Question

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 year of the population mean. Does
it seem reasonable to assume that the ages of female statistics
students have less variation than ages of females in the general
population?

The required sample size is _____?

Answer #1

**Answer:**

**Given that:**

**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**

Standard deviation () = 18.1

Margion of error (E) = 0.5 yr

90% confidence interval

Critical value

Sample size

Sample size (n) = 3547

Yes.it seems reasonable to assume that the ages of female statistics student have less variation than ages of females in the general population

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 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...

An IQ test is designed so that the mean is 100 and the standard
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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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sample size necessary to estimate the mean IQ score of statistics
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sigma σ equals=16 and determine the required sample size using
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The recommended dietary allowance (RDA) of iron for adult
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indicate that applying the z-test is reasonable. note (sample
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state the hypothesis for one-mean z...

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The percentage of individual adult females with weights less
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Assume that females have pulse rates that are normally
distributed with a mean of mu equals 72.0μ=72.0 beats per minute
and a standard deviation of sigma equals 12.5σ=12.5 beats per
minute. Complete parts (a) through (c) below.
a. If 1 adult female is randomly selected, find the probability
that her pulse rate is less than 76 beats per minute.
The probability is ?.
(Round to four decimal places as needed.)
b. If 4 adult females are randomly selected, find the...

Assume that females have pulse rates that are normally
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beats per minute. The probability is nothing. (Round to four
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