Question

A study compared the drug use of 288 randomly selected high school seniors exposed to a drug education program (DARE) and 335 randomly selected high school seniors who were not exposed to such a program. Data for marijuana use are given in the accompanying table. sample size number who use marijuana exposed to DARE 288 138 not exposed to DARE 335 181

At the 5% significance level, is there convincing evidence that the proportion using marijuana is lower for students exposed to the DARE program?

Round these answers to two places after the decimal: Test-statistic =

P-value = (to four places after the decimal)

There is not sufficient evidence to conclude that the proportion of students using marijuana is lower for students exposed to the DARE program.

Answer #1

There is **not sufficient evidence** to conclude that
the proportion of students using marijuana is lower for students
exposed to the DARE program, since p-value is greater than the 0.05
significance level.

10) The SAT scores for 12 randomly selected seniors at a
particular high school are given below. Assume that the SAT scores
for seniors at this high school are normally distributed.
867
1,234
894
1,264
614
861
1,382
968
824
944
702
1,360
a) Find a 95% confidence interval for the true mean SAT score
for students at this high school.
b) Provide the margin of error of the interval
as your answer.
Round your answer to the nearest whole...

10) The SAT scores for 12 randomly selected seniors at a
particular high school are given below. Assume that the SAT scores
for seniors at this high school are normally distributed.
1,099
678
690
873
721
651
689
790
1,150
754
709
686
a) Find a 95% confidence interval for the true mean SAT score
for students at this high school.
b) Provide the margin of error of the interval
as your answer.
Round your answer to the nearest whole...

9)
The SAT scores for 12 randomly selected seniors at a particular
high school are given below. Assume that the SAT scores for seniors
at this high school are normally distributed.
804
1,181
1,255
1,039
930
1,307
1,312
610
967
1,051
1,184
1,315
a) Find a 95% confidence interval for the true mean SAT score
for students at this high school.
b) Provide the right endpoint of the interval
as your answer.
Round your answer to the nearest whole
number.

9)
The SAT scores for 12 randomly selected seniors at a particular
high school are given below. Assume that the SAT scores for seniors
at this high school are normally distributed.
1,062
1,057
1,363
1,042
813
833
902
1,136
617
1,040
1,111
1,080
a) Find a 95% confidence interval for the true mean SAT score
for students at this high school.
b) Provide the right endpoint of the interval
as your answer.
Round your answer to the nearest whole
number.

The state test scores for
12
randomly selected high school seniors are shown on the right.
Complete parts (a) through (c) below.
Assume the
The
state test scores for
1212
randomly selected high school seniors are shown on the right.
Complete parts (a) through (c) below.
Assume the population is normally distributed.
1430
1228
988
695
724724
830
722
750750
546
627
1447
943
the state test scores for
12
randomly selected high school seniors are shown on the right....

31)
The SAT scores for 12 randomly selected seniors at a particular
high school are given below. Assume that the SAT scores for seniors
at this high school are normally distributed.
928
743
1,329
920
827
927
1,250
1,339
1,392
955
934
1,024
a) Find a 95% confidence interval for the true mean SAT score
for students at this high school.
b) Provide the right endpoint of the interval
as your answer.
Round your answer to the nearest whole
number....

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?

The state test scores for 12 randomly selected high school
seniors are shown on the right. Complete parts (a) through (c)
below. Assume the population is normally distributed. 1429 1223 983
699 720 836 724 744 543 630 1441 949. Construct a 95% confidence
interval for the population mean μ. (round to one decimal place as
needed)

1. a) Time Magazine states that the drop out rate for high
school seniors is ten percent. You conduct a test to see if the
drop out rate for high school seniors is actually more than ten
percent. One hundred high school seniors were randomly
selected to see if they had dropped out. The number of
these high school seniors who dropped out is 15. Determine the
p-value using test statistic, z=1.67. Draw the graph. (α
=0.01)
b) Time Magazine states that the...

The state test scores for 12 randomly selected high school
seniors are shown on the right. Complete parts (a) through (c)
below.
Assume the population is normally distributed.
1430
1223
985
691
727
833
725
748
540
624
1448
949
(a) Find the sample mean.
x= _ (Round to one decimal place as needed.)
(b) Find the sample standard deviation.
s= _ (Round to one decimal place as needed.)(c)
Construct a 99% confidence interval for the population mean is
(...

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