Question

The ages of a group of 124 randomly selected adult females have a standard deviation of 18.5 years. Assume that the ages of female statistics students have less variation than ages of females in the general population, so let sigma equals18.5 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 90 % confidence that the sample mean is within one-half year of the population mean.

The required sample size is ____

Answer #1

The ages of a group of 142 randomly selected adult females have
a standard deviation of 18.1 years. Assume that the ages of female
statistics students have less variation than ages of females in the
general population, so let sigma=18.1 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 90% confidence that the
sample mean is within one-half...

The ages of a group of 130 randomly selected adult females have
a standard deviation of 16.2 years. Assume that the ages of female
statistics students have less variation than ages of females in the
general population, so let σ=16.2 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 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 124 randomly selected adult females have
a standard deviation of 17.6 years. Assume that the ages of female
statistics students have less variation than ages of females in the
general population, so let sigmaσequals=17.6 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 99% confidence that the
sample mean is within one-half...

The ages of a group of 131 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 sigmaequals18.9 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 99% confidence that the
sample mean is within one-half...

The ages of a group of 154 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...

Thirty randomly selected student cars have ages with a mean of
7.8years and a standard deviation of 3.4 years, while fifteen
randomly selected faculty cars have ages with a mean of 5.2 years
and a standard deviation of 3.7 years.
1. Use a 0.01 significance level to test the claim that student
cars are older than faculty cars, on average.
(a) State the null and alternative hypotheses. (Type
mu1 for the population mean age of student cars,
and mu2 for...

The pulse rates of 159 randomly selected adult males vary from a
low of 36 bpm to a high of 108 bpm. Find the minimum sample size
required to estimate the mean pulse rate of adult males. Assume
that we want 90% confidence that the sample mean is within 2 bpm
of the population mean. Find the sample size using the range rule
of thumb to estimate sigma.

he pulse rates of 161 randomly selected adult males vary from a
low of 42 bpm to a high of 102 bpm. Find the minimum sample size
required to estimate the mean pulse rate of adult males. Assume
that we want 99% confidence that the sample mean is within 3 bpm
of the population mean. Complete parts (a) through (c) below. a.
Find the sample size using the range rule of thumb to estimate
sigma.

An IQ test is designed so that the mean is 100 and the standard
deviation is 24 for the population of normal adults. Find the
sample size necessary to estimate the mean IQ score of statistics
students such that it can be said with 99% confidence that the
sample mean is within 3 IQ points of the true mean. Assume that
sigma=24 and determine the required sample size using technology.
Then determine if this is a reasonable sample size for...

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