Question

Use the given information to find the number of degrees of freedom, the critical values chi Subscript Upper L Superscript 2 and chi Subscript Upper R Superscript 2, and the confidence interval estimate of sigma. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. Platelet Counts of Women 99% confidence; nequals23, sequals65.4.

Answer #1

Solution:

n=23

s=65.4

confidence level=0.99

alpha=0.01

alpha/2=0.01/2=0.005

1-alpha/2=1-0.005=0.995

df = n- 1=23-1=22

99% confidence interval for standard deviation is

sqrt(n*s^2/chisqupper<sigma<sqrt(n*s^2/chisqlower)

chisqupper in excel

=CHIINV(0.005,22)

= 42.79565

chilower in excel is

=CHIINV(0.995,22)

= 8.642716

99% confidence interval for standard deviation is

sqrt{(23-1)*65.4^2/42.79565)<sigma<sqrt{(23-1)*65.4^2/8.642716)

46.891<sigma<104.343

99% lower limit for standard deviation is 46.891

99% upper limit for standard deviation is 104.343

Use the given information to find the number of degrees of
freedom, the critical values chi Subscript Upper L Superscript 2
and chi Subscript Upper R Superscript 2, and the confidence
interval estimate of sigma. It is reasonable to assume that a
simple random sample has been selected from a population with a
normal distribution.
Platelet Counts of Women 99% confidence; nequals23,
sequals65.1.

Use the given information to find the number of degrees of
freedom, the critical values chi Subscript Upper L Superscript 2
and chi Subscript Upper R Superscript 2 , and the confidence
interval estimate of sigma . It is reasonable to assume that a
simple random sample has been selected from a population with a
normal distribution.
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65.9.
df =
χ2L (chi Subscript Upper L Superscript 2) =
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interval estimate of sigma. It is reasonable to assume that a
simple random sample has been selected from a population with a
normal distribution. Platelet Counts of Women 95% confidence;
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freedom, the critical values chi Subscript Upper L Superscript 2
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chi Subscript Upper L Superscript 2χ2L
and
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and the confidence interval estimate of
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It is reasonable to assume that a simple random sample has been
selected from a population with a normal distribution.
Platelet Counts of Women
99%
confidence;
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freedom, the critical values chi Subscript Upper L Superscript 2
and chi Subscript Upper R Superscript 2, and the confidence
interval estimate of sigma. It is reasonable to assume that a
simple random sample has been selected from a population with a
normal distribution.
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Use the given information to find the number of degrees of
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Use the given information to find the number of degrees of?
freedom, the critical values chi Subscript Upper L Superscript 2
and chi Subscript Upper R Superscript 2?, and the confidence
interval estimate of sigma. It is reasonable to assume that a
simple random sample has been selected from a population with a
normal distribution. Nicotine in menthol cigarettes 99?%
?confidence; nequals30?, sequals0.24 mg. LOADING... Click the icon
to view the table of? Chi-Square critical values. dfequals nothing
?(Type a...

Use the given information to find the number of degrees of
freedom, the critical values chi Subscript Upper L Superscript 2
and chi Subscript Upper R Superscript 2, and the confidence
interval estimate of sigma. It is reasonable to assume that a
simple random sample has been selected from a population with a
normal distribution. Nicotine in menthol cigarettes 98%
confidence; nequals21, sequals0.28 mg. LOADING... Click the icon
to view the table of Chi-Square critical values. dfequals nothing
(Type a...

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freedom, the critical values chi Subscript Upper L Superscript 2
χ2L and chi Subscript Upper R Superscript 2 χ2R , and the
confidence interval estimate of sigma σ. It is reasonable to assume
that a simple random sample has been selected from a population
with a normal distribution. Nicotine in menthol cigarettes 95 95 %
confidence; n equals = 25 25 , s equals = 0.28 0.28 mg.

Use the given information to find the number of degrees of
freedom, the critical values chi Subscript Upper L Superscript 2
and chi Subscript Upper R Superscript 2, and the confidence
interval estimate of sigma. It is reasonable to assume that a
simple random sample has been selected from a population with a
normal distribution. Nicotine in menthol cigarettes 99%
confidence; n = 29, s = 0.29 mg.
df = ?
(Type a whole number.)
2χ2L = ?
(Round to...

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