Question

Five years? ago, 10.3?% of high school students had tried marijuana for the first time before the age of 13. A school resource officer? (SRO) thinks that the proportion of high school students who have tried marijuana for the first time before the age of 13 has increased since then. ?(a) Determine the null and alternative hypotheses. Which of the following is? correct? A. Upper H 0?: pequals0.103?; Upper H 1?: pgreater than0.103 B. Upper H 0?: pequals0.103?; Upper H 1?: pnot equals0.103 C. Upper H 0?: pequals0.103?; Upper H 1?: pless than0.103 ?(b) Suppose sample data indicate that the null hypothesis should not be rejected. State the conclusion of the researcher. A. There is sufficient evidence to conclude that the proportion of high school students has increased. B. There is not sufficient evidence to conclude that the proportion of high school students has stayed the same. C. There is not sufficient evidence to conclude that the proportion of high school students has increased. D. There is sufficient evidence to conclude that the proportion of high school students has stayed the same. ?(c) Suppose, in? fact, that the proportion of high school students who have tried marijuana before the age of 13 was 10.5?%. Was a type I or type II error? committed? A. The SRO committed a type II error because he accepted the null hypothesis when the alternative hypothesis is true. B. The SRO committed a type II error because he did not reject the null hypothesis when the alternative hypothesis is true. C. The SRO committed a type Upper I error because he did not reject the null hypothesis when the alternative hypothesis is true. D. The SRO committed a type Upper I error because he accepted the null hypothesis when the alternative hypothesis is true

Answer #1

(A)

Since we wnat to test whether the proportion of high school students who have tried marijuana for the first time before the age of 13 has increased from 10.3%. The alternative hypothesis is:

The null hypothesis is:

(b)

Since null hypothesis is not rejected so

C. There is not sufficient evidence to conclude that the proportion of high school students has increased.

(c)

Since true proportion is 10.5% but we fail to reject the null hypothesis so we fail to reject the false null hypothesis. So type II error is possible.

B. The SRO committed a type II error because he did not reject the null hypothesis when the alternative hypothesis is true.

Large Sample Proportion Problem. A survey was
conducted on high school marijuana use. Of the 2266 high school
students surveyed, 970 admitted to smoking marijuana at least
once. A study done 10 years earlier estimated that 45%
of the students had tried marijuana. We want to conduct a
hypothesis test to see if the true proportion of high school
students who tried marijuana is now less than 45%. Use
alpha = .01.
What is the conclusion for this test?
Group of...

Twenty years ago, 49% of parents of children in high school
felt it was a serious problem that high school students were not
being taught enough math and science. A recent survey found that
247 of 800 parents of children in high school felt it was a serious
problem that high school students were not being taught enough math
and science. Do parents feel differently today than they did twenty
years ago? Use the alpha equals 0.1 level of significance....

Large Sample Proportion Problem. A survey was
conducted on high school marijuana use. Of the 2266 high school
students surveyed, 970 admitted to smoking marijuana at least
once. A study done 10 years earlier estimated that 45%
of the students had tried marijuana. We want to conduct a
hypothesis test to see if the true proportion of high school
students who tried marijuana is now less than 45%. Use
alpha = .01.
What is the critical value for this test?

E-Cigs According to the Centers for Disease Control and
Prevention, 2.8% of high school students currently use electronic
cigarettes. A high school counselor is concerned the use of e-cigs
at her school is higher.
(a) Determine the null and alternative hypotheses.
(b) If the sample data indicate that the null hypothesis should
not be rejected, state the conclusion of the school counselor.
(c) Suppose, in fact, that the proportion of students at the
counselor’s high school who use electronic cigarettes...

Five years ago, the average math SAT score for students at one
school was 475. A teacher wants to perform a hypothesis test to
determine whether the mean math SAT score of students at the school
has improved. The mean math SAT score for a random sample of 40
students from this school is 469 with a standard deviation of 73.
Do the data provide sufficient evidence to conclude that the mean
math SAT score for students at the school...

In a survey of
one hundred and eight five
females who recently completed high school,
eighty percent
were enrolled in college. In a survey of
one hundred and fifty
males who recently completed high school,
sixty eight percent
were enrolled in college. At
α=0.07,
can you reject the claim that there is no difference in the
proportion of college enrollees between the two groups? Assume the
random samples are independent. Complete parts (a) through
(e).
(a) Identify the claim and...

A study investigated whether regular mammograms resulted in
fewer deaths from breast cancer over a period of 15 years. Among
30,579 women who never had mammograms, 191 died of breast cancer,
while only 141 of 30,152 who had undergone screening died of breast
cancer. a) Do these results suggest that mammograms may be an
effective screening tool to reduce breast cancer deaths? b) If
your conclusion is incorrect, which type of error did you
commit?
Determine the test statistic.
z=...

#22 Several years ago, 39% of parents who had children in
grades K-12 were satisfied with the quality of education the
students receive. A recent poll asked 1 comma 115 parents who have
children in grades K-12 if they were satisfied with the quality of
education the students receive. Of the 1 comma 115 surveyed, 498
indicated that they were satisfied. Construct a 90% confidence
interval to assess whether this represents evidence that parents'
attitudes toward the quality of education...

32. Suppose a survey is conducted five years ago at a university
showed that there are 500 students out of all the 5000 students
would like to go graduate school after they obtained the bachelor’s
degree. This year a new survey was conducted on a random sample of
500 students from this university, and it was found that 80 of them
would like to go graduate school after they graduate. Do these data
provide convincing evidence to suggest that the...

(1 point) A report says that 82% of British Columbians over the
age of 25 are high school graduates. A survey of randomly selected
British Columbians included 1290 who were over the age of 25, and
1135 of them were high school graduates. Does the cityâs survey
result provide sufficient evidence to contradict the reported
value, 82%?
Part i) What is the parameter of
interest?
A. Whether a British Columbian is a high school
graduate.
B. The proportion of 1290...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 33 minutes ago

asked 37 minutes ago

asked 39 minutes ago

asked 40 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago