was surveyed with the following results. 15 Californians wear jeans to work and 6 non-Californians wear jeans to work.
$C$ = Californian professional
$\text{NC}$ = non-Californian professional
State appropriate
null and
alternate hypotheses.
Define the Random Variable.
Calculate the test statistic and p-value.
At the 5% significance level, what is your decision?
What is the Type I error?
What is the Type II error?
$z=2.21$ ;
$p=0.0136$
Reject the null
We conclude that the proportion of Californian professionals that wear jeans to work is greater than the proportion of non-Californian professionals when, in fact, it is not greater.
We cannot conclude that the proportion of Californian professionals that wear jeans to work is greater than the proportion of non-Californian professionals when, in fact, it is greater.
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest.
Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.?
How this robot is carried to required site of body cell.?
what will be the carrier material and how can be detected that correct delivery of drug is done
Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
how did you get the value of 2000N.What calculations are needed to arrive at it
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Source:
OpenStax, Collaborative statistics using spreadsheets. OpenStax CNX. Jan 05, 2016 Download for free at http://legacy.cnx.org/content/col11521/1.23
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