Question
In: Statistics and Probability
A group of 50 randomly selected students have a mean score of 30.8 with a standard...
A group of 50 randomly selected students have a mean score of 30.8 with a standard deviation of 3.5 on a placement test. Is their statistically significant evidence, at a 1% significance level, to say that the true mean score is greater than 30?
Solutions
orchestra answered 2 years agoRelated Solutions
A group of 59 randomly selected students have a mean score of 29.5 with a standard...
A group of 59 randomly selected students have a mean score of
29.5 with a standard deviation of 5.2 on a placement test. What is
the 90% confidence interval for the mean score, μ, of all students
taking the test. Show Work
A group of 76 randomly selected students have a mean score of 29.5 with a standard...
A group of 76 randomly selected students have a mean score of
29.5 with a standard deviation of 5.2 on a placement test.
Construct and interpret a 99% confidence interval for the mean
score, μ, of all students taking the test.
A group of 76 randomly selected students have a mean score of 29.5 with a standard...
A group of 76 randomly selected students have a mean score of
29.5 with a standard deviation of 5.2 on a placement test.
Construct and interpret a 95% confidence interval for the mean
score, μ, of all students taking the test. Construct and
interpret a 95% confidence interval for the mean score, μ,
of all students taking the test.
1. You have sampled 25 randomly selected students to find the mean test score. A 95%...
1. You have sampled 25 randomly selected students to find the
mean test score. A 95% confidence interval for the mean came out to
be between 85 and 92. Which of the following statements gives a
valid interpretation of this interval?
1)If this procedure were to be repeated many times, 95% of the
confidence intervals found would contain the true mean score.
2)If 100 samples were taken and a 95% confidence interval were
found, 95 of them would be between...
Thirty randomly selected students took the calculus final. If the sample mean score was 79 and...
Thirty randomly selected students took the calculus final. If
the sample mean score was 79 and the standard deviation was
7 , find the
99% confidence interval for the mean score of all students. Assume
the population is normally distributed and round to two decimal
places.
The ages of a group of 135 randomly selected adult females have a standard deviation of...
The ages of a group of 135 randomly selected adult females have
a standard deviation of 17.9 years. Assume that the ages of female
statistics students have less variation than ages of females in the
general population, so let sigmaequals17.9 years for the sample
size calculation. How many female statistics student ages must be
obtained in order to estimate the mean age of all female
statistics students? Assume that we want 95% confidence that the
sample mean is within one-half...
The ages of a group of 141 randomly selected adult females have a standard deviation of...
The ages of a group of 141 randomly selected adult females have
a standard deviation of 18.9 years. Assume that the ages of female
statistics students have less variation than ages of females in the
general population, so let σ=18.9years for the sample size
calculation. How many female statistics student ages must be
obtained in order to estimate the mean age of all female
statistics students? Assume that we want
95% confidence that the sample mean is within one-half year...
assume that IQ score are randomly distributed with a mean of 100 and a standard deviation...
assume that IQ score are randomly distributed with a
mean of 100 and a standard deviation of 15 . if 49 are randomly
find the probability that their mean IQ score is greater than
98
Randomly selected 8080 student cars have ages with a mean of 88 years and a standard...
Randomly selected 8080 student cars have ages with a mean of 88
years and a standard deviation of 3.6 years, while randomly
selected 9595 faculty cars have ages with a mean of 5.4 years and a
standard deviation of 3.7 years.
1. Use a 0.03 significance level to test the
claim that student cars are older than faculty cars.
The test statistic is
The critical value is
Is there sufficient evidence to support the claim that student cars
are older than...
Randomly selected 2929 student cars have ages with a mean of 77 years and a standard...
Randomly selected 2929
student cars have ages with a mean of 77 years and a standard
deviation of 3.43.4 years, while randomly selected 1515 faculty
cars have ages with a mean of 5.95.9 years and a standard deviation
of 3.73.7 years.
1. Use a 0.010.01 significance level to test the claim that student
cars are older than faculty cars.
(a) The null hypothesis is
H0:μs=μfH0:μs=μf. What
is the alternate hypothesis?
A.
HA:μs<μfHA:μs<μf
B.
HA:μs≠μfHA:μs≠μf
C.
HA:μs>μfHA:μs>μf
(b) The test statistic...
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