Question
In: Statistics and Probability
In a recent survey, 56% of employed adults reported that basic mathematical skills were critical. A...
In a recent survey, 56% of employed adults reported that basic mathematical skills were critical. A supervisor thinks this percentage has increased due to increased use of technology in the workplace. She takes a random sample of 470 employed adults and finds that 281 of them feel that basic mathematical skills are critical or very important to their job. Test her hypothesis at the α=0.05 level of significance.
What is the test statistics?
What is the critical value?
Estimate the left boundary of a 95% confidence interval of the population proportion.
also if there is any way someone can show me how to do this on a ti-84 calculator, I would appreciate it! Thank you!
Solutions
orchestra answered 2 years agoRelated Solutions
In a recent survey, 56% of employed adults reported that basic mathematical skills were critical. A...
In a recent survey, 56% of employed adults reported that basic
mathematical skills were critical. A supervisor thinks this
percentage has increased due to increased use of technology in the
workplace. She takes a random sample of 470 employed adults and
finds that 281 of them feel that basic mathematical skills are
critical or very important to their job. Test her hypothesis at the
α=0.05 level of significance.
-What is the test statistics?
-What is the critical value?
-Estimate the...
In a recent survey, 34% of employed U.S. adults reported that basic mathematical skills were critical...
In a recent survey, 34% of employed U.S. adults reported that
basic mathematical skills were critical or very important to their
job. The supervisor of the job placement office at a 4-year
college thinks this percentage has increased due to increased use
of technology in the workplace. She takes a random sample of 250
employed adults and finds that 90 of them feel that basic
mathematical skills are critical or very important to their job. Is
there sufficient evidence to...
In August 2003, 56% of employed adults in the United States reported that basic mathematical skills...
In August 2003, 56% of employed adults in the United States
reported that basic mathematical skills were critical or very
important to their job. The supervisor of the job placement office
at a 4-year college thinks this percentage has increased due to
increased use of technology in the workplace. He takes a random
sample of 530 employed adults and finds that 324 of them feel that
basic mathematical skills are critical or very important to their
job. Is there sufficient...
In August 2003, 56% of employed adults in the United States reported that basic mathematical skills...
In August 2003, 56% of employed adults in the United States
reported that basic mathematical skills were critical or very
important to their job. The supervisor of the job placement office
at a 4-year college thinks this percentage has increased due to
increased use of technology in the workplace. He takes a random
sample of 530 employed adults and finds that 324 of them feel that
basic mathematical skills are critical or very important to their
job. Is there sufficient...
In August 2003, 56% of all employed adults in the United States reported that basic mathematical...
In August 2003, 56% of all employed adults in the United States
reported that basic mathematical skills were critical or very
important to their job. A researcher believes that this proportion
has increased, so a random sample of 480 employed adults was taken
and 297 of them felt that basic mathematical skills are critical or
very important to their job.
Be sure to check if the conditions are met, and show how
you checked them - show ALL work.
1a)...
A recent CBS News survey reported that 69% of adults felt the U.S. Treasury should continue...
A
recent CBS News survey reported that 69% of adults felt the U.S.
Treasury should continue making pennies.
Suppose we select a sample of 14 adults.
How many of the 14 would we expect to indicate that the
Treasury should continue making pennies? (round your answer to 2
decimal places)
What is the standard deviation? (round your answer to 4
decimal places)
What is the likelihood that exactly 8 adults would indicate
the Treasury should continue making pennies? (round your...
In a recent national survey, 30 Canadian adults aged 18-24 reported having used cannabis for the...
In a recent national survey, 30 Canadian adults aged 18-24
reported having used cannabis for the first time since its
legalisation in 2018 compared to 68 among the 25-44-year-olds. Out
of the 1500 survey respondents, 125 were 18-24-year-olds and 400
were in the 25-44 age group. The Public Health Agency has been
concerned that the first time use of cannabis among the younger
cohort is higher than that among the older cohort.
a) Formulate the appropriate statistical hypotheses to test...
As part of a recent? survey, self-reported? heights, x, and measured? heights, y, were obtained for...
As part of a recent? survey, self-reported? heights, x, and
measured? heights, y, were obtained for males aged 12?16. Use the
Wilcoxon? signed-ranks test to test the claim that the matched
pairs have differences that come from a population with median
equal to zero at a significance level of alpha equals 0.1. Find the
null and alternate hypothesis, test statistic, critival value and
state the conclusion.
x
y
67
68.6
61
63
68
61.1
67
61
64
67.7
64
68.3...
A recent study found that the average credit score for employed American adults is 702.5. A...
A recent study found that the average credit score for employed
American adults is 702.5. A credit analyst wonders if this number
is actually different for working millenials. In a random sample of
15 employed millenials, their sample mean credit score was 715.2
with a sample standard deviation of 83. Assume that credit scores
of the population are normally distributed.
(a) Conduct the appropriate test to determine if millenials have
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In 2003 a survey of 35,000 adults showed that 26% were smokers. In 2010 a survey...
In 2003 a survey of 35,000 adults showed that 26% were smokers.
In 2010 a survey of 45,000 adults showed that 21% were smokers.
Construct a 95% confidence interval for the true difference between
proportions.
a) (4.41% , 5.59%)
b) (3.33% , 6.67%)
c) (4.82% , 5.18%)
d) (3.83% , 6.17%)
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